/* Professional Portfolio Styles */
/* Design System: Corporate Professional */

/* CSS Variables - Theme System */
:root {
    /* Light Theme - Warm & Elegant Professional Palette */
    --light-bg-primary: #FDFBF8;
    --light-bg-secondary: #FAF7F2;
    --light-text-primary: #1C1917;
    --light-text-secondary: #57534E;
    --light-text-tertiary: #78716C;
    --light-border-color: #D6D3D1;
    --light-bg-alt: #F5F5F4;
    --light-bg-hover: #E7E5E4;
    --light-bg-card: #FFFBF7;
    --light-shadow-sm: 0 1px 3px rgba(28, 25, 23, 0.08);
    --light-shadow-md: 0 4px 12px rgba(28, 25, 23, 0.12);
    --light-shadow-lg: 0 10px 25px rgba(28, 25, 23, 0.15);
    --light-shadow-xl: 0 20px 40px rgba(28, 25, 23, 0.2);
    --light-gradient-hero: linear-gradient(135deg, #FDFBF8 0%, #FAF7F2 50%, #F5F5F4 100%);
    --light-gradient-section: linear-gradient(180deg, #FDFBF8 0%, #FAF7F2 100%);
    --light-navbar-bg: rgba(255, 255, 255, 0.95);
    --light-photo-border: rgba(255, 251, 247, 0.9);
    --light-social-bg: #2D3748;
    --light-social-border: #4A5568;
    --light-social-hover-bg: #1A202C;
    --light-social-hover-border: #718096;
    --light-social-shadow: 0 2px 8px rgba(45, 55, 72, 0.3);
    --light-social-hover-shadow: 0 4px 12px rgba(45, 55, 72, 0.5);

    /* Dark Theme - Dark Old Money Professional Palette */
    --dark-bg-primary: #0F0D0C;
    --dark-bg-secondary: #1C1917;
    --dark-text-primary: #F5F5F4;
    --dark-text-secondary: #A8A29E;
    --dark-text-tertiary: #78716C;
    --dark-border-color: #3F3F46;
    --dark-bg-alt: #27272A;
    --dark-bg-hover: #3F3F46;
    --dark-bg-card: #1C1917;
    --dark-shadow-sm: 0 1px 3px rgba(255, 255, 255, 0.08);
    --dark-shadow-md: 0 4px 12px rgba(255, 255, 255, 0.12);
    --dark-shadow-lg: 0 10px 25px rgba(255, 255, 255, 0.15);
    --dark-shadow-xl: 0 20px 40px rgba(255, 255, 255, 0.2);
    --dark-gradient-hero: linear-gradient(135deg, #0F0D0C 0%, #1C1917 50%, #27272A 100%);
    --dark-gradient-section: linear-gradient(180deg, #0F0D0C 0%, #1C1917 100%);
    --dark-navbar-bg: rgba(15, 13, 12, 0.95);
    --dark-photo-border: rgba(15, 13, 12, 0.9);
    --dark-social-bg: #374151;
    --dark-social-border: #4B5563;
    --dark-social-hover-bg: #1F2937;
    --dark-social-hover-border: #9CA3AF;
    --dark-social-shadow: 0 2px 8px rgba(255, 255, 255, 0.1);
    --dark-social-hover-shadow: 0 4px 12px rgba(255, 255, 255, 0.2);

    /* Accent Colors - Warm Gold & Amber (Same for both themes) */
    --accent-primary: #D97706;
    --accent-primary-light: #F59E0B;
    --accent-primary-dark: #B45309;
    --accent-secondary: #C2410C;
    --accent-success: #059669;
    --accent-warning: #D97706;
    --accent-error: #DC2626;

    /* Category Badge Colors - Warm Palette (Same for both themes) */
    --badge-data-analysis: #D97706;
    --badge-data-science: #C2410C;
    --badge-data-engineering: #059669;
    --badge-llm: #EA580C;
    --badge-business-analytics: #B45309;

    /* Gradient Colors - Warm & Elegant (Same for both themes) */
    --gradient-primary: linear-gradient(135deg, #D97706 0%, #F59E0B 100%);
    --gradient-accent: linear-gradient(135deg, #D97706 0%, #C2410C 100%);

