/* ============================================================
   renai.review — styles.css
   Palette: midnight-blue | Typography: tech-mono
   ============================================================ */

/* --- Google Fonts are loaded in index.html --- */

/* ============================================================
   CSS Custom Properties
   ============================================================ */
:root {
    /* Palette */
    --color-midnight: #0A0E1A;
    --color-dark-navy: #111827;
    --color-deep-cerulean: #1E3A5F;
    --color-medium-blue: #2B6CB0;
    --color-sky-cerulean: #4A9EE0;
    --color-near-white: #E2E8F0;
    --color-steel-blue: #7B9EC8;
    --color-deepest: #0D1B35;

    /* Typography */
    --font-display: 'Space Mono', monospace;
    --font-body: 'Roboto Mono', monospace;
    --font-accent: 'Share Tech Mono', monospace;

    /* Spacing base 8px */
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 32px;
    --space-5: 40px;
    --space-6: 48px;
    --space-8: 64px;
    --space-10: 80px;
    --space-12: 96px;

    /* Transitions */
    --transition-zoom: all 300ms cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background-color: var(--color-midnight);
    color: var(--color-near-white);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.7;
    overflow-x: hidden;
    transition: background-color 600ms ease;
}

a {
    color: var(--color-medium-blue);
    text-decoration: none;
}

a:hover {
    color: var(--color-sky-cerulean);
}

/* ============================================================
   Coordinate Grid Background
   ============================================================ */
.coord-grid {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        linear-gradient(var(--color-deep-cerulean) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-deep-cerulean) 1px, transparent 1px);
    background-size: 48px 48px;
    opacity: 0.08;
}

/* ============================================================
   Navigation
   ============================================================ */
#nav {
    position: fixed;
    top: var(--space-3);
    left: var(--space-4);
    z-index: 100;
    font-family: var(--font-accent);
    font-size: 11px;
    letter-spacing: 0.15em;
    color: var(--color-steel-blue);
}

#nav a {
    color: var(--color-steel-blue);
    transition: color 200ms ease;
}

#nav a:hover {
    color: var(--color-near-white);
}

/* ============================================================
   Scenes — Common
   ============================================================ */
.scene {
    position: relative;
    min-height: 100vh;
    width: 100%;
    overflow: hidden;
}

/* Section tags */
.section-tag {
    font-family: var(--font-accent);
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--color-steel-blue);
    display: block;
    margin-bottom: var(--space-4);
    text-transform: uppercase;
}

/* ============================================================
   Scene 1 — The Field
   ============================================================ */
.scene--field {
    background-color: var(--color-midnight);
    display: flex;
    align-items: center;
}

.field-content {
    position: relative;
    z-index: 2;
    padding-left: 0;
    max-width: 60vw;
}

.field-headline-wrap {
    padding-left: 0;
}

.headline-main {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(48px, 7vw, 96px);
    letter-spacing: 0.1em;
    color: var(--color-near-white);
    text-transform: uppercase;
    line-height: 1.0;
    white-space: nowrap;

    /* Flush to left viewport edge */
    margin-left: -4px;
    padding-left: var(--space-3);

    /* Clip animation state */
    opacity: 0;
    transform: translateX(-60px);
    transition: opacity 600ms ease, transform 600ms ease;
}

.headline-main.revealed {
    opacity: 1;
    transform: translateX(0);
}

.headline-sub {
    font-family: var(--font-accent);
    font-size: 12px;
    letter-spacing: 0.14em;
    color: var(--color-steel-blue);
    margin-top: var(--space-3);
    margin-left: var(--space-3);

    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 500ms ease 300ms, transform 500ms ease 300ms;
}

.headline-sub.revealed {
    opacity: 1;
    transform: translateX(0);
}

/* ============================================================
   Collage Zones
   ============================================================ */
.collage-zone {
    position: absolute;
    z-index: 1;
    overflow: visible;
}

.collage-zone--field {
    right: 4vw;
    top: 15vh;
    width: 380px;
    height: 380px;
}

.collage-fragment {
    position: absolute;
    transform: rotate(var(--rot, 0deg)) translate(var(--tx, 0px), var(--ty, 0px));
    transform-origin: center center;
    transition: var(--transition-zoom);
    cursor: pointer;

    /* Staggered reveal */
    opacity: 0;
    translate: 0 20px;
}

.collage-fragment.revealed {
    opacity: 1;
    translate: 0 0;
    transition: opacity 400ms ease calc(var(--data-index, 0) * 80ms),
                translate 400ms ease calc(var(--data-index, 0) * 80ms),
                transform var(--transition-zoom),
                filter var(--transition-zoom);
}

