/* ==========================================================
   Rashmi Bhatia — Architecture Portfolio
   Light + Dark mode with smooth transitions
   ========================================================== */

/* ── Light Theme (default) ─────────────────────────────── */
:root {
    --bg: #faf9f7;
    --bg-alt: #f2f0ec;
    --bg-card: #ffffff;
    --bg-contrast: #1a1a1a;
    --text: #1a1a1a;
    --text-secondary: #6b6b6b;
    --text-tertiary: #999;
    --text-on-contrast: #faf9f7;
    --accent: #c5a47e;
    --accent-dark: #8b7355;
    --border: #e0ddd8;
    --border-light: rgba(0,0,0,0.06);
    --shadow: rgba(0,0,0,0.08);
    --nav-bg: rgba(250, 249, 247, 0.92);
    --nav-mobile-bg: #faf9f7;

    --serif: 'Playfair Display', Georgia, serif;
    --sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --max-width: 1400px;
}

/* ── Dark Theme ────────────────────────────────────────── */
[data-theme="dark"] {
    --bg: #111111;
    --bg-alt: #181818;
    --bg-card: #1e1e1e;
    --bg-contrast: #faf9f7;
    --text: #e8e6e1;
    --text-secondary: #9a9a9a;
    --text-tertiary: #666;
    --text-on-contrast: #1a1a1a;
    --accent: #d4b896;
    --accent-dark: #c5a47e;
    --border: #2a2a2a;
    --border-light: rgba(255,255,255,0.06);
    --shadow: rgba(0,0,0,0.3);
    --nav-bg: rgba(17, 17, 17, 0.92);
    --nav-mobile-bg: #111111;
}

/* ── Theme transition on all themed elements ───────────── */
body,
.nav,
.project-card,
.skill-group h3,
.timeline::before,
.about-stats,
.footer,
.contact-link,
.project-meta {
    transition: background-color 0.5s ease, color 0.5s ease, border-color 0.5s ease;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ==========================================================
   NAV
   ========================================================== */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 3rem;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition), background var(--transition);
}
.nav.scrolled { border-bottom-color: var(--border); }

.nav-logo {
    font-family: var(--serif);
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}
.nav-right {
    display: flex;
    align-items: center;
    gap: 2rem;
}
.nav-links {
    display: flex;
    gap: 2.5rem;
}
.nav-links a {
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-secondary);
    position: relative;
    transition: color var(--transition);
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0;
    width: 0; height: 1px;
    background: var(--accent);
    transition: width var(--transition);
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.nav-toggle span {
    display: block;
    width: 24px; height: 2px;
    background: var(--text);
    margin: 5px 0;
    transition: var(--transition);
}

/* ── Theme Toggle Button ──────────────────────────────── */
.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    width: 38px; height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition);
    flex-shrink: 0;
}
.theme-toggle:hover {
    color: var(--text);
    border-color: var(--accent);
    background: var(--border-light);
}
.theme-icon {
    width: 18px; height: 18px;
    transition: opacity 0.3s ease, transform 0.3s ease;
}
/* Light mode: show moon (to switch to dark), hide sun */
.theme-icon.sun { display: none; }
.theme-icon.moon { display: block; }
/* Dark mode: show sun (to switch to light), hide moon */
[data-theme="dark"] .theme-icon.sun { display: block; }
[data-theme="dark"] .theme-icon.moon { display: none; }

/* ==========================================================
   HERO
   ========================================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 6rem 2rem 4rem;
    position: relative;
    background:
        linear-gradient(135deg, rgba(197,164,126,0.06) 0%, transparent 50%),
        linear-gradient(225deg, rgba(197,164,126,0.04) 0%, transparent 50%);
}
[data-theme="dark"] .hero {
    background:
        linear-gradient(135deg, rgba(197,164,126,0.04) 0%, transparent 50%),
        linear-gradient(225deg, rgba(197,164,126,0.02) 0%, transparent 50%);
}
.hero-pre {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent-dark);
    margin-bottom: 2rem;
}
.hero-title {
    font-family: var(--serif);
    font-size: clamp(3.5rem, 10vw, 9rem);
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}
.hero-name { display: block; }
.hero-name:last-child {
    font-style: italic;
    color: var(--accent-dark);
}
.hero-sub {
    font-size: 1rem;
    font-weight: 300;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}
.hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.btn {
    display: inline-block;
    padding: 0.9rem 2.4rem;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border-radius: 0;
    transition: all var(--transition);
    cursor: pointer;
}
.btn-primary {
    background: var(--text);
    color: var(--bg);
    border: 2px solid var(--text);
}
.btn-primary:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
    color: #fff;
}
.btn-outline {
    background: transparent;
    color: var(--text);
    border: 2px solid var(--border);
}
.btn-outline:hover { border-color: var(--text); }