    /* Spacing (Same for both themes) */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Typography (Same for both themes) */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Border Radius (Same for both themes) */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;

    /* Default to dark theme */
    --bg-primary: var(--dark-bg-primary);
    --bg-secondary: var(--dark-bg-secondary);
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --text-tertiary: var(--dark-text-tertiary);
    --border-color: var(--dark-border-color);
    --bg-alt: var(--dark-bg-alt);
    --bg-hover: var(--dark-bg-hover);
    --bg-card: var(--dark-bg-card);
    --shadow-sm: var(--dark-shadow-sm);
    --shadow-md: var(--dark-shadow-md);
    --shadow-lg: var(--dark-shadow-lg);
    --shadow-xl: var(--dark-shadow-xl);
    --gradient-hero: var(--dark-gradient-hero);
    --gradient-section: var(--dark-gradient-section);
    --navbar-bg: var(--dark-navbar-bg);
    --photo-border: var(--dark-photo-border);
    --social-bg: var(--dark-social-bg);
    --social-border: var(--dark-social-border);
    --social-hover-bg: var(--dark-social-hover-bg);
    --social-hover-border: var(--dark-social-hover-border);
    --social-shadow: var(--dark-social-shadow);
    --social-hover-shadow: var(--dark-social-hover-shadow);
}

/* Light theme variables */
:root[data-theme="light"] {
    --bg-primary: var(--light-bg-primary);
    --bg-secondary: var(--light-bg-secondary);
    --text-primary: var(--light-text-primary);
    --text-secondary: var(--light-text-secondary);
    --text-tertiary: var(--light-text-tertiary);
    --border-color: var(--light-border-color);
    --bg-alt: var(--light-bg-alt);
    --bg-hover: var(--light-bg-hover);
    --bg-card: var(--light-bg-card);
    --shadow-sm: var(--light-shadow-sm);
    --shadow-md: var(--light-shadow-md);
    --shadow-lg: var(--light-shadow-lg);
    --shadow-xl: var(--light-shadow-xl);
    --gradient-hero: var(--light-gradient-hero);
    --gradient-section: var(--light-gradient-section);
    --navbar-bg: var(--light-navbar-bg);
    --photo-border: var(--light-photo-border);
    --social-bg: var(--light-social-bg);
    --social-border: var(--light-social-border);
    --social-hover-bg: var(--light-social-hover-bg);
    --social-hover-border: var(--light-social-hover-border);
    --social-shadow: var(--light-social-shadow);
    --social-hover-shadow: var(--light-social-hover-shadow);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    background-image:
        radial-gradient(at 0% 0%, rgba(217, 119, 6, 0.04) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(194, 65, 12, 0.03) 0px, transparent 50%);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--navbar-bg);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    padding: var(--spacing-md) 0;
    transition: box-shadow 0.3s ease, background 0.3s ease;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.logo {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.nav-home {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
    font-size: 0.9375rem;
    transition: color 0.2s ease;
    position: relative;
}

.nav-home:hover {
    color: var(--accent-primary);
    font-weight: var(--font-weight-semibold);
}

.nav-home::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-primary);
    transition: width 0.3s ease;
}

.nav-home:hover::after {
    width: 100%;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
    font-size: 0.9375rem;
    transition: color 0.2s ease;
    position: relative;
}

.nav-links a:hover {
    color: var(--accent-primary);
    font-weight: var(--font-weight-semibold);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-primary);
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

/* Dropdown Menu */
.nav-dropdown {
    position: relative;
}

.dropdown-toggle {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.dropdown-arrow {
    font-size: 0.7rem;
    transition: transform 0.3s ease;
}

.nav-dropdown.active .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    list-style: none;
    padding: var(--spacing-xs) 0;
    min-width: 160px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(-10px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    z-index: 1000;
}

.nav-dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.dropdown-menu a:hover {
    background-color: var(--bg-hover);
    color: var(--accent-primary);
}

