/* ============================================================
   chika.racing — styles.css
   Design: evolved-minimal, dark-neon, ma-negative-space
   ============================================================ */

/* ---- Reset & Base ---------------------------------------- */
/* palette ref: #080C0F #0D1318 #00FFD1 #B4FF00 #FFFFFF #8F9AA3 #1A2832 #000000 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-void: #080C0F;
    --bg-surface: #0D1318;
    --neon-cyan: #00FFD1;
    --neon-green: #B4FF00;
    --text-primary: #FFFFFF;
    --text-secondary: #8F9AA3;
    --border: #1A2832;

    --font-sans: 'DM Sans', sans-serif;
    --font-mono: 'DM Mono', monospace;
}

html {
    scroll-behavior: smooth;
    background: #000000;
}

body {
    background: var(--bg-void);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-weight: 400;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ---- Navigation ------------------------------------------ */
#site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 40px;
    background: linear-gradient(to bottom, rgba(8, 12, 15, 0.95) 0%, rgba(8, 12, 15, 0) 100%);
}

.nav-domain {
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-link {
    position: relative;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 12px;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    transition: color 200ms ease-out;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--neon-cyan);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 250ms ease-out;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link:hover::after {
    transform: scaleX(1);
}

.nav-data {
    display: flex;
    align-items: center;
}

/* ---- Data Fragments -------------------------------------- */
.data-fragment {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* ---- Ghost Numerals -------------------------------------- */
.ghost-numeral {
    position: absolute;
    font-family: var(--font-sans);
    font-weight: 100;
    font-size: clamp(120px, 18vw, 280px);
    color: var(--text-primary);
    opacity: 0.05;
    line-height: 1;
    pointer-events: none;
    user-select: none;
    z-index: 0;
}

.ghost-numeral--hero {
    top: 10vh;
    right: -20px;
}

.ghost-numeral--circuit {
    bottom: 10vh;
    left: -20px;
}

.ghost-numeral--telemetry {
    top: 8vh;
    right: -20px;
}

.ghost-numeral--sector {
    bottom: 15vh;
    right: 5vw;
}

/* ---- Section Base ---------------------------------------- */
section {
    min-height: 100vh;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 0 24px;
    padding: 0 40px;
    position: relative;
    align-items: center;
    overflow: hidden;
}

/* ---- Section Animation ----------------------------------- */
.section-animate {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 400ms ease-out, transform 400ms ease-out;
}

.section-animate.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---- Section Label --------------------------------------- */
.section-label {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 24px;
}

/* ---- Chevron Mark ---------------------------------------- */
.chevron-mark {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-top: 1px solid var(--neon-cyan);
    border-right: 1px solid var(--neon-cyan);
    transform: rotate(45deg);
    opacity: 0.8;
    flex-shrink: 0;
}

/* ---- Section Headlines ----------------------------------- */
.section-headline {
    font-family: var(--font-sans);
    font-size: clamp(36px, 5vw, 72px);
    font-weight: 700;
    line-height: 1.0;
    letter-spacing: -0.04em;
    color: var(--text-primary);
    margin-bottom: 32px;
}

/* ---- Section Body ---------------------------------------- */
.section-body {
    margin-bottom: 40px;
}

.section-body p {
    font-size: 16px;
    font-weight: 400;
    line-height: 1.7;
    max-width: 52ch;
    color: var(--text-secondary);
}

/* ---- Circuit Diagrams ------------------------------------ */
.circuit-diagram {
    position: absolute;
    z-index: 0;
    pointer-events: none;
}

.circuit-path {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    transition: stroke-dashoffset 1200ms ease-out;
}

.circuit-path.is-drawn {
    stroke-dashoffset: 0;
}

.circuit-parabolica {
    right: 4vw;
    top: 50%;
    transform: translateY(-50%);
    width: clamp(200px, 22vw, 320px);
    height: auto;
    opacity: 0;
    transition: opacity 600ms ease-out 400ms;
}

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

.circuit-raidillon {
    right: 5vw;
    bottom: 10vh;
    width: clamp(180px, 20vw, 300px);
    height: auto;
    opacity: 0;
    transition: opacity 600ms ease-out 400ms;
}

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

.circuit-hairpin {
    left: 5vw;
    top: 50%;
    transform: translateY(-50%);
    width: clamp(160px, 18vw, 280px);
    height: auto;
    opacity: 0;
    transition: opacity 600ms ease-out 400ms;
}

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

/* ---- Diagonal Incision Lines ----------------------------- */
.section-divider {
    position: absolute;
    left: 0;
    right: 0;
    width: 100%;
    height: 40px;
    pointer-events: none;
}

.divider--hero {
    bottom: 0;
    z-index: 2;
}

.divider-wrap {
    width: 100%;
    height: 40px;
    position: relative;
    overflow: visible;
    z-index: 10;
    margin: 0;
}

.draw-line {
    stroke-dasharray: 1200;
    stroke-dashoffset: 1200;
    transition: stroke-dashoffset 800ms ease-out;
}

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

/* ---- Hero Section ---------------------------------------- */
.section-hero {
    padding-top: 100px;
}

.hero-content {
    grid-column: 3 / 11;
    z-index: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.hero-overline {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 24px;
}

