/* ============================================================
   infra.day — The Invisible Architecture
   Honeyed-neutral palette, magazine-spread layout, zen tone.
   ============================================================ */

/* ---------- Custom Properties ---------- */
:root {
    --bg-primary: #F5EFE6;
    --bg-secondary: #EDE4D5;
    --surface-warm: #E3D5C0;
    --text-primary: #3B3226;
    --text-secondary: #6B5D4F;
    --text-tertiary: #9A8E80;
    --text-body: #4A4238;
    --accent-gold: #C8A96E;
    --accent-dark: #5C4A32;
    --border: #D4C8B5;
    --dark-section: #2E2518;
    --mono-bg: rgba(59, 50, 38, 0.06);
    --mono-text: #7B6E5E;

    --serif: "Playfair Display", Georgia, serif;
    --sans: "Source Sans 3", "Inter", system-ui, sans-serif;
    --mono: "IBM Plex Mono", "Space Mono", Menlo, monospace;

    --reveal-ease: cubic-bezier(0.16, 1, 0.3, 1);
    --tilt-ease: cubic-bezier(0.03, 0.98, 0.52, 0.99);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--sans);
    font-weight: 400;
    font-size: 18px;
    line-height: 1.65;
    color: var(--text-body);
    letter-spacing: 0.005em;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    background-attachment: fixed;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
    font-family: var(--serif);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.03em;
    line-height: 0.95;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.02em;
    line-height: 1.05;
    margin-bottom: 1.5rem;
}

p {
    margin-bottom: 1.4rem;
}

p:last-child {
    margin-bottom: 0;
}

code, .mono {
    font-family: var(--mono);
    font-size: 0.94em;
    color: var(--mono-text);
    background: var(--mono-bg);
    padding: 0 4px;
}

/* ---------- Scroll Container ---------- */
.scroll-container {
    height: 100vh;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
    scrollbar-width: none;
    -ms-overflow-style: none;
    perspective: 1200px;
}

.scroll-container::-webkit-scrollbar {
    display: none;
}

/* ---------- Spread (full viewport) ---------- */
.spread {
    width: 100%;
    height: 100vh;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 0;
    padding: clamp(2.5rem, 6vh, 5rem) clamp(2.5rem, 6vw, 6rem);
    position: relative;
    align-items: center;
    overflow: hidden;
}

.spread-left,
.spread-right {
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 100%;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--reveal-ease),
                transform 0.8s var(--reveal-ease);
}

.spread-content {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: 100%;
    position: relative;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--reveal-ease),
                transform 0.8s var(--reveal-ease);
}

.spread.in-view .spread-left,
.spread.in-view .spread-right,
.spread.in-view .spread-content {
    opacity: 1;
    transform: translateY(0);
}

.spread.in-view .spread-right {
    transition-delay: 200ms;
}

/* ---------- Spread 1: Title (full bleed, centered) ---------- */
.spread-title {
    background: var(--bg-primary);
    grid-template-columns: 1fr;
}

.spread-title .spread-content {
    align-items: center;
    text-align: center;
}

.title-hero {
    text-align: center;
    transform-style: preserve-3d;
}

.domain-name {
    font-family: var(--serif);
    font-weight: 700;
    font-size: clamp(5rem, 12vw, 14rem);
    color: var(--text-primary);
    letter-spacing: -0.04em;
    line-height: 0.92;
    margin-bottom: 1.5rem;
}

.domain-subtitle {
    font-family: var(--serif);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1.1rem, 1.6vw, 1.5rem);
    color: var(--text-tertiary);
    letter-spacing: 0.01em;
    line-height: 1.2;
    margin-bottom: 0;
}

.chevron-down {
    position: absolute;
    bottom: clamp(2rem, 5vh, 3rem);
    left: 50%;
    width: 32px;
    height: 32px;
    color: var(--accent-gold);
    transform: translateX(-50%);
    opacity: 0;
    animation: chevron-fade-in 1.5s var(--reveal-ease) 2s forwards,
               chevron-bounce 2.4s ease-in-out 3.5s infinite;
}

@keyframes chevron-fade-in {
    from { opacity: 0; transform: translate(-50%, -10px); }
    to   { opacity: 0.4; transform: translate(-50%, 0); }
}

@keyframes chevron-bounce {
    0%, 100% { transform: translate(-50%, 0); opacity: 0.4; }
    50%      { transform: translate(-50%, 6px); opacity: 0.6; }
}

/* ---------- Colophon Strips (between spreads) ---------- */
.colophon-strip {
    width: 100%;
    height: 8vh;
    min-height: 60px;
    scroll-snap-align: start;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    position: relative;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.colophon-text {
    font-family: var(--sans);
    font-weight: 300;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--text-tertiary);
    margin: 0;
}

.topology-icon {
    width: 44px;
    height: 44px;
    color: var(--text-secondary);
    opacity: 0.55;
}

/* Colophon 4 → darkening transition into Materials spread */
.colophon-4 {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--dark-section) 100%);
    border-top-color: var(--border);
    border-bottom: none;
}