.dropdown-menu a::after {
    display: none;
}


/* Nested Dropdown Styles */
.nav-dropdown-sub {
    position: relative;
}

.dropdown-sub-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.dropdown-sub-menu {
    position: absolute;
    top: 0;
    left: calc(100% + 0.5rem);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    list-style: none;
    padding: var(--spacing-xs) 0;
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-10px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    z-index: 1000;
}

.nav-dropdown-sub:hover .dropdown-sub-menu,
.nav-dropdown-sub.active .dropdown-sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.nav-dropdown-sub:hover .dropdown-sub-toggle .dropdown-arrow,
    .nav-dropdown-sub.active .dropdown-sub-toggle .dropdown-arrow {
        transform: rotate(90deg);
    }


.dropdown-sub-menu li {
    margin: 0;
}

.dropdown-sub-menu a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.dropdown-sub-menu a:hover {
    background-color: var(--bg-hover);
    color: var(--accent-primary);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    padding-bottom: var(--spacing-3xl);
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(217, 119, 6, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(194, 65, 12, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(217, 119, 6, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-image-placeholder {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 1;
}

.photo-placeholder {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 4rem;
    font-weight: var(--font-weight-bold);
    box-shadow:
        0 20px 40px rgba(217, 119, 6, 0.25),
        0 0 0 8px var(--photo-border),
        0 0 0 12px rgba(217, 119, 6, 0.1);
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease;
}

.photo-placeholder:hover {
    transform: scale(1.05);
}

.photo-placeholder::before {
    content: '';
    position: absolute;
    inset: -8px;
    border-radius: 50%;
    background: var(--gradient-accent);
    opacity: 0.2;
    filter: blur(30px);
    z-index: -1;
}

.profile-photo {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center;
    box-shadow:
        0 20px 40px rgba(217, 119, 6, 0.25),
        0 0 0 8px var(--photo-border),
        0 0 0 12px rgba(217, 119, 6, 0.1);
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease;
    border: 4px solid var(--bg-card);
}

.profile-photo:hover {
    transform: scale(1.05);
}

.hero-image-placeholder::after {
    content: '';
    position: absolute;
    inset: -8px;
    border-radius: 50%;
    background: var(--gradient-accent);
    opacity: 0.2;
    filter: blur(30px);
    z-index: 0;
    pointer-events: none;
}

.hero-text {
    animation: fadeInUp 0.6s ease-out;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: var(--font-weight-bold);
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: var(--font-weight-bold);
}

.typing-cursor::after {
    content: '|';
    color: var(--accent-primary);
    animation: blink 1s infinite;
    margin-left: 2px;
}

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
    text-align: justify;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: var(--font-weight-semibold);
    font-size: 0.875rem;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 
        0 4px 12px rgba(217, 119, 6, 0.3),
        var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-primary:hover {
    background: var(--gradient-accent);
    transform: translateY(-2px);
    box-shadow: 
        0 8px 20px rgba(217, 119, 6, 0.4),
        var(--shadow-lg);
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-secondary {
    background-color: transparent;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
}

.btn-secondary:hover {
    background-color: var(--accent-primary);
    color: white;
}

/* Social Buttons */
.social-buttons {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    margin-left: var(--spacing-md);
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--social-bg);
    border: 1px solid var(--social-border);
    transition: all 0.3s ease;
    text-decoration: none;
    box-shadow: var(--social-shadow);
}

.social-btn:hover {
    background-color: var(--social-hover-bg);
    border-color: var(--social-hover-border);
    transform: translateY(-2px);
    box-shadow: var(--social-hover-shadow);
}

.social-icon {
    width: 20px;
    height: 20px;
    filter: brightness(0) invert(1);
    transition: filter 0.3s ease;
}

.social-btn:hover .social-icon {
    filter: brightness(0) invert(1) sepia(1) saturate(5) hue-rotate(25deg);
}

/* Sections */
section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-primary);
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

/* About Section */
.about {
    background: var(--gradient-section);
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
    text-align: justify;
}

.about-points {
    list-style: none;
    padding: 0;
    margin: 0;
    margin-top: var(--spacing-lg);
}

.about-points li {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
    position: relative;
    text-align: justify;
}

.about-points li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-size: 1.5rem;
    line-height: 1;
    top: 0.1rem;
}

