/* ============================================================
   XIAO LI — Artist Portfolio
   External Stylesheet
   ============================================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400&family=EB+Garamond:ital,wght@0,400;0,500;1,400&display=swap');

/* CSS Variables (Bonus: theme system) */
:root {
    --color-bg: #faf4e6;
    --color-nav-bg: #fff9e8;
    --color-text: #333333;
    --color-heading: #1f1f1f;
    --color-accent: #d4b17f;
    --color-accent-hover: #e0c68f;
    --color-footer-bg: #222222;
    --color-footer-text: #dddddd;
    --color-card-bg: #ffffff;
    --color-border: #e8dfc8;
    --color-link-visited: #a07840;
    --shadow-nav: 0 2px 10px rgba(0,0,0,0.06);
    --shadow-card: 0 4px 20px rgba(0,0,0,0.08);
    --transition-base: 0.3s ease;
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'EB Garamond', Georgia, serif;
    --max-width: 1100px;
}

/* Dark Mode Variables (Bonus: dark/light toggle) */
body.dark-mode {
    --color-bg: #1a1612;
    --color-nav-bg: #201c17;
    --color-text: #d4c9b0;
    --color-heading: #f0e8d4;
    --color-accent: #d4b17f;
    --color-accent-hover: #e0c68f;
    --color-footer-bg: #0f0d0a;
    --color-footer-text: #aaa;
    --color-card-bg: #26211a;
    --color-border: #3a3228;
    --shadow-nav: 0 2px 10px rgba(0,0,0,0.3);
    --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.9;
    font-size: 1.15rem;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============================================================
   TYPOGRAPHY — All six heading levels required
   ============================================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    color: var(--color-heading);
    line-height: 1.3;
}

h1 { font-size: 3rem; font-weight: 700; }
h2 { font-size: 2.1rem; font-weight: 700; }
h3 { font-size: 1.6rem; font-weight: 400; font-style: italic; }
h4 { font-size: 1.25rem; font-weight: 700; }
h5 { font-size: 1.05rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; }
h6 { font-size: 0.9rem; font-weight: 400; text-transform: uppercase; letter-spacing: 0.12em; color: var(--color-accent); }

p {
    margin-bottom: 1.2rem;
}

/* Text emphasis styles */
strong, b { font-weight: 700; color: var(--color-heading); }
em, i { font-style: italic; }
u, .underline { text-decoration: underline; text-underline-offset: 3px; }

/* Custom link styles */
a {
    color: var(--color-text);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:visited {
    color: var(--color-link-visited);
}

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

a:active {
    color: var(--color-accent-hover);
    opacity: 0.8;
}

/* Lists */
ul, ol {
    padding-left: 1.5rem;
    margin-bottom: 1.2rem;
}

ul li, ol li {
    margin-bottom: 0.4rem;
    line-height: 1.8;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
nav {
    background-color: var(--color-nav-bg);
    padding: 18px 0;
    box-shadow: var(--shadow-nav);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-base);
}

.nav-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
}

.nav-content h2 {
    font-size: 1.4rem;
    font-style: italic;
    font-weight: 400;
    color: var(--color-heading);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0;
}

.nav-links a {
    margin-left: 28px;
    text-decoration: none;
    color: var(--color-text);
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    padding: 4px 0;
    border-bottom: 1px solid transparent;
    transition: color var(--transition-base), border-color var(--transition-base);
}

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

.nav-links a:visited {
    color: var(--color-text);
}

.nav-links a.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* Dark mode toggle button */
.dark-toggle {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    cursor: pointer;
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-family: var(--font-body);
    margin-left: 28px;
    transition: all var(--transition-base);
}

.dark-toggle:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #000;
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
}

section {
    padding: 90px 0;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    background-color: var(--color-accent);
    color: #1a1612;
    padding: 12px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-family: var(--font-body);
    font-size: 0.95rem;
    display: inline-block;
    border: 2px solid transparent;
    cursor: pointer;
    transition: background-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

.btn:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(212,177,127,0.35);
    color: #1a1612;
}

.btn:active {
    transform: translateY(0);
}

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

.btn-outline:hover {
    background: var(--color-accent);
    color: #1a1612;
}

/* ============================================================
   HERO (index.html)
   ============================================================ */
.hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 70% 60% at 50% 40%, rgba(212,177,127,0.12) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    padding: 60px 40px;
    position: relative;
    z-index: 1;
}

/* CSS Animation — fade-in-up on hero text */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* Subtle breathing glow on accent elements */
@keyframes subtleGlow {
    0%, 100% { text-shadow: 0 0 0px transparent; }
    50% { text-shadow: 0 0 18px rgba(212,177,127,0.4); }
}

.hero h1 {
    font-size: 4.5rem;
    animation: fadeInUp 1s ease forwards;
    opacity: 0;
}

.hero h2 {
    font-size: 1.5rem;
    font-weight: 400;
    font-style: italic;
    animation: fadeInUp 1s 0.2s ease forwards;
    opacity: 0;
    color: var(--color-accent);
    animation: fadeInUp 1s 0.2s ease forwards, subtleGlow 4s 1.2s ease-in-out infinite;
}

.hero p {
    font-size: 1.15rem;
    max-width: 600px;
    margin: 25px auto 35px;
    animation: fadeIn 1s 0.5s ease forwards;
    opacity: 0;
    color: var(--color-text);
    font-style: italic;
}

.hero .btn {
    animation: fadeIn 1s 0.7s ease forwards;
    opacity: 0;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about .about-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 60px;
    align-items: start;
}

.about-photo {
    display: block;
    max-width: 320px;
    width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: var(--shadow-card);
}

.about-photo-placeholder {
    width: 280px;
    height: 380px;
    background: linear-gradient(145deg, var(--color-border), var(--color-nav-bg));
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-style: italic;
    color: var(--color-accent);
    font-family: var(--font-display);
    font-size: 0.9rem;
    text-align: center;
    padding: 20px;
}

.about-text h1 {
    margin-bottom: 8px;
}

.about-text h2 {
    font-size: 1.2rem;
    font-weight: 400;
    font-style: italic;
    color: var(--color-accent);
    margin-bottom: 30px;
}

.about-text h4 {
    margin-top: 30px;
    margin-bottom: 10px;
    color: var(--color-heading);
}

.about-text h5 {
    margin-top: 24px;
    margin-bottom: 8px;
    color: var(--color-accent);
    font-size: 0.85rem;
}

/* ============================================================
   ARTIST STATEMENT
   ============================================================ */
.statement .statement-inner {
    max-width: 720px;
    margin: 0 auto;
}

.statement h1 {
    margin-bottom: 10px;
}

.statement h6 {
    margin-bottom: 40px;
}

.statement blockquote {
    border-left: 3px solid var(--color-accent);
    padding-left: 24px;
    margin: 30px 0;
    font-style: italic;
    font-size: 1.2rem;
    color: var(--color-heading);
    font-family: var(--font-display);
}

/* ============================================================
   PROJECTS
   ============================================================ */
.projects h1 {
    margin-bottom: 12px;
}

.projects h5 {
    color: var(--color-accent);
    margin-bottom: 50px;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    align-items: start;
}

/* Card layout */
.project-card {
    background: var(--color-card-bg);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.13);
}

/* Both the video wrapper and image wrapper are fixed height so text aligns */
.video-wrapper,
.card-img-wrapper {
    width: 100%;
    height: 0;
    padding-bottom: 56.25%; /* 16:9 */
    position: relative;
    overflow: hidden;
    background: #000;
    flex-shrink: 0;
}

.video-wrapper iframe {
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.card-img-wrapper img {
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.project-card:hover .card-img-wrapper img {
    transform: scale(1.03);
}

.project-card-body {
    padding: 24px;
    flex: 1;
}

.project-card-body h3 {
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.project-card-body h6 {
    margin-bottom: 12px;
}

.project-card-body p {
    font-size: 0.98rem;
    margin-bottom: 20px;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact h1 {
    margin-bottom: 12px;
}

.contact h5 {
    color: var(--color-accent);
    margin-bottom: 40px;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info h4 {
    margin-bottom: 16px;
}

.contact-info h5 {
    margin-top: 20px;
    margin-bottom: 6px;
}

.contact-info p {
    margin-bottom: 6px;
}

/* Form styling */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
    color: var(--color-heading);
    font-family: var(--font-display);
    font-weight: 700;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(212,177,127,0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

/* Social links */
.social-links {
    display: flex;
    gap: 16px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    border-radius: 50px;
    font-size: 0.85rem;
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition-base);
}

.social-link svg {
    flex-shrink: 0;
}

.social-link:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: rgba(212,177,127,0.08);
}

/* ============================================================
   FOOTER
   ============================================================ */
footer {
    background-color: var(--color-footer-bg);
    color: var(--color-footer-text);
    padding: 40px 0;
    transition: background-color var(--transition-base);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    color: #888;
    font-size: 0.85rem;
    text-decoration: none;
    transition: color var(--transition-base);
}

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

footer p {
    font-size: 0.85rem;
    margin-bottom: 0;
}

/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */

/* Tablet */
@media (max-width: 900px) {
    h1 { font-size: 2.4rem; }
    h2 { font-size: 1.8rem; }

    .hero h1 { font-size: 3.2rem; }

    .about .about-grid {
        grid-template-columns: 200px 1fr;
        gap: 40px;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

/* Mobile */
@media (max-width: 600px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    .hero h1 { font-size: 2.5rem; }
    .hero h2 { font-size: 1.1rem; }

    .nav-content {
        flex-direction: column;
        gap: 14px;
        padding: 0 20px;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-links a {
        margin-left: 10px;
        font-size: 0.85rem;
    }

    .container { padding: 0 20px; }
    section { padding: 60px 0; }

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

    .about-photo,
    .about-photo-placeholder {
        max-width: 200px;
    }

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

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 16px;
    }
}