.hero-title {
    font-family: var(--font-sans);
    font-size: clamp(48px, 7vw, 96px);
    font-weight: 700;
    line-height: 1.0;
    letter-spacing: -0.04em;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.hero-sub {
    font-family: var(--font-sans);
    font-size: clamp(14px, 1.5vw, 20px);
    font-weight: 400;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.hero-data-row {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
}

.hero-data-row .data-fragment {
    position: relative;
}

.hero-data-row .data-fragment::before {
    content: '';
    position: absolute;
    left: -16px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 4px;
    background: var(--neon-cyan);
    opacity: 0.6;
}

.hero-data-row .data-fragment:first-child::before {
    display: none;
}

/* ---- Circuit Section ------------------------------------- */
.section-circuit {
    background: var(--bg-void);
}

.circuit-content {
    grid-column: 3 / 9;
    z-index: 1;
}

.circuit-data {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    border-top: 1px solid var(--border);
    padding-top: 32px;
    max-width: 52ch;
}

.data-block {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-right: 24px;
}

.data-block + .data-block {
    border-left: 1px solid var(--border);
    padding-left: 24px;
    padding-right: 24px;
}

.data-label {
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.data-value {
    font-family: var(--font-sans);
    font-size: clamp(28px, 3vw, 48px);
    font-weight: 700;
    letter-spacing: -0.04em;
    color: var(--neon-cyan);
    line-height: 1;
}

.data-unit {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-secondary);
    letter-spacing: 0.08em;
}

/* ---- Telemetry Section ----------------------------------- */
.section-telemetry {
    background: var(--bg-void);
}

.telemetry-content {
    grid-column: 4 / 11;
    z-index: 1;
}

.telemetry-board {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    padding: 24px;
    margin-bottom: 40px;
    max-width: 44ch;
}

.timing-row {
    display: grid;
    grid-template-columns: 40px 1fr auto;
    align-items: center;
    gap: 16px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(26, 40, 50, 0.5);
}

.timing-row:last-child {
    border-bottom: none;
}

.timing-key {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.timing-val {
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 400;
    color: var(--text-primary);
    letter-spacing: 0.04em;
}

.timing-delta {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.08em;
}

.timing-delta--fast {
    color: var(--neon-cyan);
}

.timing-delta--slow {
    color: var(--text-secondary);
}

.timing-delta--purple {
    color: var(--neon-green);
    letter-spacing: 0.12em;
}

.timing-divider {
    height: 1px;
    background: var(--border);
    margin: 4px 0;
}

.timing-row--total .timing-val {
    font-weight: 700;
    color: var(--neon-cyan);
    box-shadow: 0 0 12px rgba(0, 255, 209, 0.15);
}

.ambient-data {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

/* ---- Sector Section -------------------------------------- */
.section-sector {
    background: var(--bg-void);
    align-items: end;
    padding-bottom: 20vh;
}

.sector-content {
    grid-column: 3 / 9;
    z-index: 1;
}

.sector-statement {
    font-family: var(--font-sans);
    font-size: clamp(40px, 6vw, 80px);
    font-weight: 700;
    line-height: 1.0;
    letter-spacing: -0.04em;
    color: var(--text-primary);
    margin-bottom: 40px;
}

.sector-rule {
    height: 1px;
    background: var(--border);
    max-width: 52ch;
    margin-bottom: 32px;
}

.sector-data {
    display: flex;
    gap: 32px;
}

/* ---- Cursor Glow ----------------------------------------- */
.cursor-glow {
    position: fixed;
    width: 240px;
    height: 240px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 255, 209, 0.03) 0%, rgba(0, 255, 209, 0) 70%);
    pointer-events: none;
    z-index: 50;
    transform: translate(-50%, -50%);
    transition: opacity 300ms ease;
    opacity: 0;
}

/* ---- Responsive ------------------------------------------ */
@media (max-width: 768px) {
    #site-nav {
        padding: 20px 32px;
    }

    .nav-links {
        display: none;
    }

    section {
        padding: 0 32px;
        grid-template-columns: 1fr;
        gap: 0;
    }

    .hero-content,
    .circuit-content,
    .telemetry-content,
    .sector-content {
        grid-column: 1 / -1;
    }

    .ghost-numeral--hero,
    .ghost-numeral--circuit,
    .ghost-numeral--telemetry,
    .ghost-numeral--sector {
        font-size: clamp(80px, 22vw, 160px);
        right: -10px;
        left: auto;
    }

    .circuit-diagram {
        opacity: 0.15;
        width: clamp(120px, 30vw, 200px);
    }

    .circuit-parabolica {
        right: 0;
        top: 20px;
        transform: none;
    }

    .circuit-raidillon {
        right: 0;
        bottom: 60px;
    }

    .circuit-hairpin {
        left: auto;
        right: 0;
        top: 20px;
        transform: none;
    }

    .circuit-data {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .data-block + .data-block {
        border-left: none;
        border-top: 1px solid var(--border);
        padding-left: 0;
        padding-top: 16px;
    }

    .hero-data-row {
        flex-wrap: wrap;
        gap: 16px;
    }

    .ambient-data {
        gap: 16px;
    }

    .sector-data {
        flex-wrap: wrap;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    #site-nav {
        padding: 16px 24px;
    }

    section {
        padding: 0 24px;
    }
}