/* ===========================
   Apple-Inspired Design System
   Light/Dark Mode Support
   =========================== */

/* ===========================
   CSS Variables - Light Mode (Default)
   =========================== */
:root {
    /* Apple-inspired Color Palette */
    --color-accent: #0071e3;
    --color-accent-hover: #0077ed;
    --color-accent-light: rgba(0, 113, 227, 0.1);

    /* Grayscale */
    --gray-950: #1d1d1f;
    --gray-900: #2d2d2d;
    --gray-800: #424245;
    --gray-700: #6e6e73;
    --gray-600: #86868b;
    --gray-500: #a1a1a6;
    --gray-400: #c7c7cc;
    --gray-300: #d2d2d7;
    --gray-200: #e8e8ed;
    --gray-100: #f5f5f7;
    --gray-50: #fbfbfd;

    /* Semantic Colors */
    --color-success: #34c759;
    --color-warning: #ff9f0a;
    --color-error: #ff3b30;

    /* Light Mode Colors */
    --bg-primary: #ffffff;
    --bg-secondary: var(--gray-100);
    --bg-tertiary: var(--gray-50);
    --bg-elevated: rgba(255, 255, 255, 0.72);
    --bg-card: rgba(255, 255, 255, 0.8);

    --text-primary: var(--gray-950);
    --text-secondary: var(--gray-700);
    --text-tertiary: var(--gray-600);

    --border-color: rgba(0, 0, 0, 0.08);
    --border-color-strong: rgba(0, 0, 0, 0.12);

    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-mono: 'SF Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

    /* Font Sizes - Apple Scale */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1.0625rem;
    --text-lg: 1.1875rem;
    --text-xl: 1.375rem;
    --text-2xl: 1.75rem;
    --text-3xl: 2.25rem;
    --text-4xl: 3rem;
    --text-5xl: 3.5rem;
    --text-6xl: 5rem;
    --text-hero: clamp(3rem, 8vw, 6rem);

    /* Font Weights */
    --font-regular: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 28px;
    --radius-full: 9999px;

    /* Shadows - Light */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 24px 80px rgba(0, 0, 0, 0.16);
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.04), 0 12px 32px rgba(0, 0, 0, 0.08);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.25, 0.1, 0.25, 1);
    --transition-base: 300ms cubic-bezier(0.25, 0.1, 0.25, 1);
    --transition-slow: 500ms cubic-bezier(0.25, 0.1, 0.25, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Layout */
    --max-width: 1120px;
    --header-height: 52px;

    /* Theme indicator */
    --theme-icon-sun: 1;
    --theme-icon-moon: 0;
}

/* ===========================
   Dark Mode
   =========================== */
[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #1c1c1e;
    --bg-tertiary: #0d0d0d;
    --bg-elevated: rgba(28, 28, 30, 0.9);
    --bg-card: rgba(28, 28, 30, 0.72);

    --text-primary: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-tertiary: #6e6e73;

    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-strong: rgba(255, 255, 255, 0.12);

    --glass-bg: rgba(28, 28, 30, 0.72);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 24px 80px rgba(0, 0, 0, 0.5);
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.2), 0 12px 32px rgba(0, 0, 0, 0.3);

    --theme-icon-sun: 0;
    --theme-icon-moon: 1;
}

/* System preference detection */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-primary: #000000;
        --bg-secondary: #1c1c1e;
        --bg-tertiary: #0d0d0d;
        --bg-elevated: rgba(28, 28, 30, 0.9);
        --bg-card: rgba(28, 28, 30, 0.72);

        --text-primary: #f5f5f7;
        --text-secondary: #a1a1a6;
        --text-tertiary: #6e6e73;

        --border-color: rgba(255, 255, 255, 0.08);
        --border-color-strong: rgba(255, 255, 255, 0.12);

        --glass-bg: rgba(28, 28, 30, 0.72);
        --glass-border: rgba(255, 255, 255, 0.1);
        --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);