/* zoom-focus: active fragment */
.collage-zone.focus-active .collage-fragment:not(.fragment-focused) {
    filter: blur(1px);
    opacity: 0.55;
}

.collage-fragment.fragment-focused {
    transform: rotate(var(--rot, 0deg)) translate(var(--tx, 0px), var(--ty, 0px)) scale(1.04);
    filter: blur(0px);
    z-index: 10;
}

/* Fragment inner elements */
.frag-inner {
    width: 100%;
    height: 100%;
    border: 1px solid var(--color-deep-cerulean);
}

/* Fragment type sizes */
.collage-fragment:nth-child(1) { width: 160px; height: 120px; }
.collage-fragment:nth-child(2) { width: 100px; height: 100px; }
.collage-fragment:nth-child(3) { width: 130px; height: 90px; }
.collage-fragment:nth-child(4) { width: 110px; height: 80px; }
.collage-fragment:nth-child(5) { width: 80px;  height: 80px; }
.collage-fragment:nth-child(6) { width: 120px; height: 100px; }
.collage-fragment:nth-child(7) { width: 90px;  height: 70px; }

/* Signal zone large center fragment */
.collage-zone--signal .collage-fragment:nth-child(1) {
    width: 300px;
    height: 220px;
}

/* Fragment visual types */
.frag--screenshot {
    background-color: var(--color-deep-cerulean);
    opacity: 0.85;
    filter: blur(2px);
    mix-blend-mode: screen;
}

.frag--screenshot-2 {
    background-color: #1a2f50;
    opacity: 0.8;
    filter: blur(2px);
    mix-blend-mode: screen;
}

.frag--geo {
    background-color: var(--color-deep-cerulean);
    opacity: 0.9;
    mix-blend-mode: normal;
}

.frag--geo-2 {
    background: linear-gradient(135deg, var(--color-deep-cerulean) 0%, var(--color-deepest) 100%);
    opacity: 0.95;
}

.frag--geo-3 {
    background-color: #162840;
    border: 1px solid var(--color-medium-blue);
    opacity: 0.85;
}

.frag--noise {
    background-color: var(--color-dark-navy);
    opacity: 0.7;
    mix-blend-mode: multiply;
    /* Subtle noise texture via CSS */
    background-image:
        radial-gradient(circle at 20% 30%, rgba(74,158,224,0.08) 1px, transparent 1px),
        radial-gradient(circle at 70% 60%, rgba(43,108,176,0.06) 1px, transparent 1px),
        radial-gradient(circle at 50% 80%, rgba(27,58,95,0.1) 1px, transparent 1px);
    background-size: 8px 8px, 12px 12px, 6px 6px;
}

.frag--noise-2 {
    background-color: #0e1a2e;
    opacity: 0.75;
    background-image:
        radial-gradient(circle at 30% 40%, rgba(74,158,224,0.07) 1px, transparent 1px),
        radial-gradient(circle at 75% 25%, rgba(43,108,176,0.05) 1px, transparent 1px);
    background-size: 10px 10px, 14px 14px;
}

.frag--diagram {
    background-color: var(--color-midnight);
    border: 1px solid var(--color-medium-blue);
    position: relative;
    overflow: hidden;
    mix-blend-mode: screen;
}

.frag--diagram::before,
.frag--diagram::after {
    content: '';
    position: absolute;
    background-color: var(--color-medium-blue);
    opacity: 0.5;
}

.frag--diagram::before {
    top: 50%;
    left: 10%;
    right: 10%;
    height: 1px;
}

.frag--diagram::after {
    left: 50%;
    top: 10%;
    bottom: 10%;
    width: 1px;
}

.frag--diagram-2 {
    background-color: var(--color-midnight);
    border: 1px dashed var(--color-deep-cerulean);
    position: relative;
    overflow: hidden;
}

.frag--diagram-2::before {
    content: '';
    position: absolute;
    top: 30%;
    left: 15%;
    right: 15%;
    height: 1px;
    background: var(--color-medium-blue);
    opacity: 0.4;
    box-shadow: 0 16px 0 rgba(43,108,176,0.3), 0 32px 0 rgba(43,108,176,0.2);
}

.frag--large-center {
    background: linear-gradient(160deg, var(--color-deep-cerulean) 0%, var(--color-deepest) 60%, var(--color-midnight) 100%);
    border: 1px solid var(--color-medium-blue);
}

