/* ==========================================
   Michael Guerzhoy - Academic Website
   Modern Redesign
   ========================================== */

@import url('https://fonts.googleapis.com/css2?family=Crimson+Pro:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&family=DM+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');

:root {
    /* Color System */
    --color-bg-primary: #fdfcfa;
    --color-bg-secondary: #f5f3ef;
    --color-bg-card: #ffffff;
    --color-accent: #1e3a5f;
    --color-accent-light: #2d5a87;
    --color-accent-hover: #0d2240;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #4a4a4a;
    --color-text-muted: #6b6b6b;
    --color-border: #e0ddd8;
    --color-highlight: #daa520;
    --color-link: #1e3a5f;
    
    /* Typography */
    --font-heading: 'Crimson Pro', Georgia, serif;
    --font-body: 'DM Sans', -apple-system, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 500;
    line-height: 1.3;
    color: var(--color-text-primary);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 400;
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.75rem, 3vw, 2.25rem);
    font-weight: 500;
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-accent);
    display: inline-block;
}

h3 {
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-accent);
}

p {
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color var(--transition-fast);
    border-bottom: 1px solid transparent;
}

a:hover {
    color: var(--color-accent-hover);
    border-bottom-color: var(--color-accent-hover);
}

strong {
    font-weight: 600;
    color: var(--color-text-primary);
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.container--narrow {
    max-width: 900px;
}

/* Header / Navigation */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: #8F001A; /* UofT Maroon */
    backdrop-filter: blur(10px);
    border-bottom: none;
    padding: var(--space-sm) 0;
}

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

.header__brand {
    font-family: var(--font-heading);
    font-size: 1.65rem;
    font-weight: 500;
    color: white;
    text-decoration: none;
    border-bottom: none;
    transition: opacity var(--transition-fast);
}

.header__brand:hover {
    opacity: 0.8;
    border-bottom: none;
}

.nav {
    display: flex;
    gap: var(--space-xs);
}

.nav__link {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.95rem;
    font-weight: 500;
    color: white;
    background: #1e3a5f;
    border-radius: 6px;
    border-bottom: none;
    transition: all var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
    color: white;
    background: #2d5a87;
    border-bottom: none;
}

/* Hero Section */
.hero {
    padding: var(--space-md) 0 var(--space-sm);
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
}

.hero__content {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--space-lg);
    align-items: start;
}

.hero__text {
    padding-top: 0;
}

.hero__name {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.hero__title-label {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-xs);
}

.hero__title-label a {
    font-weight: 500;
}

.hero__memberships {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 0;
}

.hero__memberships a {
    font-weight: 500;
}

.hero__photo {
    position: relative;
    width: 280px;
}

.hero__photo img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    filter: grayscale(10%);
    transition: filter var(--transition-base);
}

.hero__photo:hover img {
    filter: grayscale(0%);
}

.hero__contact {
    padding: var(--space-sm);
    background: var(--color-bg-card);
    border-radius: 10px;
    box-shadow: var(--shadow-sm);
    font-size: 0.8rem;
    max-width: 260px;
}

.hero__contact p {
    margin-bottom: var(--space-xs);
    color: var(--color-text-secondary);
}

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

.hero__contact strong {
    color: var(--color-accent);
}

/* News Banner */
.news-banner {
    background: var(--color-accent);
    color: white;
    padding: var(--space-sm) 0;
    margin-bottom: 0;
}

.news-banner__content {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.news-banner__label {
    background: var(--color-highlight);
    color: var(--color-accent-hover);
    padding: 0.2em 0.6em;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.news-banner__text {
    color: rgba(255, 255, 255, 0.95);
    font-size: 0.95rem;
}

.news-banner__text a {
    color: white;
    border-bottom: 1px solid rgba(255, 255, 255, 0.5);
}

.news-banner__text a:hover {
    border-bottom-color: white;
}

/* Main Content Area */
.main {
    padding: var(--space-md) 0 var(--space-2xl);
}

.content-grid {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: var(--space-xl);
}

/* Sidebar Navigation */
.sidebar {
    position: sticky;
    top: 100px;
    align-self: start;
}

.sidebar__title {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.sidebar__nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sidebar__link {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    border-radius: 6px;
    border-bottom: none;
    transition: all var(--transition-fast);
    border-left: 2px solid transparent;
}

.sidebar__link:hover {
    color: var(--color-accent);
    background: var(--color-bg-secondary);
    border-left-color: var(--color-accent);
    border-bottom: none;
}

/* Sections */
.section {
    margin-bottom: var(--space-2xl);
    scroll-margin-top: 100px;
}

.section:last-child {
    margin-bottom: 0;
}

.section__content {
    color: var(--color-text-secondary);
}

/* Cards */
.card {
    background: var(--color-bg-card);
    border-radius: 10px;
    padding: var(--space-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card--highlight {
    border-left: 4px solid var(--color-highlight);
}

/* Teaching Section Styles */
.teaching-section {
    margin-bottom: var(--space-lg);
}