.about-points li strong {
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
}

.about-subsection {
    margin-bottom: var(--spacing-2xl);
}

.about-subsection:last-child {
    margin-bottom: 0;
}

.about-subsection-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--accent-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.about-subsection-subtitle {
    margin-top: 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
}


.about-subsection-title::before {
    content: '';
    width: 4px;
    height: 1.5rem;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.skill-category {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.skill-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.skill-category:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
    border-color: var(--accent-primary-light);
    background: var(--bg-alt);
}

.skill-category:hover::before {
    transform: scaleX(1);
}

.skill-category-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.skill-tag {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    background-color: var(--bg-alt);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    border: 1px solid var(--border-color);
}

/* Experience Section */
.experience {
    background: var(--gradient-section);
    position: relative;
}

.experience::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.timeline {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-left: 80px;
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 0.6s ease-out;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 22px;
    top: 8px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--accent-primary);
    border: 3px solid var(--bg-card);
    box-shadow: 0 0 0 3px var(--border-color);
}

.timeline-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
}

.timeline-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.timeline-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary-light);
    transform: translateX(4px);
    background: linear-gradient(to right, var(--bg-card), var(--bg-secondary));
}

.timeline-card:hover::before {
    transform: scaleY(1);
}

.timeline-header {
    margin-bottom: var(--spacing-md);
}

.timeline-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.timeline-company {
    font-size: 1rem;
    color: var(--accent-primary);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-xs);
}

.timeline-meta {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-sm);
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.timeline-tag {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
    color: white;
}

.timeline-tag[data-category="Data Engineering"] {
    background-color: var(--badge-data-engineering);
}

.timeline-tag[data-category="Data Analysis"] {
    background-color: var(--badge-data-analysis);
}

.timeline-tag[data-category="Data Science"] {
    background-color: var(--badge-data-science);
}

.timeline-tag[data-category="Business Analytics"] {
    background-color: var(--badge-business-analytics);
}

.timeline-tag[data-category="Leadership"] {
    background-color: var(--text-tertiary);
}

.timeline-tag[data-category="Mentorship"] {
    background-color: var(--text-tertiary);
}

.timeline-tag[data-category="Career Development"] {
    background-color: var(--text-tertiary);
}

.timeline-tag[data-category="Supply Chain"] {
    background-color: var(--text-tertiary);
}

.timeline-tag[data-category="Simulation"] {
    background-color: var(--text-tertiary);
}

.timeline-tag[data-category="Research"] {
    background-color: var(--text-tertiary);
}

.timeline-bullets {
    list-style: none;
}

.timeline-bullets li {
    padding-left: var(--spacing-md);
    position: relative;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    line-height: 1.7;
    text-align: justify;
}

.timeline-bullets li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: var(--font-weight-bold);
}

.timeline-bullets li a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color 0.3s ease, text-decoration 0.3s ease;
}

.timeline-bullets li a:hover {
    color: var(--accent-primary-dark);
    text-decoration: underline;
}

/* Projects Section */
.filter-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-2xl);
}

.filter-btn {
    padding: 0.625rem 1.25rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.filter-btn.active {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(217, 119, 6, 0.3);
    font-weight: var(--font-weight-semibold);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: all 0.3s ease;
    opacity: 1;
    transform: scale(1);
    position: relative;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
    z-index: 1;
}

.project-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(217, 119, 6, 0.02) 0%, rgba(194, 65, 12, 0.02) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.project-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px);
    border-color: var(--accent-primary-light);
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-card:hover::after {
    opacity: 1;
}

.project-card.hidden {
    display: none;
}

.project-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.project-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.project-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.project-badge {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
    color: white;
}

.project-badge[data-category="Data Analysis"] {
    background-color: var(--badge-data-analysis);
}

.project-badge[data-category="Data Science"] {
    background-color: var(--badge-data-science);
}

.project-badge[data-category="Data Engineering"] {
    background-color: var(--badge-data-engineering);
}

.project-badge[data-category="LLM/Gen AI"] {
    background-color: var(--badge-llm);
}

.project-badge[data-category="Business Analytics"] {
    background-color: var(--badge-business-analytics);
}