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}
.hero-scroll span {
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-secondary);
}
.scroll-line {
    width: 1px; height: 40px;
    background: var(--accent);
    animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* ==========================================================
   SECTIONS — Shared
   ========================================================== */
.section { padding: 7rem 0; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 3rem; }
.section-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent-dark);
    margin-bottom: 1rem;
}
.section-title {
    font-family: var(--serif);
    font-size: clamp(2rem, 4vw, 3.2rem);
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
    max-width: 700px;
}
.section-intro {
    font-size: 1.05rem;
    line-height: 1.75;
    color: var(--text-secondary);
    max-width: 680px;
    margin-bottom: 3rem;
}

/* ── Contrast sections (Studio, Contact) ──────────────── */
.contrast-section {
    background: var(--bg-contrast);
    color: var(--text-on-contrast);
}
.contrast-section .section-label { color: var(--accent); }
.contrast-section .section-intro { color: rgba(250,249,247,0.6); }
.contrast-section .project-card { background: #242424; }
.contrast-section .project-info h3 { color: var(--text-on-contrast); }
.contrast-section .project-info p { color: rgba(250,249,247,0.6); }
.contrast-section .project-meta span { color: rgba(250,249,247,0.45); }
.contrast-section .project-meta { border-top-color: rgba(255,255,255,0.08); }
.contrast-section .project-tag { color: var(--accent); }

/* Dark mode overrides for contrast sections — flip to light */
[data-theme="dark"] .contrast-section {
    background: var(--bg-alt);
    color: var(--text);
}
[data-theme="dark"] .contrast-section .section-label { color: var(--accent-dark); }
[data-theme="dark"] .contrast-section .section-intro { color: var(--text-secondary); }
[data-theme="dark"] .contrast-section .project-card { background: var(--bg-card); }
[data-theme="dark"] .contrast-section .project-info h3 { color: var(--text); }
[data-theme="dark"] .contrast-section .project-info p { color: var(--text-secondary); }
[data-theme="dark"] .contrast-section .project-meta span { color: var(--text-tertiary); }
[data-theme="dark"] .contrast-section .project-meta { border-top-color: var(--border); }
[data-theme="dark"] .contrast-section .project-tag { color: var(--accent-dark); }

/* ==========================================================
   ABOUT
   ========================================================== */
.about-grid { max-width: 800px; }
.about-body {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
}
.about-stats {
    display: flex;
    gap: 3rem;
    margin-top: 2.5rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--border);
}
.stat-num {
    display: block;
    font-family: var(--serif);
    font-size: 2.5rem;
    font-weight: 400;
    color: var(--accent-dark);
    line-height: 1;
}
.stat-label {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-top: 0.4rem;
    display: block;
}

/* ==========================================================
   PROJECTS GRID
   ========================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 3rem;
}

.project-card {
    background: var(--bg-card);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition), background-color 0.5s ease;
    cursor: pointer;
}
.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 60px var(--shadow);
}
.project-card.wide { grid-column: span 2; }

.project-images {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/10;
}
.project-images img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.project-card:hover .project-images img { transform: scale(1.03); }

.project-info { padding: 1.5rem 1.75rem 1.75rem; }
.project-tag {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-dark);
}
.project-info h3 {
    font-family: var(--serif);
    font-size: 1.4rem;
    font-weight: 400;
    margin: 0.5rem 0 0.75rem;
    letter-spacing: -0.01em;
}
.project-info p {
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--text-secondary);
}
.project-meta {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}
.project-meta span {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* ==========================================================
   FINE ART GALLERY
   ========================================================== */
.art-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 3rem;
}
.art-piece {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/10;
    cursor: pointer;
}
.art-piece img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s ease;
}
.art-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(0deg, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0.2) 50%, transparent 100%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 2rem;
    opacity: 0;
    transition: opacity var(--transition);
}
.art-piece:hover .art-overlay { opacity: 1; }
.art-piece:hover img { transform: scale(1.05); }
.art-overlay h3 {
    font-family: var(--serif);
    font-size: 1.5rem;
    color: white;
    margin-bottom: 0.5rem;
}
.art-overlay p {
    font-size: 0.85rem;
    line-height: 1.6;
    color: rgba(255,255,255,0.8);
    margin-bottom: 0.75rem;
}
.art-overlay span {
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
}