        --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
        --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
        --shadow-xl: 0 24px 80px rgba(0, 0, 0, 0.5);
        --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.2), 0 12px 32px rgba(0, 0, 0, 0.3);

        --theme-icon-sun: 0;
        --theme-icon-moon: 1;
    }
}

/* ===========================
   CSS Reset & Base
   =========================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.47059;
    letter-spacing: -0.022em;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-base), color var(--transition-base);
}

::selection {
    background: var(--color-accent);
    color: white;
}

img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    text-decoration: underline;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul,
ol {
    list-style: none;
}

/* ===========================
   Layout Components
   =========================== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section {
    padding: var(--space-8) 0;
}

.section--alt {
    background: var(--bg-secondary);
}

/* ===========================
   Header & Navigation
   =========================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--glass-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 0.5px solid var(--border-color);
    z-index: 1000;
    transition: background-color var(--transition-base);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.header__logo {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    letter-spacing: -0.03em;
}

.header__logo:hover {
    text-decoration: none;
}

.header__logo-photo {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-primary);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.header__logo:hover .header__logo-photo {
    transform: scale(1.05);
    border-color: var(--color-accent);
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav__link {
    font-size: var(--text-xs);
    font-weight: var(--font-regular);
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    text-decoration: none;
}

.nav__link:hover {
    color: var(--text-primary);
    text-decoration: none;
}

.nav__toggle {
    display: none;
    padding: var(--space-2);
    color: var(--text-primary);
}

/* Theme Toggle */
.theme-toggle {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    position: relative;
}

.theme-toggle:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.theme-toggle__icon {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.theme-toggle__sun {
    opacity: var(--theme-icon-sun);
    transform: scale(var(--theme-icon-sun));
    position: absolute;
}

.theme-toggle__moon {
    opacity: var(--theme-icon-moon);
    transform: scale(var(--theme-icon-moon));
    position: absolute;
}

/* ===========================
   Hero Section - Apple Style
   =========================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: calc(var(--header-height) + var(--space-24)) var(--space-6) var(--space-24);
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 200%;
    height: 100%;
    background: radial-gradient(ellipse 50% 80% at 50% 0%, var(--color-accent-light) 0%, transparent 50%);
    pointer-events: none;
    opacity: 0.6;
}

.hero__content {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--bg-card);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
}

.hero__badge-dot {
    width: 6px;
    height: 6px;
    background: var(--color-success);
    border-radius: var(--radius-full);
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.6;
        transform: scale(0.9);
    }
}

.hero__title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: var(--font-bold);
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-6);
    color: var(--text-primary);
    background: linear-gradient(180deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__title-accent {
    background: linear-gradient(90deg, var(--color-accent) 0%, #5856d6 50%, #af52de 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: var(--text-xl);
    font-weight: var(--font-regular);
    color: var(--text-secondary);
    margin-bottom: var(--space-10);
    line-height: 1.4;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero__actions {
    display: flex;
    gap: var(--space-4);
    justify-content: flex-start;
    flex-wrap: wrap;
}

/* Hero Grid Layout with Photo */
.hero__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
}

.hero__grid .hero__content {
    text-align: left;
    max-width: none;
}

.hero__grid .hero__subtitle {
    margin-left: 0;
    margin-right: 0;
}

.hero__image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero__image-wrapper {
    position: relative;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    padding: 4px;
    background: linear-gradient(135deg, var(--color-accent) 0%, #5856d6 50%, #af52de 100%);
    box-shadow: var(--shadow-xl);
    animation: float 6s ease-in-out infinite;
}

.hero__photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    border-radius: 50%;
    border: 4px solid var(--bg-primary);
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }
}

/* Responsive Hero Grid */
@media (max-width: 900px) {
    .hero__grid {
        grid-template-columns: 1fr;
        gap: var(--space-10);
        text-align: center;
    }