.project-body {
    padding: var(--spacing-lg);
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
    text-align: justify;
}

.project-metrics {
    font-size: 0.875rem;
    color: var(--accent-primary);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background-color: var(--bg-alt);
    border-radius: var(--radius-sm);
}

.project-metrics-image {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    display: block;
}

.project-technologies {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.project-tech-tag {
    padding: 0.25rem 0.625rem;
    background-color: var(--bg-alt);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    border: 1px solid var(--border-color);
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.project-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: var(--font-weight-medium);
    transition: color 0.2s ease;
}

.project-link:hover {
    color: var(--accent-primary-dark);
    text-decoration: underline;
}

.project-image {
    width: 100%;
    height: auto;
    max-height: 300px;
    object-fit: cover;
    border-bottom: 1px solid var(--border-color);
    display: block;
}

.project-iframe-container {
    margin: var(--spacing-md) 0;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.project-iframe-container iframe {
    width: 100% !important;
    height: auto !important;
    min-height: 300px;
    border: none;
    display: block;
}

/* Education Section */
.education {
    background: var(--gradient-section);
    position: relative;
}

.education::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.education-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.education-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--accent-primary-light);
}

.education-degree {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.education-school {
    font-size: 1rem;
    color: var(--accent-primary);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-xs);
}

.education-meta {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-xs);
}

.education-gpa {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

/* Certifications Section */
.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    max-width: 600px;
    margin: 0 auto;
}

.certification-card {
    background: var(--bg-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all 0.3s ease;
}

.certification-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--accent-primary-light);
}

.certification-name {
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.certification-issuer {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.certification-year {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

/* Resume Section */
.resume {
    background: var(--gradient-section);
    text-align: center;
    position: relative;
}

.resume::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.resume-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Contact Section */
.contact-content {
    max-width: 700px;
    margin: 0 auto;
}

.contact-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.125rem;
    padding: var(--spacing-md);
    background-color: var(--bg-alt);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.contact-link:hover {
    background-color: var(--bg-hover);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.contact-icon {
    font-size: 1.5rem;
}

.contact-form {
    background-color: var(--bg-alt);
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 1rem;
    color: var(--text-primary);
    background-color: var(--bg-card);
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-message {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-weight: var(--font-weight-medium);
    text-align: center;
}

.hidden {
    display: none;
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--accent-primary);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.6s ease-out;
}

/* Blog Page Styles */
.blog-hero {
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    text-align: center;
    background: var(--gradient-hero);
}

.blog-hero-title {
    font-size: 3.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.blog-hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

.blog-content {
    padding: var(--spacing-2xl) 0;
}

#blog-categories {
    max-width: 1000px;
    margin: 0 auto;
}

.blog-platform-section {
    margin-bottom: var(--spacing-3xl);
}

.blog-platform-header {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

.blog-platform-title {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

.blog-platform-count {
    font-size: 1rem;
    color: var(--text-tertiary);
    font-weight: var(--font-weight-regular);
}

.blog-posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.blog-post-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.blog-post-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary-light);
}

.blog-post-content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.blog-post-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.blog-post-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.blog-post-title a:hover {
    color: var(--accent-primary);
}

.blog-post-meta {
    margin-bottom: var(--spacing-md);
}

.blog-post-date {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.blog-post-excerpt {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.blog-post-link {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color 0.2s ease;
    align-self: flex-start;
}

.blog-post-link:hover {
    color: var(--accent-primary-dark);
}

.blog-empty {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* Publications Page Styles */
.publications-hero {
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    text-align: center;
    background: var(--gradient-hero);
}

.publications-hero-title {
    font-size: 3.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.publications-hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

.citation-count {
    color: var(--accent-primary);
    font-weight: var(--font-weight-semibold);
    font-size: 0.9em;
}

.publications-google-scholar {
    margin-top: var(--spacing-lg);
}

.publications-content {
    padding: var(--spacing-2xl) 0;
}

#publications-list {
    max-width: 900px;
    margin: 0 auto;
}

.publications-year-section {
    margin-bottom: var(--spacing-3xl);
}

.publications-year-title {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border-color);
}

.publications-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.publication-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.publication-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-primary-light);
}

