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

:root {
    --bg-primary: #f5efe6;
    --bg-secondary: #ebe3d5;
    --text-primary: #2c2418;
    --text-secondary: #6b5e52;
    --accent-terracotta: #c4603a;
    --accent-ochre: #c6993a;
    --accent-sage: #5b7a5e;
    --surface-dark: #1e1812;
    --card-border: #d4c9b8;
    --font-display: 'Caveat', cursive;
    --font-body: 'Source Serif 4', serif;
    --font-mono: 'IBM Plex Mono', monospace;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.1vw, 1.2rem);
    line-height: 1.72;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    position: relative;
    -webkit-font-smoothing: antialiased;
}

/* Noise texture overlay */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    filter: url(#noiseFilter);
    opacity: 0.03;
    pointer-events: none;
    z-index: 9999;
}

/* === NAVIGATION TOGGLE === */
#nav-toggle {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 1000;
    width: 44px;
    height: 44px;
    border: 1.5px solid var(--text-secondary);
    border-radius: 50%;
    background: var(--bg-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.3s, background-color 0.3s;
}

#nav-toggle:hover {
    border-color: var(--accent-terracotta);
}

.nav-icon {
    display: flex;
    flex-direction: column;
    gap: 3px;
    width: 18px;
}

.nav-icon span {
    display: block;
    height: 1.5px;
    background: var(--text-secondary);
    transition: background 0.3s;
}

.nav-icon span:nth-child(1) { width: 100%; }
.nav-icon span:nth-child(2) { width: 75%; }
.nav-icon span:nth-child(3) { width: 90%; }
.nav-icon span:nth-child(4) { width: 60%; }

#nav-toggle:hover .nav-icon span {
    background: var(--accent-terracotta);
}

/* === NAVIGATION OVERLAY === */
#nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--surface-dark);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    clip-path: circle(0% at calc(100% - 46px) 46px);
    transition: clip-path 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    pointer-events: none;
}

#nav-overlay.open {
    clip-path: circle(150% at calc(100% - 46px) 46px);
    pointer-events: all;
}

#nav-close {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    border: 1.5px solid rgba(245, 239, 230, 0.3);
    border-radius: 50%;
    background: none;
    color: var(--bg-primary);
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.3s;
}

#nav-close:hover {
    border-color: var(--accent-terracotta);
}

.nav-sections {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.nav-link {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 400;
    color: var(--bg-primary);
    text-decoration: none;
    display: block;
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.4s ease, transform 0.4s ease, color 0.2s;
    position: relative;
    padding-left: 60px;
}

.nav-link::before {
    content: attr(data-num);
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    color: var(--text-secondary);
}

#nav-overlay.open .nav-link {
    opacity: 1;
    transform: translateX(0);
}

.nav-link:hover {
    color: var(--accent-terracotta);
}

/* Stagger nav links */
#nav-overlay.open .nav-link:nth-child(1) { transition-delay: 0.1s; }
#nav-overlay.open .nav-link:nth-child(2) { transition-delay: 0.16s; }
#nav-overlay.open .nav-link:nth-child(3) { transition-delay: 0.22s; }
#nav-overlay.open .nav-link:nth-child(4) { transition-delay: 0.28s; }
#nav-overlay.open .nav-link:nth-child(5) { transition-delay: 0.34s; }
#nav-overlay.open .nav-link:nth-child(6) { transition-delay: 0.4s; }

/* === HERO === */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 0 8vw;
    overflow: hidden;
}

.hero-stamp {
    position: absolute;
    top: 50%;
    right: 12vw;
    transform: translateY(-50%);
    width: 240px;
    height: 240px;
    opacity: 0.15;
}

.stamp-svg {
    width: 100%;
    height: 100%;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 7rem);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.hero-title.visible {
    opacity: 1;
}

.hero-rule {
    height: 1px;
    background: var(--text-secondary);
    margin: 24px 0;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
    width: 100vw;
    position: relative;
    left: -8vw;
}

.hero-rule.visible {
    transform: scaleX(1);
}

.hero-subtitle {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.6s ease 0.6s, transform 0.6s ease 0.6s;
}

.hero-subtitle.visible {
    opacity: 1;
    transform: translateY(0);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    right: 40px;
    animation: counterPulse 2.5s ease-in-out infinite;
}