    .hero__grid .hero__content {
        text-align: center;
        order: 2;
    }

    .hero__grid .hero__subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero__grid .hero__actions {
        justify-content: center;
    }

    .hero__image {
        order: 1;
    }

    .hero__image-wrapper {
        width: 240px;
        height: 240px;
    }
}

/* ===========================
   Buttons - Apple Style
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
    font-weight: var(--font-regular);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

.btn--primary:hover {
    background: var(--color-accent-hover);
    text-decoration: none;
    transform: scale(1.02);
}

.btn--secondary {
    background: transparent;
    color: var(--color-accent);
}

.btn--secondary:hover {
    text-decoration: underline;
}

/* ===========================
   Section Headings - Apple Style
   =========================== */
.section__header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-16);
}

.section__overline {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--color-accent);
    margin-bottom: var(--space-2);
}

.section__title {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.section__description {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===========================
   Timeline - Multi-Lane CV
   =========================== */
.timeline {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.timeline__track {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    border: 1px solid var(--border-color);
    position: relative;
}

.timeline__track::before {
    content: '';
    position: absolute;
    top: 80px;
    left: 24px;
    bottom: 24px;
    width: 2px;
    background: var(--border-color);
    border-radius: 1px;
}

.timeline__header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.timeline__icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.timeline__icon--medical {
    background: linear-gradient(135deg, #0071e3 0%, #40a9ff 100%);
    color: white;
}

.timeline__icon--entrepreneur {
    background: linear-gradient(135deg, #7c3aed 0%, #a855f7 100%);
    color: white;
}

.timeline__icon--academic {
    background: linear-gradient(135deg, #059669 0%, #10b981 100%);
    color: white;
}

.timeline__title {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
}

.timeline__items {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.timeline__item {
    display: flex;
    flex-direction: column;
    padding: var(--space-4);
    padding-left: var(--space-8);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    position: relative;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.timeline__item::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-primary);
    border: 2px solid var(--bg-card);
}

.timeline__track--medical .timeline__item::before {
    background: #0071e3;
}

.timeline__track--entrepreneur .timeline__item::before {
    background: #7c3aed;
}

.timeline__track--academic .timeline__item::before {
    background: #059669;
}

.timeline__item:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.timeline__year {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    line-height: 1.2;
}

.timeline__label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-top: 2px;
}

.timeline__role {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    font-weight: var(--font-medium);
    margin-top: 2px;
}

/* Timeline with logos (LinkedIn style) */
.timeline__item--with-logo {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--space-3);
    padding-left: var(--space-4);
}

.timeline__item--with-logo::before {
    display: none;
}

.timeline__logo {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    object-fit: contain;
    background: white;
    padding: 2px;
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}

.timeline__content {
    display: flex;
    flex-direction: column;
}

/* Timeline badges with initials (for universities) */
.timeline__item--with-badge {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--space-3);
    padding-left: var(--space-4);
}

.timeline__item--with-badge::before {
    display: none;
}

.timeline__badge {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xs);
    font-weight: var(--font-bold);
    color: white;
    flex-shrink: 0;
}

.timeline__badge--saclay {
    background: linear-gradient(135deg, #6b1d3c 0%, #8b2d52 100%);
}

.timeline__badge--sorbonne {
    background: linear-gradient(135deg, #002855 0%, #003d7a 100%);
}

.timeline__badge--diderot {
    background: linear-gradient(135deg, #5c2d91 0%, #7b3db5 100%);
}

/* Clickable timeline items */
a.timeline__item--clickable {
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

a.timeline__item--clickable:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

a.timeline__item--clickable:hover .timeline__label,
a.timeline__item--clickable:hover .timeline__role,
a.timeline__item--clickable:hover .timeline__year {
    text-decoration: none;
    color: inherit;
}

/* Timeline Responsive */
@media (max-width: 1024px) {
    .timeline {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .timeline__track {
        padding: var(--space-4);
    }