.teaching-section__title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.teaching-section__title::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 50%;
}

/* Course List */
.course-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.course-item {
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-secondary);
    border-radius: 8px;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.course-item:hover {
    background: var(--color-bg-card);
    border-left-color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.course-item__code {
    font-weight: 600;
    color: var(--color-accent);
}

.course-item__name {
    color: var(--color-text-primary);
}

.course-item__term {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-style: italic;
}

/* Student List */
.student-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.student-item {
    padding: var(--space-xs) 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.95rem;
}

.student-item:last-child {
    border-bottom: none;
}

.student-item__name {
    font-weight: 600;
    color: var(--color-text-primary);
}

.student-item__project {
    color: var(--color-text-secondary);
}

/* Publication/Research Styles */
.publication {
    margin-bottom: var(--space-md);
    padding-left: var(--space-md);
    border-left: 2px solid var(--color-border);
    transition: border-color var(--transition-fast);
}

.publication:hover {
    border-left-color: var(--color-accent);
}

.publication__authors {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

.publication__title {
    font-weight: 500;
    color: var(--color-accent);
}

.publication__venue {
    font-style: italic;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.publication__badge {
    display: inline-block;
    background: var(--color-highlight);
    color: white;
    padding: 0.1em 0.5em;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-left: var(--space-xs);
}

/* New Tag for recent items */
.new-tag {
    display: inline-block;
    background: var(--color-highlight);
    color: var(--color-accent-hover);
    padding: 0.15em 0.5em;
    border-radius: 3px;
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-right: 0.3em;
    vertical-align: middle;
}

/* Assignment List */
.assignment-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.assignment {
    padding: var(--space-md);
    background: var(--color-bg-secondary);
    border-radius: 10px;
    transition: all var(--transition-base);
}

.assignment:hover {
    background: var(--color-bg-card);
    box-shadow: var(--shadow-sm);
}

.assignment__title {
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

.assignment__venue {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-highlight);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.assignment__description {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

/* Media / Press Section */
.media-item {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg-card);
    border-radius: 10px;
    border: 1px solid var(--color-border);
    margin-bottom: var(--space-sm);
}

.media-item__source {
    font-weight: 600;
    color: var(--color-accent);
    font-style: italic;
}

/* Image with Caption */
.figure {
    margin: var(--space-lg) 0;
}

.figure img {
    width: 100%;
    max-width: 400px;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
}

.figure__caption {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
    font-style: italic;
}

/* Note Callout */
.note {
    background: var(--color-bg-secondary);
    border-left: 4px solid var(--color-accent);
    padding: var(--space-md);
    border-radius: 0 8px 8px 0;
    margin: var(--space-md) 0;
}

.note__title {
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

/* Footer */
.footer {
    background: var(--color-accent);
    color: white;
    padding: var(--space-lg) 0;
    margin-top: var(--space-2xl);
}

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

.footer__info {
    font-size: 0.9rem;
    opacity: 0.9;
}

.footer__info a {
    color: white;
    border-bottom: 1px solid rgba(255, 255, 255, 0.5);
}

.footer__info a:hover {
    border-bottom-color: white;
}

.footer__copyright {
    font-size: 0.8rem;
    opacity: 0.7;
}

/* Page Header (for subpages) */
.page-header {
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    padding: var(--space-md) 0;
    margin-bottom: var(--space-sm);
}

.page-header h1 {
    margin-bottom: var(--space-xs);
}

.page-header__subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
}

/* Research Page Specific */
.research-area {
    margin-bottom: var(--space-2xl);
}

.research-area__intro {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.patent-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.patent-item {
    font-size: 0.95rem;
    padding: var(--space-xs) 0;
}

/* Responsive Design */
@media (max-width: 900px) {
    .hero__content {
        grid-template-columns: 120px 1fr;
        gap: var(--space-md);
    }

    .hero__contact {
        grid-column: 1 / -1;
    }

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

    .sidebar {
        position: static;
        display: flex;
        flex-wrap: wrap;
        gap: var(--space-xs);
        padding-bottom: var(--space-md);
        border-bottom: 1px solid var(--color-border);
        margin-bottom: var(--space-lg);
    }

    .sidebar__title {
        width: 100%;
    }

    .sidebar__nav {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .sidebar__link {
        font-size: 0.85rem;
        padding: var(--space-xs);
    }
}

@media (max-width: 700px) {
    .hero__content {
        grid-template-columns: 1fr;
    }

    .hero__photo {
        max-width: 140px;
        margin: 0 auto;
    }

    .hero__text {
        text-align: center;
    }
}

@media (max-width: 600px) {
    :root {
        --space-xl: 2.5rem;
        --space-2xl: 3.5rem;
    }
    
    .header__inner {
        flex-direction: column;
        gap: var(--space-xs);
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav__link {
        font-size: 0.85rem;
        padding: var(--space-xs);
    }
    
    .footer__inner {
        flex-direction: column;
        text-align: center;
    }
}

/* Animation Utilities */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }