/* ===========================
   R. Zheng's World - Stylesheet
   Modern, Artistic, Neat Design
   =========================== */

/* CSS Variables for consistent theming */
:root {
    --primary-bg: #0a0a0a;
    --secondary-bg: #1a1a1a;
    --accent-color: #e8d5b5;
    --text-primary: #f5f5f5;
    --text-secondary: #b8b8b8;
    --text-accent: #d4af37;
    --border-color: #333;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Georgia', 'Times New Roman', serif;
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
}

/* Music Toggle Button (Top Right) */
.music-toggle {
    position: fixed;
    top: 20px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: rgba(26, 26, 26, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: center;
}

.music-toggle:hover {
    background: var(--secondary-bg);
    border-color: var(--text-accent);
    transform: scale(1.1);
}

.music-toggle.playing {
    border-color: var(--text-accent);
    background: rgba(212, 175, 55, 0.2);
}

.speaker-icon {
    font-size: 1.5rem;
    transition: var(--transition);
}

.music-toggle.playing .speaker-icon {
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.15);
    }
}

/* Home Link (Top Right, below music button) */
.home-link {
    position: fixed;
    top: 85px;
    right: 30px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    padding: 10px 20px;
    background: rgba(26, 26, 26, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    transition: var(--transition);
    z-index: 1000;
}

.home-link:hover {
    background: var(--secondary-bg);
    color: var(--text-accent);
    border-color: var(--text-accent);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    position: relative;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
}

.hero-video {
    width: 100%;
    max-width: 900px;
    margin-bottom: 2rem;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.hero-video video {
    width: 100%;
    height: auto;
    display: block;
}

.hero-text {
    text-align: center;
    max-width: 700px;
}

.hero-name {
    font-size: 3rem;
    font-weight: 300;
    color: var(--text-accent);
    margin: 0 0 1.5rem 0;
    letter-spacing: 3px;
    font-family: 'Georgia', serif;
}

.hero-text .tagline {
    font-size: 1.4rem;
    color: var(--text-secondary);
    margin: 0.5rem 0;
    letter-spacing: 1px;
    font-weight: 300;
}

.hero-text .tagline:first-child {
    font-size: 1.8rem;
    color: var(--text-accent);
    font-weight: 400;
    margin-bottom: 1rem;
}

.hero-text .italic {
    font-style: italic;
    color: var(--accent-color);
    font-size: 1.6rem;
    margin-top: 1rem;
}

/* Main Navigation */
.main-nav {
    background: var(--secondary-bg);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.section-links {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.section-links li {
    counter-increment: section;
}

.section-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding-bottom: 5px;
}

.section-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    background: var(--text-accent);
    transition: var(--transition);
    transform: translateX(-50%);
}

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

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

/* Content Sections */
.content-section {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 3rem 2rem;
}

.content-section h2 {
    font-size: 3rem;
    color: var(--text-accent);
    margin-bottom: 2rem;
    text-align: center;
    font-weight: 300;
    letter-spacing: 2px;
}

/* Education Section */
.education-content {
    background: var(--secondary-bg);
    padding: 2.5rem;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.education-details h3 {
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.education-details p {
    margin: 0.8rem 0;
    font-size: 1.1rem;
    line-height: 1.8;
}

.education-details strong {
    color: var(--text-accent);
}

.education-details em {
    color: var(--accent-color);
    font-style: italic;
}

.coursework-list {
    list-style-position: inside;
    margin: 1rem 0 1.5rem 1.5rem;
    color: var(--text-secondary);
}

.coursework-list li {
    margin: 0.5rem 0;
    padding-left: 0.5rem;
}

.coursework-etc {
    margin: 0.2rem 0 1rem 0;
    padding-left: 2.5rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.resume-link {
    margin-top: 1.5rem;
}

.resume-link a {
    color: var(--text-accent);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 600;
    border-bottom: 2px solid var(--text-accent);
    transition: var(--transition);
}

.resume-link a:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

/* Continent Navigation */
.continent-nav {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin: 2rem 0 3rem 0;
    padding: 1.5rem;
    background: var(--secondary-bg);
    border-radius: 50px;
    border: 1px solid var(--border-color);
}

.continent-link {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    background: var(--primary-bg);
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.95rem;
    border: 1px solid transparent;
}

