/* =============================================
   lunch.quest — styles.css
   Cinematic meditation on the ritual of midday eating
   ============================================= */

/* --- Custom Properties --- */
:root {
    --morning-ground: #F5F0E8;
    --noon-accent: #C4854A;
    --midday-steel: #7B8A97;
    --shadow-depth: #2E2D2B;
    --circuit-line: #8A7260;
    --text-primary: #3A3632;
    --text-secondary: #6B6460;
    --bg-gradient-start: #FAF7F2;
    --bg-gradient-end: #E8E6E2;
    --interval-dark: #1A1816;
    --annotation-color: #9E948A;

    --scroll-progress: 0;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 340;
    font-size: 19px;
    line-height: 1.72;
    letter-spacing: 0.015em;
    color: var(--text-primary);
    background: var(--bg-gradient-start);
    overflow-x: hidden;
    transition: background-color 0.1s linear;
}

/* --- Frame (Section Container) --- */
.frame {
    position: relative;
    width: 100%;
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* --- THE LONG TAKE OPENING --- */
.frame--opening {
    height: 100vh;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

.opening__horizon {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(
        92deg,
        transparent 0%,
        var(--circuit-line) 15%,
        var(--noon-accent) 50%,
        var(--midday-steel) 85%,
        transparent 100%
    );
    transform: translateY(-50%);
    opacity: 0.6;
}

.opening__credit {
    position: absolute;
    bottom: 25%;
    right: 12%;
    font-family: 'Bebas Neue', sans-serif;
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 0.45em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* --- INTERVAL PANELS --- */
.interval-panel {
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.interval-panel--dark {
    background: var(--interval-dark);
}

.interval__text {
    font-family: 'Bebas Neue', sans-serif;
    font-size: clamp(28px, 5vw, 72px);
    font-weight: 400;
    letter-spacing: 0.12em;
    line-height: 0.92;
    text-transform: uppercase;
    text-align: center;
    max-width: 80%;
    opacity: 0;
    transition: opacity 1400ms ease;
}

.interval-panel:not(.interval-panel--dark) .interval__text {
    color: var(--text-secondary);
}

.interval-panel--dark .interval__text {
    color: var(--morning-ground);
}

.interval__attribution {
    display: block;
    margin-top: 24px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    font-weight: 350;
    letter-spacing: 0.06em;
    color: var(--annotation-color);
    opacity: 0;
    transition: opacity 1400ms ease 200ms;
}

.watermark-numeral {
    position: absolute;
    font-family: 'Bebas Neue', sans-serif;
    font-size: clamp(120px, 20vw, 240px);
    font-weight: 400;
    color: var(--morning-ground);
    opacity: 0.06;
    pointer-events: none;
    user-select: none;
    z-index: 0;
    line-height: 1;
}

/* --- INQUIRY GRID --- */
.frame--inquiry {
    min-height: auto;
    padding: 10vh 0;
}

.inquiry__grid {
    display: grid;
    grid-template-columns: 65fr 35fr;
    gap: clamp(24px, 4vw, 80px);
    max-width: 1100px;
    width: 90%;
    margin: 0 auto;
    padding: 0 24px;
}

.inquiry__body {
    max-width: 52ch;
}

.section-headline {
    font-family: 'Bebas Neue', sans-serif;
    font-size: clamp(48px, 8vw, 120px);
    font-weight: 400;
    letter-spacing: 0.12em;
    line-height: 0.92;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(30px);
}

.body-text {
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 340;
    font-size: clamp(16px, 1.2vw, 20px);
    line-height: 1.72;
    letter-spacing: 0.015em;
    color: var(--text-primary);
    margin-bottom: 24px;
    opacity: 0;
    transform: translateY(20px);
}

.body-text em {
    font-style: italic;
    font-weight: 340;
}

.inquiry__margin {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding-top: 80px;
}

.annotation {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    font-weight: 350;
    letter-spacing: 0.06em;
    color: var(--annotation-color);
    line-height: 1.5;
    opacity: 0;
    transform: translateY(20px);
}