.colophon-4 .colophon-text {
    color: var(--surface-warm);
}

/* Colophon 5 → lightening transition out of Materials */
.colophon-5 {
    background: linear-gradient(180deg, var(--dark-section) 0%, var(--bg-secondary) 100%);
    border-top: none;
    border-bottom-color: var(--border);
}

.uptime-pulse {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-gold);
    box-shadow: 0 0 12px rgba(200, 169, 110, 0.45);
    opacity: 0.7;
    animation: uptime-pulse 4s ease-in-out infinite;
}

@keyframes uptime-pulse {
    0%, 100% { transform: scale(1.0); opacity: 0.6; }
    50%      { transform: scale(1.15); opacity: 1.0; }
}

/* ---------- Spread 2: Philosophy ---------- */
.spread-philosophy {
    background: var(--bg-primary);
    grid-template-columns: 4.4fr 0.2fr 3.4fr;
}

.spread-philosophy .spread-left {
    grid-column: 1 / 2;
    align-items: center;
    justify-content: center;
}

.spread-philosophy .spread-right {
    grid-column: 3 / 4;
    align-items: flex-start;
}

.stack-layers {
    width: min(420px, 90%);
    height: 320px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s var(--tilt-ease);
}

.layer {
    position: absolute;
    left: 0;
    width: 100%;
    height: 38px;
    border: 1px solid rgba(59, 50, 38, 0.08);
    border-radius: 2px;
    transition: transform 0.6s var(--tilt-ease);
}

.layer-1 { top: 0;    background: var(--surface-warm);  transform: translateX(0px);  }
.layer-2 { top: 52px; background: #D4BFA0;              transform: translateX(14px); }
.layer-3 { top: 104px; background: var(--accent-gold);  transform: translateX(28px); opacity: 0.92; }
.layer-4 { top: 156px; background: #8E7857;             transform: translateX(42px); }
.layer-5 { top: 208px; background: var(--accent-dark);  transform: translateX(56px); }

.philosophy-text {
    max-width: 40ch;
}

.philosophy-text p {
    font-size: clamp(1rem, 1.15vw, 1.18rem);
    color: var(--text-body);
    line-height: 1.7;
}

.philosophy-text p:first-child::first-letter {
    font-family: var(--serif);
    font-weight: 700;
    font-size: 3.4em;
    float: left;
    line-height: 0.85;
    margin: 6px 10px 0 -2px;
    color: var(--text-primary);
}

/* ---------- Spread 3: Topology ---------- */
.spread-topology {
    background: var(--bg-primary);
    grid-template-columns: 3.2fr 0.4fr 4.4fr;
}

.spread-topology .spread-left {
    grid-column: 1 / 2;
    justify-content: center;
}

.spread-topology .spread-right {
    grid-column: 3 / 4;
    align-items: center;
    justify-content: center;
}

.topology-text {
    max-width: 36ch;
}

.topology-text h2 {
    color: var(--text-primary);
}

.topology-text p {
    font-size: clamp(0.95rem, 1.05vw, 1.05rem);
    color: var(--text-body);
    column-count: 1;
}

@media (min-width: 1100px) {
    .topology-text p {
        column-count: 1;
    }
}

.topology-diagram {
    width: min(440px, 92%);
    height: auto;
    max-height: 70vh;
    overflow: visible;
}

.node {
    fill: var(--accent-gold);
    filter: drop-shadow(0 0 8px rgba(200, 169, 110, 0.35));
}

.node-center {
    fill: var(--accent-dark);
}

.node-l2 {
    fill: var(--accent-gold);
}

.node-l3 {
    fill: var(--text-secondary);
    opacity: 0.85;
}

.connection {
    stroke: var(--border);
    fill: none;
    stroke-linecap: round;
}

/* ---------- Spread 4: Rhythm ---------- */
.spread-rhythm {
    background: var(--bg-primary);
    grid-template-columns: 4.6fr 0.2fr 3.2fr;
}

.spread-rhythm .spread-left {
    grid-column: 1 / 2;
    align-items: center;
    justify-content: center;
}

.spread-rhythm .spread-right {
    grid-column: 3 / 4;
    align-items: flex-start;
}

.rhythm-number {
    font-family: var(--serif);
    font-weight: 700;
    color: var(--text-primary);
    font-size: clamp(4rem, 9vw, 9.5rem);
    letter-spacing: -0.04em;
    line-height: 0.9;
    display: flex;
    align-items: baseline;
    justify-content: center;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

#uptime-counter {
    display: inline-block;
    min-width: 7ch;
    text-align: right;
}

.rhythm-number .percent {
    font-size: 0.55em;
    color: var(--accent-gold);
    margin-left: 0.18em;
    font-weight: 400;
    font-style: italic;
}

.rhythm-text {
    max-width: 38ch;
}

.rhythm-text p {
    font-size: clamp(0.98rem, 1.1vw, 1.1rem);
    color: var(--text-body);
}

/* ---------- Spread 5: Materials (dark) ---------- */
.spread-materials {
    background: var(--dark-section);
    grid-template-columns: 1fr;
    color: var(--surface-warm);
    overflow: hidden;
}

.spread-materials .spread-content {
    align-items: center;
    justify-content: center;
}