.publication-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.publication-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.publication-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.publication-title a:hover {
    color: var(--accent-primary);
}

.publication-authors {
    color: var(--text-secondary);
    font-size: 1rem;
    font-style: italic;
    margin-bottom: var(--spacing-xs);
}

.publication-venue {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-sm);
}

.publication-meta {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    margin-top: var(--spacing-xs);
}

.publication-year {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    font-weight: var(--font-weight-medium);
}

.publication-citations {
    font-size: 0.875rem;
    color: var(--accent-primary);
    font-weight: var(--font-weight-medium);
}

.publications-empty {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* Business Models Styles */
.business-models-container {
    max-width: 1400px;
    margin: 0 auto;
}

.business-models-header {
    margin-bottom: var(--spacing-xl);
}

.progress-notice {
    background: var(--bg-alt);
    border-left: 4px solid var(--accent-success);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-md);
}

.progress-notice p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.search-container {
    margin-bottom: var(--spacing-lg);
}

.search-input {
    width: 100%;
    max-width: 500px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-family);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.1);
}

.business-models-table-container {
    overflow-x: auto;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
}

.business-models-table {
    width: 100%;
    border-collapse: collapse;
}

.business-models-table thead {
    background: var(--gradient-primary);
    color: white;
}

.business-models-table th {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
    font-weight: var(--font-weight-semibold);
    font-size: 0.9375rem;
}

.business-models-table th.sortable {
    cursor: pointer;
    user-select: none;
    transition: background-color 0.2s ease;
}

.business-models-table th.sortable:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.sort-indicator {
    margin-left: var(--spacing-xs);
    font-size: 0.875rem;
    opacity: 0.8;
}

.business-models-table tbody tr {
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

.business-models-table tbody tr:hover {
    background-color: var(--bg-hover);
}

.business-models-table tbody tr.table-row-even {
    background-color: var(--bg-card);
}

.business-models-table tbody tr.table-row-odd {
    background-color: var(--bg-secondary);
}

.business-models-table td {
    padding: var(--spacing-md) var(--spacing-lg);
    vertical-align: top;
}

.table-cell-model {
    font-weight: var(--font-weight-semibold);
    font-size: 1.125rem;
}

.model-link {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.model-link:hover {
    color: var(--accent-primary-dark);
    text-decoration: underline;
}

.table-cell-industries {
    max-width: 400px;
}

.industries-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.industries-list li {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.6;
}

.table-cell-revenue,
.table-cell-workforce {
    min-width: 150px;
}

.revenue-value,
.workforce-value {
    font-weight: var(--font-weight-semibold);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.revenue-value {
    color: var(--accent-success);
}

.workforce-value {
    color: var(--accent-secondary);
}

.revenue-note,
.workforce-note {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    line-height: 1.4;
}

.table-cell-sources {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    max-width: 250px;
    line-height: 1.5;
}

.business-models-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--accent-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-note {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

/* Podcast Page Styles */
.podcast-hero {
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    text-align: center;
    background: var(--gradient-hero);
}

.podcast-hero-title {
    font-size: 3.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.podcast-hero-subtitle {
    font-size: 1.5rem;
    font-weight: var(--font-weight-medium);
    color: var(--accent-primary);
    margin-bottom: var(--spacing-lg);
}

.podcast-hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.7;
}

.podcast-platforms-section {
    padding: var(--spacing-3xl) 0;
    background: var(--gradient-section);
}

.podcast-platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.podcast-platform-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-xl);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.podcast-platform-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

.platform-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.platform-name {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    text-align: center;
}

.podcast-platform-card.spotify:hover .platform-icon { color: #1DB954; }
.podcast-platform-card.apple:hover .platform-icon { color: #000000; }
.podcast-platform-card.amazon:hover .platform-icon { color: #FF9900; }
.podcast-platform-card.castbox:hover .platform-icon { color: #FF6B35; }
.podcast-platform-card.goodpods:hover .platform-icon { color: #8B5CF6; }

.podcast-achievements-section {
    padding: var(--spacing-3xl) 0;
}

.achievements-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.achievements-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(650px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1700px;
    margin: 0 auto;
}