.annotation em {
    font-style: italic;
}

/* --- CIRCUIT DIAGRAMS --- */
.circuit-container {
    width: 90%;
    max-width: 500px;
    margin: 60px auto 40px;
    opacity: 0;
    transition: opacity 400ms ease;
}

.circuit-container.is-visible {
    opacity: 1;
}

.meal-circuit {
    width: 100%;
    height: auto;
}

.circuit-node {
    fill: none;
    stroke: var(--circuit-line);
    stroke-width: 1.5px;
}

.circuit-node--junction {
    stroke-width: 1.5px;
}

.circuit-node--filled {
    fill: var(--circuit-line);
    stroke: var(--circuit-line);
    stroke-width: 1.5px;
}

.circuit-trace {
    fill: none;
    stroke: var(--circuit-line);
    stroke-width: 1px;
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
}

.circuit-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 9px;
    font-weight: 350;
    fill: var(--annotation-color);
    letter-spacing: 0.06em;
}

.circuit-tick {
    stroke: var(--circuit-line);
    stroke-width: 0.75px;
}

/* --- EVIDENCE STRIP --- */
.frame--evidence {
    min-height: 120px;
    height: 120px;
    overflow: hidden;
    position: relative;
}

.evidence__ribbon {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.evidence__svg {
    width: 2400px;
    height: 80px;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    will-change: transform;
}

.data-ribbon {
    stroke: var(--circuit-line);
    stroke-width: 0.5px;
    opacity: 0.3;
}

.clock-trace {
    fill: none;
    stroke: var(--noon-accent);
    stroke-width: 1px;
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
}

/* --- FORK GLYPH --- */
.fork-glyph {
    position: absolute;
    height: 240px;
    width: auto;
    opacity: 0.08;
    z-index: 0;
    pointer-events: none;
}

.fork-tine,
.fork-base,
.fork-handle {
    stroke: var(--morning-ground);
    stroke-width: 1.5px;
    fill: none;
}

.interval-panel--final .interval__text {
    position: relative;
    z-index: 1;
}

/* --- ENDING --- */
.frame--ending {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.ending__period {
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 48px;
    color: var(--text-secondary);
    opacity: 0;
    transition: opacity 1400ms ease;
}

/* --- REVEAL ANIMATIONS --- */
.section-headline.is-visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 600ms cubic-bezier(0.16, 1, 0.3, 1),
                transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

.body-text.is-visible,
.annotation.is-visible {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 800ms cubic-bezier(0.16, 1, 0.3, 1),
                transform 800ms cubic-bezier(0.16, 1, 0.3, 1);
}

.interval-panel.is-visible .interval__text,
.interval-panel.is-visible .interval__attribution {
    opacity: 1;
}

.ending__period.is-visible {
    opacity: 1;
}

/* Circuit trace drawing animation */
.circuit-trace.is-drawing {
    transition: stroke-dashoffset 1200ms cubic-bezier(0.16, 1, 0.3, 1);
    stroke-dashoffset: 0;
}

.clock-trace.is-drawing {
    transition: stroke-dashoffset 1200ms cubic-bezier(0.16, 1, 0.3, 1);
    stroke-dashoffset: 0;
}

/* --- DATA FLOW RIBBON UNDULATION (CSS sin-wave) --- */
@keyframes undulate {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(2px); }
}

.data-ribbon:nth-child(odd) {
    animation: undulate 6s ease-in-out infinite;
}

.data-ribbon:nth-child(even) {
    animation: undulate 6s ease-in-out infinite 3s;
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
    .inquiry__grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .inquiry__margin {
        padding-top: 0;
        padding-left: 16px;
        border-left: 1px solid var(--circuit-line);
    }

    .opening__credit {
        bottom: 15%;
        right: 8%;
        font-size: 12px;
    }

    .section-headline {
        font-size: clamp(36px, 10vw, 72px);
    }

    .frame--evidence {
        min-height: 80px;
        height: 80px;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 17px;
    }

    .inquiry__grid {
        width: 95%;
        padding: 0 16px;
    }

    .section-headline {
        margin-bottom: 24px;
    }

    .circuit-container {
        max-width: 100%;
    }
}