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

/* Gallery */
.gallery {
    margin-top: 3rem;
}

.continent-section {
    margin-bottom: 3rem;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    background: var(--secondary-bg);
}

.continent-toggle {
    width: 100%;
    background: var(--secondary-bg);
    border: none;
    padding: 1.5rem 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border-bottom: 1px solid var(--border-color);
}

.continent-toggle:hover {
    background: rgba(212, 175, 55, 0.1);
}

.continent-toggle h3 {
    font-size: 2rem;
    color: var(--text-accent);
    font-weight: 300;
    margin: 0;
    letter-spacing: 2px;
    font-family: 'Georgia', 'Times New Roman', serif;
}

.toggle-icon {
    font-size: 1.2rem;
    color: var(--text-accent);
    transition: transform 0.3s ease;
}

.continent-section.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

.continent-section.collapsed .photo-grid {
    display: none;
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 2rem;
}

.photo-grid figure {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.photo-grid figure:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(212, 175, 55, 0.2);
}

.photo-grid img {
    width: 100%;
    aspect-ratio: 3 / 2;
    object-fit: cover;
    display: block;
    transition: var(--transition);
}

.photo-grid figure:hover img {
    transform: scale(1.05);
}

.photo-grid figcaption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.9), transparent);
    color: var(--text-primary);
    padding: 1.5rem 1rem 1rem;
    text-align: center;
    font-style: italic;
    font-size: 0.95rem;
}

/* Statistics Table */
.stats-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: var(--secondary-bg);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.stats-table caption {
    font-size: 1.5rem;
    color: var(--accent-color);
    padding: 1.5rem;
    font-style: italic;
    caption-side: top;
}

.stats-table thead {
    background: rgba(212, 175, 55, 0.1);
}

.stats-table th,
.stats-table td {
    padding: 1.2rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.stats-table th {
    color: var(--text-accent);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
}

.stats-table tbody tr {
    transition: var(--transition);
}

.stats-table tbody tr:hover {
    background: rgba(212, 175, 55, 0.05);
}

.stats-table tfoot {
    background: rgba(212, 175, 55, 0.15);
    font-weight: bold;
}

.stats-table tfoot th {
    color: var(--accent-color);
}

/* Back to Top */
.back-to-top {
    text-align: center;
    margin: 3rem 0;
}

.back-to-top a {
    color: var(--text-accent);
    text-decoration: none;
    font-size: 1.1rem;
    padding: 0.8rem 2rem;
    border: 2px solid var(--text-accent);
    border-radius: 30px;
    display: inline-block;
    transition: var(--transition);
    font-weight: 600;
}

.back-to-top a:hover {
    background: var(--text-accent);
    color: var(--primary-bg);
}

/* Footer */
footer {
    background: var(--secondary-bg);
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

footer p {
    margin: 0.5rem 0;
    color: var(--text-secondary);
}

footer a {
    color: var(--text-accent);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

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

.contact-icon {
    font-size: 1.2rem;
    margin-right: 0.3rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-name {
        font-size: 2rem;
        letter-spacing: 2px;
        margin-bottom: 1rem;
    }

    .hero-text .tagline {
        font-size: 1.1rem;
    }

    .hero-text .tagline:first-child {
        font-size: 1.5rem;
    }

    .hero-text .italic {
        font-size: 1.3rem;
    }

    .content-section h2 {
        font-size: 2.2rem;
    }

    .section-links {
        gap: 1.5rem;
    }

    .continent-nav {
        gap: 0.8rem;
    }

    .photo-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .stats-table {
        font-size: 0.85rem;
    }

    .stats-table th,
    .stats-table td {
        padding: 0.8rem 0.5rem;
    }
}

/* Resume Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    position: relative;
    background: var(--secondary-bg);
    width: 75%;
    height: 85%;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-color);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 25px;
    color: var(--text-primary);
    font-size: 3rem;
    font-weight: 300;
    cursor: pointer;
    z-index: 10001;
    transition: var(--transition);
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-accent);
    transform: rotate(90deg);
}

#resumeFrame {
    width: 100%;
    height: 100%;
    border: none;
}

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

@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        height: 90%;
    }

    .modal-close {
        font-size: 2.5rem;
        top: 10px;
        right: 15px;
    }
}