.materials-title {
    color: var(--bg-primary);
    font-size: clamp(2.4rem, 5vw, 4.5rem);
    text-align: center;
    z-index: 4;
    margin-bottom: 1rem;
    font-style: italic;
    font-weight: 400;
    letter-spacing: -0.02em;
}

.packet-paths {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.packet-path {
    stroke: var(--accent-gold);
    fill: none;
    opacity: 0.3;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.materials-planes {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 2;
    transform-style: preserve-3d;
    transition: transform 0.6s var(--tilt-ease);
}

.plane {
    position: absolute;
    background: rgba(227, 213, 192, 0.06);
    border: 1px solid rgba(212, 200, 181, 0.18);
    border-radius: 2px;
    transition: transform 0.6s var(--tilt-ease);
}

.plane-1 {
    top: 18%;
    left: 10%;
    width: 35%;
    height: 60%;
    transform: rotate(-3deg);
}

.plane-2 {
    top: 28%;
    left: 32%;
    width: 38%;
    height: 50%;
    transform: rotate(2deg);
    background: rgba(200, 169, 110, 0.04);
}

.plane-3 {
    top: 22%;
    right: 8%;
    width: 30%;
    height: 64%;
    transform: rotate(4deg);
}

/* ---------- Spread 6: Closing ---------- */
.spread-closing {
    background: var(--bg-primary);
    grid-template-columns: 1fr;
}

.spread-closing .spread-content {
    align-items: center;
    text-align: center;
}

.closing-text {
    text-align: center;
}

.closing-title {
    font-family: var(--serif);
    font-weight: 700;
    font-size: clamp(3rem, 7vw, 7rem);
    color: var(--text-primary);
    letter-spacing: -0.04em;
    line-height: 0.95;
    margin-bottom: 1.2rem;
}

.closing-subtitle {
    font-family: var(--serif);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1.05rem, 1.5vw, 1.4rem);
    color: var(--text-secondary);
    letter-spacing: 0.01em;
    line-height: 1.3;
}

/* ---------- Navigation Strip ---------- */
.navigation-strip {
    position: fixed;
    top: 50%;
    left: 28px;
    transform: translateY(-50%);
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.6s var(--reveal-ease);
}

.navigation-strip.visible {
    opacity: 1;
    pointer-events: auto;
}

.nav-indicators {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.nav-indicator {
    width: 22px;
    height: 1.5px;
    background: var(--text-tertiary);
    opacity: 0.4;
    cursor: pointer;
    transition: width 0.4s var(--reveal-ease),
                background 0.4s var(--reveal-ease),
                opacity 0.4s var(--reveal-ease);
}

.nav-indicator:hover {
    background: var(--accent-dark);
    opacity: 0.85;
    width: 28px;
}

.nav-indicator.active {
    background: var(--accent-gold);
    width: 36px;
    opacity: 1;
}

/* ---------- Reveal animations within text blocks ---------- */
.spread.in-view .domain-name,
.spread.in-view .closing-title {
    animation: reveal-up 1s var(--reveal-ease) both;
}

.spread.in-view .domain-subtitle,
.spread.in-view .closing-subtitle {
    animation: reveal-up 0.8s var(--reveal-ease) 250ms both;
}

@keyframes reveal-up {
    from { opacity: 0; transform: translateY(28px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Responsive (below 768px) ---------- */
@media (max-width: 768px) {
    .spread {
        grid-template-columns: 1fr !important;
        grid-template-rows: 1fr 1fr;
        padding: clamp(1.5rem, 5vh, 3rem) clamp(1.25rem, 5vw, 2rem);
        gap: 1.5rem;
    }

    .spread-left,
    .spread-right {
        grid-column: 1 / -1 !important;
        align-items: center !important;
        text-align: center;
    }

    .spread-philosophy .spread-left,
    .spread-topology .spread-right,
    .spread-rhythm .spread-left {
        grid-row: 1;
    }

    .spread-philosophy .spread-right,
    .spread-topology .spread-left,
    .spread-rhythm .spread-right {
        grid-row: 2;
    }

    .stack-layers {
        width: min(280px, 80%);
        height: 220px;
    }

    .layer { height: 28px; }
    .layer-2 { top: 36px; }
    .layer-3 { top: 72px; }
    .layer-4 { top: 108px; }
    .layer-5 { top: 144px; }

    .philosophy-text,
    .topology-text,
    .rhythm-text {
        max-width: 100%;
        text-align: left;
    }

    .topology-diagram {
        max-height: 40vh;
    }

    .navigation-strip {
        top: auto;
        bottom: 20px;
        left: 50%;
        transform: translateX(-50%);
    }

    .nav-indicators {
        flex-direction: row;
        gap: 10px;
    }

    .nav-indicator {
        width: 1.5px;
        height: 22px;
    }

    .nav-indicator:hover  { width: 1.5px; height: 28px; }
    .nav-indicator.active { width: 1.5px; height: 36px; }
}

/* Disable tilt-3d on touch devices */
@media (hover: none) {
    .stack-layers,
    .materials-planes,
    .layer,
    .plane {
        transform: none !important;
    }
}