.achievement-item {
    text-align: center;
}

.achievement-image {
    width: 100%;
    max-width: 600px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
    transition: transform 0.3s ease;
}

.achievement-image:hover {
    transform: scale(1.05);
}

.achievement-caption {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

/* Business Model Detail Page Styles */
.business-model-detail {
    max-width: 900px;
    margin: 0 auto;
}

.model-header {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.model-title {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.model-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.model-stat {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.model-stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.model-stat-value {
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    color: var(--accent-primary);
    margin-bottom: var(--spacing-xs);
}

.model-stat-note {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    line-height: 1.4;
}

.model-section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.model-section-title {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border-color);
}

.model-industries-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.model-industries-list li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    line-height: 1.6;
}

.model-industries-list li:last-child {
    border-bottom: none;
}

.model-insights {
    color: var(--text-secondary);
    line-height: 1.8;
}

.model-insights p {
    margin-bottom: var(--spacing-md);
}

.model-insights p:last-child {
    margin-bottom: 0;
}

.model-sources {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    font-style: italic;
}

.model-actions {
    margin-top: var(--spacing-xl);
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: var(--spacing-md);
        font-size: 0.875rem;
    }
    
    .dropdown-menu {
        left: auto;
        right: 0;
        transform: translateX(0) translateY(-10px);
        min-width: 140px;
    }
    
    .nav-dropdown.active .dropdown-menu {
        transform: translateX(0) translateY(0);
    }
    
    /* Nested dropdown mobile styles */
    .dropdown-sub-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        border: none;
        padding-left: var(--spacing-md);
        margin-top: var(--spacing-xs);
    }
    
    .nav-dropdown-sub.active .dropdown-sub-menu {
        display: block;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .social-buttons {
        margin-left: 0;
        margin-top: var(--spacing-md);
        justify-content: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 15px;
    }
    
    .timeline-item {
        padding-left: 50px;
    }
    
    .timeline-item::before {
        left: 7px;
    }
    
    .education-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .blog-hero-title {
        font-size: 2.5rem;
    }
    
    .blog-hero-description {
        font-size: 1.125rem;
    }
    
    .blog-platform-title {
        font-size: 1.75rem;
    }
    
    .blog-posts-grid {
        grid-template-columns: 1fr;
    }
    
    .publications-hero-title {
        font-size: 2.5rem;
    }
    
    .publications-hero-description {
        font-size: 1.125rem;
    }
    
    .publications-year-title {
        font-size: 1.75rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .filter-buttons {
        gap: var(--spacing-xs);
    }
    
    .blog-hero-title {
        font-size: 2rem;
    }
    
    .blog-platform-title {
        font-size: 1.5rem;
    }
    
    .publications-hero-title {
        font-size: 2rem;
    }
    
    .publications-year-title {
        font-size: 1.5rem;
    }
    
    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }
    
    /* Business Models Responsive */
    .business-models-table-container {
        overflow-x: auto;
    }
    
    .business-models-table {
        font-size: 0.875rem;
    }
    
    .business-models-table th,
    .business-models-table td {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .table-cell-industries {
        max-width: 250px;
    }
    
    .business-models-stats {
        grid-template-columns: 1fr;
    }
    
    .model-title {
        font-size: 2rem;
    }
    
    .model-stats {
        grid-template-columns: 1fr;
    }

    /* Podcast Page Mobile Styles */
    .podcast-hero-title {
        font-size: 2.5rem;
    }

    .podcast-hero-subtitle {
        font-size: 1.25rem;
    }

    .podcast-hero-description {
        font-size: 1rem;
    }

    .podcast-platforms-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .podcast-platform-card {
        padding: var(--spacing-lg);
    }

    .platform-icon {
        font-size: 2.5rem;
    }

    .achievements-gallery {
        grid-template-columns: 1fr;
    }

    .achievement-image {
        max-width: 450px;
    }
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    z-index: 1001;
    backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
    border-color: var(--accent-primary);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* Smooth transitions for theme changes */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

/* Reduce transition duration for performance */
.theme-toggle,
.navbar,
body,
.social-btn {
    transition-duration: 0.2s;
}