/* Crosshair registration marks */
.frag-crosshair {
    position: absolute;
    top: -6px;
    right: -6px;
    width: 12px;
    height: 12px;
    pointer-events: none;
}

.frag-crosshair::before,
.frag-crosshair::after {
    content: '';
    position: absolute;
    background-color: var(--color-sky-cerulean);
    opacity: 0.4;
}

.frag-crosshair::before {
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    transform: translateY(-50%);
}

.frag-crosshair::after {
    left: 50%;
    top: 0;
    bottom: 0;
    width: 1px;
    transform: translateX(-50%);
}

/* Aspect ratio labels */
.frag-label {
    position: absolute;
    bottom: -18px;
    left: 0;
    font-family: var(--font-accent);
    font-size: 9px;
    letter-spacing: 0.12em;
    color: var(--color-steel-blue);
    white-space: nowrap;
}

/* ============================================================
   Scene 2 — The Methodology
   ============================================================ */
.scene--methodology {
    background-color: var(--color-dark-navy);
    display: flex;
    align-items: stretch;
    clip-path: polygon(0 4%, 100% 0%, 100% 96%, 0 100%);
    margin: -2vh 0;
    padding: 8vh 0;
}

.methodology-left {
    flex: 0 0 45%;
    padding: var(--space-12) var(--space-8) var(--space-12) var(--space-8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    z-index: 2;
}

.methodology-right {
    flex: 0 0 55%;
    position: relative;
    background-color: var(--color-deepest);
    clip-path: polygon(8% 0%, 100% 0%, 100% 100%, 0% 100%);
    overflow: visible;
}

.section-headline {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(32px, 3.5vw, 56px);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-near-white);
    line-height: 1.05;
    margin-bottom: var(--space-5);
}

.body-text {
    max-width: 480px;
}

.body-text p {
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.75;
    color: var(--color-near-white);
    margin-bottom: var(--space-4);
    opacity: 0.88;
}

/* Methodology collage zone */
.collage-zone--methodology {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 320px;
    height: 300px;
    z-index: 2;
    overflow: visible;
}

/* ============================================================
   Scene 3 — The Corpus
   ============================================================ */
.scene--corpus {
    background-color: var(--color-midnight);
    padding: var(--space-12) var(--space-8);
}

.corpus-header {
    margin-bottom: var(--space-6);
}

.corpus-tracks {
    display: flex;
    gap: var(--space-6);
    align-items: flex-start;
}

.corpus-track {
    flex: 1;
    margin-top: var(--track-offset, 0px);
    position: relative;
    z-index: 1;

    /* Staggered reveal */
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 500ms ease, transform 500ms ease;
}

.corpus-track.revealed {
    opacity: 1;
    transform: translateY(0);
}

#track-1 { transition-delay: 0ms; }
#track-2 { transition-delay: 120ms; }
#track-3 { transition-delay: 240ms; }

.track-label {
    display: block;
    font-family: var(--font-accent);
    font-size: 10px;
    letter-spacing: 0.18em;
    color: var(--color-medium-blue);
    margin-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-deep-cerulean);
    padding-bottom: var(--space-2);
}

.track-item {
    margin-bottom: var(--space-5);
}

.track-thumb {
    width: 100%;
    height: 80px;
    margin-bottom: var(--space-2);
    border: 1px solid var(--color-deep-cerulean);
}

.track-text {
    font-family: var(--font-body);
    font-size: 13px;
    line-height: 1.7;
    color: var(--color-steel-blue);
}

/* ============================================================
   Scene 4 — The Signal
   ============================================================ */
.scene--signal {
    background-color: var(--color-deepest);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-10) var(--space-8);
    gap: var(--space-8);
}

.signal-content {
    position: relative;
    z-index: 2;
    max-width: 40vw;
}

.signal-headline {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(40px, 5vw, 72px);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    line-height: 1.0;
    color: var(--color-sky-cerulean);
    transform: rotate(-3deg);
    display: inline-block;
    margin-bottom: var(--space-5);
}

.signal-body {
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.75;
    color: var(--color-near-white);
    max-width: 400px;
    opacity: 0.85;
}

/* Signal collage zone */
.collage-zone--signal {
    position: relative;
    flex: 0 0 auto;
    width: 420px;
    height: 420px;
    overflow: visible;
}

/* ============================================================
   Scene 5 — The Archive
   ============================================================ */
.scene--archive {
    background-color: var(--color-dark-navy);
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr auto;
    gap: var(--space-8);
    padding: var(--space-12) var(--space-8);
    clip-path: polygon(0 0%, 100% 3%, 100% 100%, 0 100%);
    margin-top: -2vh;
    padding-top: calc(var(--space-12) + 4vh);
}

