/* ==========================================================================
   diplomatic.wiki — Styles
   Light-academia diplomatic archive aesthetic
   ========================================================================== */

/* --- CSS Custom Properties --- */
:root {
    /* Colors from DESIGN.md */
    --warm-white: #FDFBF7;
    --parchment-cream: #F5F0E6;
    --aged-ivory: #E8E0D0;
    --parchment-alt: #F0EBE0;
    --deep-walnut: #2C2418;
    --library-brown: #5C4E3C;
    --muted-slate: #7A7468;
    --diplomatic-gold: #B8A472;
    --seal-red: #8B3A3A;
    --embassy-green: #4A6B52;
    --faded-ink: #C4B8A0;

    /* Typography */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Lora', Georgia, serif;
    --font-mono: 'Source Code Pro', monospace;
}

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

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

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw, 1.125rem);
    line-height: 1.72;
    letter-spacing: 0.005em;
    color: var(--deep-walnut);
    background-color: var(--warm-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* Paper grain texture via SVG noise */
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3CfeComponentTransfer%3E%3CfeFuncA type='linear' slope='0.04'/%3E%3C/feComponentTransfer%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
}

/* --- Links --- */
a {
    color: var(--embassy-green);
    text-decoration: none;
    background-image: linear-gradient(var(--embassy-green), var(--embassy-green));
    background-size: 0% 1px;
    background-position: bottom left;
    background-repeat: no-repeat;
    transition: background-size 300ms ease;
}

a:hover {
    background-size: 100% 1px;
}

/* --- Hero Section --- */
.hero {
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--warm-white);
    position: relative;
    overflow: hidden;
}

.hero-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(2.8rem, 6vw, 5rem);
    font-variant: small-caps;
    letter-spacing: 0.12em;
    color: var(--deep-walnut);
    opacity: 0;
    transform: translateY(12px);
    font-feature-settings: 'liga' 1, 'kern' 1;
    line-height: 1.15;
}

.hero-title.animate-in {
    animation: heroFadeIn 900ms ease-out forwards;
}

@keyframes heroFadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-line {
    width: 240px;
    height: 1px;
    background-color: var(--diplomatic-gold);
    transform: scaleX(0);
    transform-origin: center;
}

.hero-line.animate-in {
    animation: lineExpand 700ms ease-out forwards;
}

@keyframes lineExpand {
    to {
        transform: scaleX(1);
    }
}

.hero-subtitle {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 1.1rem;
    color: var(--library-brown);
    opacity: 0;
    transform: translateY(8px);
}

.hero-subtitle.animate-in {
    animation: subtitleFadeIn 600ms ease-out forwards;
}

@keyframes subtitleFadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Navigation --- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--warm-white);
    border-bottom: 1px solid var(--diplomatic-gold);
    transition: box-shadow 300ms ease;
}

.navbar.scrolled {
    box-shadow: 0 1px 4px rgba(139, 115, 85, 0.08);
}

.nav-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 16px 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.3rem;
    font-variant: small-caps;
    letter-spacing: 0.08em;
    color: var(--deep-walnut);
    background-image: none;
}

.nav-title:hover {
    background-size: 0% 0%;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 32px;
}

.nav-link {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--library-brown);
    letter-spacing: 0.02em;
}

/* --- Main Content / Bento Grid --- */
.main-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 48px 48px 80px;
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 16px;
}

/* --- Module Base Styles --- */
.module {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 600ms cubic-bezier(0.25, 0.1, 0.25, 1),
                transform 600ms cubic-bezier(0.25, 0.1, 0.25, 1);
    transition-delay: calc(var(--module-index, 0) * 120ms);
}

.module.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* --- Book Spine Divider --- */
.book-spine-divider {
    position: relative;
    height: 13px;
    margin: 16px 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.book-spine-divider::before {
    content: '';
    display: block;
    height: 1px;
    background-color: var(--aged-ivory);
    margin-bottom: 4px;
}

.book-spine-divider::after {
    content: '';
    display: block;
    height: 3px;
    background-color: var(--diplomatic-gold);
    margin-bottom: 4px;
    box-shadow: 0 5px 0 0 var(--aged-ivory);
}

/* --- Feature Article Block --- */
.feature-article {
    grid-column: span 8;
    background-color: var(--parchment-cream);
    padding: 48px 40px;
    position: relative;
    overflow: hidden;
    /* Fold shadow */
    background-image: linear-gradient(to right, transparent 48%, rgba(139, 115, 85, 0.06) 50%, transparent 52%);
}