    .timeline__items {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }

    .timeline__track::before {
        display: none;
    }

    .timeline__item::before {
        display: none;
    }

    .timeline__item {
        padding-left: var(--space-4);
    }
}

@media (max-width: 640px) {
    .timeline__items {
        grid-template-columns: 1fr;
    }
}

/* ===========================
   Cards - Apple Style  
   =========================== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-6);
}

.card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    transition: all var(--transition-base);
    text-decoration: none;
    color: inherit;
    display: block;
}

.card:hover {
    transform: translateY(-4px) scale(1.01);
    box-shadow: var(--shadow-card);
    border-color: var(--border-color-strong);
    text-decoration: none;
}

.card__icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-accent) 0%, #5856d6 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-5);
    color: white;
}

.card__title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
}

.card__description {
    font-size: var(--text-base);
    color: var(--text-secondary);
    margin-bottom: var(--space-5);
    line-height: 1.5;
}

.card__link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-base);
    font-weight: var(--font-regular);
    color: var(--color-accent);
}

.card__link svg {
    transition: transform var(--transition-fast);
}

.card__link:hover svg {
    transform: translateX(4px);
}

/* ===========================
   Project Cards
   =========================== */
.project-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
}

.project-card:hover {
    transform: translateY(-4px) scale(1.01);
    box-shadow: var(--shadow-card);
}

.project-card__image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
}

.project-card__content {
    padding: var(--space-6);
}

.project-card__tags {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
    margin-bottom: var(--space-4);
}

.tag {
    display: inline-flex;
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    background: var(--color-accent-light);
    color: var(--color-accent);
    border-radius: var(--radius-full);
}

.tag--teal {
    background: rgba(52, 199, 89, 0.1);
    color: #34c759;
}

.tag--purple {
    background: rgba(175, 82, 222, 0.1);
    color: #af52de;
}

.project-card__title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.project-card__description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-5);
    line-height: 1.5;
}

/* ===========================
   Blog/Opinion Cards
   =========================== */
.blog-card {
    display: flex;
    gap: var(--space-6);
    padding: var(--space-6);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    transition: all var(--transition-base);
}

.blog-card:hover {
    border-color: var(--border-color-strong);
    box-shadow: var(--shadow-md);
}

.blog-card__date {
    flex-shrink: 0;
    text-align: center;
    padding: var(--space-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    min-width: 64px;
}

.blog-card__date-day {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--color-accent);
    line-height: 1;
}

.blog-card__date-month {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.blog-card__content {
    flex: 1;
}

.blog-card__title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-2);
    color: var(--text-primary);
}

.blog-card__excerpt {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
    line-height: 1.5;
}

.blog-card__read-more {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-accent);
}

/* ===========================
   Footer - Apple Style
   =========================== */
.footer {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: var(--space-12) 0 var(--space-8);
    border-top: 1px solid var(--border-color);
}

.footer__inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-12);
    max-width: 980px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.footer__brand {
    max-width: 280px;
}

.footer__logo {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.footer__tagline {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    line-height: 1.6;
}

.footer__title {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-4);
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer__link {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.footer__link:hover {
    color: var(--text-primary);
    text-decoration: none;
}

.footer__bottom {
    margin-top: var(--space-10);
    padding-top: var(--space-6);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 980px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

.footer__copyright {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.footer__socials {
    display: flex;
    gap: var(--space-4);
}

.footer__social {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.footer__social:hover {
    background: var(--color-accent);
    color: white;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 1024px) {
    .footer__inner {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-8);
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 48px;
        --text-hero: 2.5rem;
    }

    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--glass-bg);
        backdrop-filter: saturate(180%) blur(20px);
        flex-direction: column;
        padding: var(--space-4);
        gap: 0;
        border-bottom: 1px solid var(--border-color);
    }