/* ==========================================================
   SKILLS
   ========================================================== */
.skills-section { background: var(--bg); }
.skills-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 3rem;
    margin-bottom: 5rem;
}
.skill-group h3 {
    font-family: var(--serif);
    font-size: 1.15rem;
    font-weight: 400;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}
.skill-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.skill-level {
    width: 60px; height: 3px;
    background: var(--border);
    border-radius: 2px;
    position: relative;
    overflow: hidden;
}
.skill-level::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    height: 100%;
    background: var(--accent-dark);
    border-radius: 2px;
}
.skill-level.proficient::after { width: 90%; }
.skill-level.intermediate::after { width: 55%; }

/* Timeline */
.timeline-title {
    font-family: var(--serif);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 2.5rem;
}
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
    content: '';
    position: absolute;
    top: 0; bottom: 0; left: 0;
    width: 1px;
    background: var(--border);
}
.timeline-item {
    position: relative;
    padding-bottom: 2.5rem;
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 2rem;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -2rem; top: 0.35rem;
    width: 7px; height: 7px;
    background: var(--accent-dark);
    border-radius: 50%;
    transform: translateX(-3px);
}
.timeline-date {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--accent-dark);
    padding-top: 0.15rem;
}
.timeline-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
}
.timeline-content p {
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--text-secondary);
}

/* ==========================================================
   CONTACT
   ========================================================== */
.contact-section {
    background: var(--bg-contrast);
    color: var(--text-on-contrast);
    text-align: center;
    padding: 8rem 0;
}
.contact-section .section-label { color: var(--accent); }
.contact-section .section-title { margin: 0 auto 1rem; }
.contact-body {
    font-size: 1.05rem;
    color: rgba(250,249,247,0.6);
    margin-bottom: 3rem;
}
.contact-links {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}
.contact-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    border: 1px solid rgba(255,255,255,0.15);
    transition: all var(--transition);
    font-size: 0.9rem;
}
.contact-link:hover {
    border-color: var(--accent);
    background: rgba(197,164,126,0.08);
}
.contact-icon { font-size: 1.2rem; }

/* Dark mode contact adjustments */
[data-theme="dark"] .contact-section {
    background: var(--bg-alt);
    color: var(--text);
}
[data-theme="dark"] .contact-section .section-label { color: var(--accent-dark); }
[data-theme="dark"] .contact-body { color: var(--text-secondary); }
[data-theme="dark"] .contact-link { border-color: var(--border); }
[data-theme="dark"] .contact-link:hover {
    border-color: var(--accent);
    background: rgba(197,164,126,0.06);
}

/* ==========================================================
   FOOTER
   ========================================================== */
.footer {
    padding: 2rem 0;
    text-align: center;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
}

/* ==========================================================
   LIGHTBOX
   ========================================================== */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0,0,0,0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    padding: 2rem;
}
.lightbox.active { opacity: 1; pointer-events: all; }
.lightbox img { max-width: 92vw; max-height: 90vh; object-fit: contain; }
.lightbox-close {
    position: absolute;
    top: 1.5rem; right: 2rem;
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.3s;
    line-height: 1;
}
.lightbox-close:hover { opacity: 1; }

/* ==========================================================
   SCROLL ANIMATIONS
   ========================================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==========================================================
   RESPONSIVE
   ========================================================== */
@media (max-width: 1024px) {
    .skills-grid { grid-template-columns: repeat(2, 1fr); gap: 2rem; }
    .art-gallery { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav { padding: 1rem 1.5rem; }
    .nav-toggle { display: block; }
    .nav-right { gap: 1rem; }
    .nav-links {
        position: fixed;
        top: 0; right: -100%;
        width: 280px; height: 100vh;
        background: var(--nav-mobile-bg);
        flex-direction: column;
        padding: 5rem 2rem 2rem;
        gap: 1.5rem;
        transition: right var(--transition);
        box-shadow: -10px 0 40px rgba(0,0,0,0.1);
    }
    .nav-links.open { right: 0; }
    .nav-links a { font-size: 1rem; }

    .container { padding: 0 1.5rem; }
    .section { padding: 4rem 0; }

    .hero { padding: 5rem 1.5rem 3rem; }
    .hero-title { font-size: clamp(2.8rem, 12vw, 5rem); }

    .projects-grid { grid-template-columns: 1fr; padding: 0 1.5rem; }
    .project-card.wide { grid-column: span 1; }

    .art-gallery { grid-template-columns: 1fr; padding: 0 1.5rem; }

    .skills-grid { grid-template-columns: 1fr; gap: 2rem; }

    .timeline-item { grid-template-columns: 1fr; gap: 0.25rem; }

    .about-stats { flex-direction: column; gap: 1.5rem; }

    .contact-links { flex-direction: column; align-items: center; }
}

@media (max-width: 480px) {
    .hero-pre { font-size: 0.65rem; }
    .hero-sub { font-size: 0.8rem; }
    .section-title { font-size: 1.8rem; }
}