.feature-article .seal-watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle at center,
        rgba(184, 164, 114, 0.03) 0%,
        transparent 35%,
        rgba(184, 164, 114, 0.015) 36%,
        transparent 55%);
    pointer-events: none;
}

.module-heading {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(1.4rem, 3vw, 2.2rem);
    letter-spacing: 0.02em;
    line-height: 1.25;
    color: var(--deep-walnut);
    font-feature-settings: 'liga' 1, 'kern' 1;
}

.feature-columns {
    columns: 2;
    column-gap: 40px;
    margin-top: 8px;
}

.feature-columns p {
    margin-bottom: 1.4em;
    max-width: 68ch;
    break-inside: avoid;
}

/* --- Drop Cap --- */
.drop-cap {
    float: left;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 4.2em;
    line-height: 0.8;
    margin-right: 0.15em;
    margin-top: 0.05em;
    color: var(--deep-walnut);
    padding: 4px 8px;
    border: 1px solid var(--aged-ivory);
}

/* --- Marginalia --- */
.marginalia {
    position: absolute;
    right: -16px;
    top: 120px;
    width: 180px;
    transform: rotate(-1.5deg);
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.85rem;
    color: var(--library-brown);
    border-left: 1px dashed var(--diplomatic-gold);
    padding-left: 12px;
    line-height: 1.5;
    opacity: 0.85;
}

/* --- Corner Ornaments --- */
.corner-ornament {
    position: absolute;
    width: 16px;
    height: 16px;
    pointer-events: none;
}

.corner-ornament.top-left {
    top: 12px;
    left: 12px;
    border-top: 2px solid var(--diplomatic-gold);
    border-left: 2px solid var(--diplomatic-gold);
}

.corner-ornament.bottom-right {
    bottom: 12px;
    right: 12px;
    border-bottom: 2px solid var(--diplomatic-gold);
    border-right: 2px solid var(--diplomatic-gold);
}

/* --- Index Card Module --- */
.index-card {
    grid-column: span 4;
    background-color: #FAF7F0;
    border: 1px solid var(--faded-ink);
    padding: 28px 24px 20px;
    position: relative;
    display: flex;
    flex-direction: column;
    transition: transform 250ms ease, box-shadow 250ms ease;
}

.index-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(44, 36, 24, 0.06);
}

.card-top-rule {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--diplomatic-gold);
    transition: height 250ms ease;
}

.index-card:hover .card-top-rule {
    height: 2px;
}

.card-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    font-variant: small-caps;
    letter-spacing: 0.04em;
    line-height: 1.25;
    color: var(--deep-walnut);
    margin-bottom: 10px;
    font-feature-settings: 'liga' 1, 'kern' 1;
}

.card-description {
    font-size: 0.92rem;
    color: var(--library-brown);
    line-height: 1.6;
    flex: 1;
}

.card-code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    color: var(--muted-slate);
    margin-top: 16px;
    text-align: right;
}

/* --- Timeline Strip --- */
.timeline-strip {
    grid-column: span 12;
    height: 80px;
    background: repeating-linear-gradient(
        to right,
        var(--parchment-cream) 0,
        var(--parchment-cream) 50%,
        var(--parchment-alt) 50%,
        var(--parchment-alt) 100%
    );
    background-size: 20% 100%;
    border-top: 1px solid var(--aged-ivory);
    border-bottom: 1px solid var(--aged-ivory);
    overflow: hidden;
}

.timeline-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 24px;
}

.timeline-event {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    position: relative;
}

.timeline-event::before {
    content: '';
    position: absolute;
    top: 0;
    width: 1px;
    height: 10px;
    background-color: var(--diplomatic-gold);
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    color: var(--deep-walnut);
    font-weight: 400;
    margin-top: 12px;
}

.timeline-label {
    font-family: var(--font-body);
    font-size: 0.75rem;
    color: var(--muted-slate);
    letter-spacing: 0.02em;
}

/* --- Quotation Block --- */
.quotation-block {
    grid-column: span 6;
    background-color: var(--parchment-cream);
    padding: 40px 36px;
    border-left: 2px solid var(--diplomatic-gold);
    position: relative;
    overflow: hidden;
    transition: border-left-width 200ms ease;
}

.quotation-block:hover {
    border-left-width: 4px;
}

.quotation-block .quote-watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    background: radial-gradient(circle at center,
        rgba(184, 164, 114, 0.02) 0%,
        transparent 40%);
    pointer-events: none;
}