.archive-left {
    grid-column: 1;
    grid-row: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-right: var(--space-8);
    border-right: 1px solid var(--color-deep-cerulean);
}

.archive-right {
    grid-column: 2;
    grid-row: 1;
    padding-left: var(--space-6);
}

.archive-body {
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.75;
    color: var(--color-near-white);
    opacity: 0.85;
    margin-bottom: var(--space-4);
}

.archive-entries {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.archive-entry {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: var(--space-3) var(--space-3);
    border-left: 2px solid var(--color-deep-cerulean);
    transition: border-color 250ms ease;
}

.archive-entry:hover {
    border-left-color: var(--color-medium-blue);
}

.entry-date {
    font-family: var(--font-accent);
    font-size: 10px;
    letter-spacing: 0.14em;
    color: var(--color-medium-blue);
}

.entry-title {
    font-family: var(--font-body);
    font-size: 13px;
    color: var(--color-near-white);
    letter-spacing: 0.02em;
}

.entry-meta {
    font-family: var(--font-accent);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--color-steel-blue);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
    grid-column: 1 / -1;
    grid-row: 2;
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-deep-cerulean);
    flex-wrap: wrap;
}

.footer-link {
    font-family: var(--font-accent);
    font-size: 10px;
    letter-spacing: 0.14em;
    color: var(--color-steel-blue);
}

.footer-link a {
    color: var(--color-steel-blue);
    transition: color 200ms ease;
}

.footer-link a:hover {
    color: var(--color-sky-cerulean);
}

.footer-copy {
    font-family: var(--font-accent);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--color-deep-cerulean);
    margin-left: auto;
}

/* ============================================================
   Reveal animations (IntersectionObserver-driven)
   ============================================================ */
.scene--methodology .methodology-left,
.scene--methodology .methodology-right,
.scene--signal .signal-content {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 600ms ease, transform 600ms ease;
}

.scene--methodology.revealed .methodology-left {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0ms;
}

.scene--methodology.revealed .methodology-right {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 150ms;
}

.scene--signal.revealed .signal-content {
    opacity: 1;
    transform: translateY(0);
}

.archive-entry {
    opacity: 0;
    transform: translateX(-16px);
    transition: opacity 400ms ease, transform 400ms ease, border-color 250ms ease;
}

.archive-entry.revealed {
    opacity: 1;
    transform: translateX(0);
}

/* ============================================================
   Body background color transitions
   ============================================================ */
body.bg-field       { background-color: var(--color-midnight); }
body.bg-methodology { background-color: var(--color-dark-navy); }
body.bg-corpus      { background-color: var(--color-midnight); }
body.bg-signal      { background-color: var(--color-deepest); }
body.bg-archive     { background-color: var(--color-dark-navy); }

/* ============================================================
   Corpus inner coord grid
   ============================================================ */
.scene--corpus::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--color-deep-cerulean) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-deep-cerulean) 1px, transparent 1px);
    background-size: 48px 48px;
    opacity: 0.05;
    pointer-events: none;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px) {
    .scene--methodology {
        flex-direction: column;
        clip-path: polygon(0 2%, 100% 0%, 100% 98%, 0 100%);
    }

    .methodology-left,
    .methodology-right {
        flex: none;
        width: 100%;
    }

    .methodology-right {
        clip-path: none;
        min-height: 300px;
    }

    .collage-zone--field {
        right: 2vw;
        top: 10vh;
        width: 280px;
        height: 280px;
    }

    .scene--signal {
        flex-direction: column;
        align-items: flex-start;
    }

    .signal-content {
        max-width: 100%;
    }

    .collage-zone--signal {
        width: 320px;
        height: 320px;
    }

    .scene--archive {
        grid-template-columns: 1fr;
        clip-path: none;
        padding-top: var(--space-12);
    }

    .archive-left {
        grid-column: 1;
        grid-row: 1;
        border-right: none;
        border-bottom: 1px solid var(--color-deep-cerulean);
        padding-right: 0;
        padding-bottom: var(--space-6);
    }

    .archive-right {
        grid-column: 1;
        grid-row: 2;
        padding-left: 0;
    }

    .corpus-tracks {
        flex-direction: column;
    }

    .corpus-track {
        margin-top: 0 !important;
    }

    .headline-main {
        font-size: clamp(36px, 10vw, 64px);
        white-space: normal;
    }
}