    .nav.active {
        display: flex;
    }

    .nav__link {
        padding: var(--space-3) var(--space-4);
        width: 100%;
        font-size: var(--text-base);
    }

    .nav__toggle {
        display: flex;
    }

    .hero {
        padding-top: calc(var(--header-height) + var(--space-16));
        padding-bottom: var(--space-16);
        min-height: auto;
    }

    .hero__subtitle {
        font-size: var(--text-lg);
    }

    .section {
        padding: var(--space-10) 0;
    }

    .section__title {
        font-size: var(--text-3xl);
    }

    .blog-card {
        flex-direction: column;
    }

    .footer__inner {
        grid-template-columns: 1fr;
    }

    .footer__bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero__actions {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }
}

/* ===========================
   Featured Cards & Badges
   =========================== */
.card--featured {
    position: relative;
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(0, 113, 227, 0.05) 100%);
    border: 1px solid var(--color-accent-light);
}

.card--featured:hover {
    border-color: var(--color-accent);
}

.card__icon--ai {
    background: linear-gradient(135deg, #0071e3 0%, #5856d6 100%);
}

.card__icon--cec {
    background: linear-gradient(135deg, #ff3b30 0%, #ff9500 100%);
}

.card__badge {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-3);
}

.card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-4);
}

/* ===========================
   Publications Section
   =========================== */
.publications-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    max-width: 800px;
    margin: 0 auto;
}

.publication-card {
    display: flex;
    gap: var(--space-6);
    padding: var(--space-6);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.publication-card:hover {
    border-color: var(--border-color-strong);
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.publication-card__year {
    flex-shrink: 0;
    width: 60px;
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--color-accent);
    text-align: center;
}

.publication-card__content {
    flex: 1;
}

.publication-card__title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    line-height: 1.4;
}

.publication-card__authors {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-1);
}

.publication-card__journal {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

.publication-card__content a {
    text-decoration: none;
    color: inherit;
}

.publication-card__content a:hover .publication-card__title {
    color: var(--color-accent);
}

@media (max-width: 600px) {
    .publication-card {
        flex-direction: column;
        gap: var(--space-3);
    }

    .publication-card__year {
        width: auto;
        text-align: left;
    }
}

/* ===========================
   Scroll Animations
   =========================== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger animation for children */
.animate-on-scroll.is-visible .card:nth-child(1),
.animate-on-scroll.is-visible .publication-card:nth-child(1) {
    transition-delay: 0ms;
}

.animate-on-scroll.is-visible .card:nth-child(2),
.animate-on-scroll.is-visible .publication-card:nth-child(2) {
    transition-delay: 100ms;
}

.animate-on-scroll.is-visible .card:nth-child(3),
.animate-on-scroll.is-visible .publication-card:nth-child(3) {
    transition-delay: 200ms;
}

/* Individual card animations */
.card,
.publication-card,
.project-card,
.blog-card {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.6s cubic-bezier(0.16, 1, 0.3, 1),
        box-shadow var(--transition-base),
        border-color var(--transition-base);
}

.is-visible .card,
.is-visible .publication-card,
.is-visible .project-card,
.is-visible .blog-card,
.card.is-visible,
.publication-card.is-visible,
.project-card.is-visible,
.blog-card.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Section header animation */
.section__header {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.section__header.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* Hero specific animation */
.hero__grid {
    opacity: 0;
    transform: translateY(30px);
    animation: heroFadeIn 1s cubic-bezier(0.16, 1, 0.3, 1) 0.2s forwards;
}

@keyframes heroFadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Subtle hover lift effect */
.card:hover,
.publication-card:hover,
.project-card:hover {
    transform: translateY(-4px);
}

/* ===========================
   Reduced Motion
   =========================== */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .animate-on-scroll,
    .card,
    .publication-card,
    .project-card,
    .blog-card,
    .section__header,
    .hero__grid {
        opacity: 1;
        transform: none;
    }
}