.quote-text {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1.2rem, 2vw, 1.6rem);
    line-height: 1.5;
    color: var(--deep-walnut);
    margin-bottom: 16px;
    font-feature-settings: 'liga' 1, 'kern' 1;
}

.quote-attribution {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.9rem;
    color: var(--library-brown);
}

/* --- Portrait Module --- */
.portrait-module {
    grid-column: span 3;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.portrait-frame {
    width: 100%;
    aspect-ratio: 1;
    border: 6px solid var(--aged-ivory);
    overflow: hidden;
    box-shadow: inset 0 0 8px rgba(44, 36, 24, 0.08);
}

.portrait-image {
    width: 100%;
    height: 100%;
    filter: sepia(0.12) contrast(1.04) brightness(1.02);
    transition: filter 400ms ease;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--aged-ivory);
}

.portrait-image svg {
    width: 100%;
    height: 100%;
}

.portrait-module:hover .portrait-image {
    filter: sepia(0) contrast(1) brightness(1);
}

.portrait-caption {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--muted-slate);
    text-align: center;
    opacity: 0;
    transition: opacity 400ms ease;
}

.portrait-module:hover .portrait-caption {
    opacity: 1;
}

.caption-dash {
    color: var(--diplomatic-gold);
}

/* --- Footer --- */
.site-footer {
    background-color: var(--parchment-cream);
    border-top: 1px solid var(--aged-ivory);
    padding: 64px 48px 40px;
}

.footer-inner {
    max-width: 1280px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 48px;
    padding: 32px 0;
}

.footer-title {
    font-family: var(--font-display);
    font-weight: 500;
    font-size: clamp(1.4rem, 3vw, 2rem);
    color: var(--deep-walnut);
    margin-bottom: 16px;
    font-feature-settings: 'liga' 1, 'kern' 1;
}

.footer-description {
    color: var(--library-brown);
    max-width: 68ch;
    line-height: 1.72;
}

.footer-meta {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    gap: 12px;
}

.footer-note {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.9rem;
    color: var(--muted-slate);
}

.footer-code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    color: var(--muted-slate);
    text-align: right;
}

.footer-copyright {
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--muted-slate);
    letter-spacing: 0.04em;
    padding-top: 24px;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

/* Tablet: 768px-1024px — 8 columns */
@media (max-width: 1024px) {
    .bento-grid {
        grid-template-columns: repeat(8, 1fr);
    }

    .feature-article {
        grid-column: span 8;
    }

    .feature-columns {
        columns: 1;
    }

    .index-card {
        grid-column: span 4;
    }

    .quotation-block {
        grid-column: span 4;
    }

    .portrait-module {
        grid-column: span 2;
    }

    .timeline-strip {
        grid-column: span 8;
    }

    .nav-inner {
        padding: 16px 32px;
    }

    .main-content {
        padding: 32px 32px 64px;
    }

    .marginalia {
        position: static;
        transform: none;
        width: 100%;
        margin-top: 20px;
        padding: 12px 16px;
        border-left: 1px dashed var(--diplomatic-gold);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

/* Mobile: <768px — single column */
@media (max-width: 767px) {
    .bento-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .feature-article,
    .index-card,
    .quotation-block,
    .portrait-module,
    .timeline-strip {
        grid-column: span 1;
    }

    .feature-article {
        padding: 32px 24px;
    }

    .feature-columns {
        columns: 1;
    }

    .nav-inner {
        padding: 12px 20px;
        flex-direction: column;
        gap: 12px;
    }

    .nav-menu {
        gap: 16px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .main-content {
        padding: 24px 20px 48px;
    }

    .marginalia {
        position: static;
        transform: none;
        width: 100%;
        margin-top: 16px;
        padding: 12px 16px;
        border-left: 1px dashed var(--diplomatic-gold);
    }

    .timeline-strip {
        height: auto;
        min-height: 80px;
        padding: 16px;
    }

    .timeline-inner {
        flex-wrap: wrap;
        gap: 12px;
        justify-content: center;
    }

    .quotation-block {
        padding: 28px 24px;
    }

    .portrait-module {
        max-width: 280px;
        margin: 0 auto;
    }

    .portrait-caption {
        opacity: 1;
    }

    .hero-title {
        letter-spacing: 0.08em;
    }

    .footer-inner {
        padding: 0;
    }

    .site-footer {
        padding: 40px 20px 32px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .footer-code {
        text-align: left;
    }
}