@keyframes counterPulse {
    0%, 100% { transform: translateY(0); opacity: 0.6; }
    50% { transform: translateY(-4px); opacity: 1; }
}

/* === DIVIDERS === */
.divider {
    position: relative;
    width: 100%;
    padding: 40px 8vw;
}

.divider-line {
    width: 100%;
    height: 4px;
    display: block;
}

.draw-line {
    stroke-dasharray: 1200;
    stroke-dashoffset: 1200;
    transition: stroke-dashoffset 1s cubic-bezier(0.22, 1, 0.36, 1);
}

.draw-line.drawn {
    stroke-dashoffset: 0;
}

.divider::before {
    content: attr(data-label);
    position: absolute;
    left: 8vw;
    top: 12px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* === SECTIONS === */
.masonry-section {
    padding: 40px 8vw 60px;
}

.section-header {
    position: relative;
    margin-bottom: 40px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3.5rem);
    font-weight: 700;
    color: var(--text-primary);
}

.annotation {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: var(--accent-terracotta);
    margin-bottom: 4px;
}

/* === MASONRY GRID === */
.masonry-grid {
    column-count: 3;
    column-gap: 24px;
}

/* === CARDS === */
.card {
    break-inside: avoid;
    background: var(--bg-secondary);
    border: 2px solid var(--card-border);
    box-shadow: 3px 3px 0 rgba(44, 36, 24, 0.06);
    padding: 24px;
    margin-bottom: 24px;
    position: relative;
    opacity: 0;
    transform: scale(0.96);
    transition: opacity 0.5s cubic-bezier(0.22, 1, 0.36, 1),
                transform 0.5s cubic-bezier(0.22, 1, 0.36, 1),
                box-shadow 0.2s ease;
    /* Ruled line underlay */
    background-image: repeating-linear-gradient(
        to bottom,
        transparent,
        transparent 27px,
        rgba(108, 94, 82, 0.08) 27px,
        rgba(108, 94, 82, 0.08) 28px
    );
    background-color: var(--bg-secondary);
}

.card.visible {
    opacity: 1;
    transform: scale(1);
}

.card:hover {
    transform: translateY(-3px) scale(1);
    box-shadow: 4px 6px 0 rgba(44, 36, 24, 0.1);
}

.card-tab {
    position: absolute;
    top: 0;
    left: 0;
    width: 24px;
    height: 6px;
    transition: width 0.2s ease;
}

.card:hover .card-tab {
    width: 40px;
}

.card--findings .card-tab { background: var(--accent-terracotta); }
.card--methods .card-tab { background: var(--accent-ochre); }
.card--team .card-tab { background: var(--accent-sage); }

.card-ref {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 0.08em;
}

.card-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 8px 0 12px;
    line-height: 1.3;
}

.card-body {
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.72;
    margin-bottom: 16px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
    border-top: 1px solid var(--card-border);
    padding-top: 12px;
}

/* === BIBLIOGRAPHY FOOTER === */
.bibliography {
    padding: 60px 8vw 40px;
    border-top: 1px solid var(--card-border);
}

.bib-list {
    list-style: none;
    margin-top: 32px;
}

.bib-entry {
    font-family: var(--font-body);
    font-size: 0.95rem;
    line-height: 1.72;
    color: var(--text-primary);
    padding-left: 40px;
    text-indent: -40px;
    margin-bottom: 12px;
}

.bib-num {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    letter-spacing: 0.08em;
    margin-right: 8px;
}

.bib-entry em {
    font-style: italic;
}

.footer-note {
    display: flex;
    gap: 32px;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--card-border);
}

.meta-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* === RESPONSIVE === */
@media (max-width: 1024px) {
    .masonry-grid {
        column-count: 2;
    }
}

@media (max-width: 640px) {
    .masonry-grid {
        column-count: 1;
    }

    .hero {
        padding: 0 6vw;
    }

    .masonry-section {
        padding: 30px 6vw 40px;
    }

    .divider {
        padding: 30px 6vw;
    }

    .hero-stamp {
        right: 5vw;
        width: 160px;
        height: 160px;
    }

    .footer-note {
        flex-direction: column;
        gap: 8px;
    }
}