/* =====================================================================
   logical.day v2 -- translucent frost, broken grid, swiss-precision
   ===================================================================== */

:root {
    /* Palette -- translucent-frost */
    --platinum-mist: #eef0f3;
    --frost-fill: rgba(255, 255, 255, 0.42);
    --frost-fill-strong: rgba(255, 255, 255, 0.62);
    --frost-border: rgba(255, 255, 255, 0.7);
    --cool-ink: #1c2540;
    --soft-ink: #4a5168;
    --bokeh-teal: #b9e3df;
    --bokeh-lavender: #d6cef2;
    --bokeh-pearl: #f3ede2;
    --crystalline: #7e9ab8;
    --reveal-highlight: #5d7c9a;
    --card-shadow: rgba(20, 30, 60, 0.08);
    --card-shadow-strong: rgba(20, 30, 60, 0.14);

    /* Type stacks */
    --font-display: "Fraunces", "Lora", Georgia, serif;
    --font-body: "Inter", "Helvetica Neue", Arial, sans-serif;
    --font-mono: "JetBrains Mono", "Fira Code", "Menlo", monospace;

    /* Rhythm */
    --rhythm: 8px;

    /* Easing */
    --ease-glide: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-text-size-adjust: 100%;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--platinum-mist);
    color: var(--cool-ink);
    font-family: var(--font-body);
    font-weight: 420;
    font-size: clamp(15px, 1.4vw, 18px);
    line-height: 1.7;
    letter-spacing: 0.005em;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* Subtle ambient gradient on top of platinum mist */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        radial-gradient(120% 80% at 80% 10%, rgba(185, 227, 223, 0.18), transparent 60%),
        radial-gradient(100% 90% at 10% 90%, rgba(214, 206, 242, 0.16), transparent 65%);
    z-index: 0;
    pointer-events: none;
}

/* ---------- Bokeh field (drifting halos) ---------- */
.bokeh-field {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.bokeh {
    position: absolute;
    width: 46vw;
    height: 46vw;
    max-width: 760px;
    max-height: 760px;
    min-width: 320px;
    min-height: 320px;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    will-change: transform;
}

.bokeh-teal {
    background: radial-gradient(circle at 50% 50%, var(--bokeh-teal) 0%, rgba(185, 227, 223, 0) 70%);
    top: -10vh;
    left: -8vw;
}

.bokeh-lavender {
    background: radial-gradient(circle at 50% 50%, var(--bokeh-lavender) 0%, rgba(214, 206, 242, 0) 70%);
    top: 30vh;
    left: 60vw;
}

.bokeh-pearl {
    background: radial-gradient(circle at 50% 50%, var(--bokeh-pearl) 0%, rgba(243, 237, 226, 0) 70%);
    top: 110vh;
    left: 10vw;
}

.bokeh-teal-2 {
    background: radial-gradient(circle at 50% 50%, var(--bokeh-teal) 0%, rgba(185, 227, 223, 0) 70%);
    top: 220vh;
    left: 55vw;
    opacity: 0.32;
}

/* ---------- Faint grid overlay (broken-grid hint) ---------- */
.grid-overlay {
    position: fixed;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background-image:
        linear-gradient(to right,
            rgba(28, 37, 64, 0.025) 1px,
            transparent 1px);
    background-size: calc(100% / 12) 100%;
    background-position: 0 0;
    opacity: 0.6;
}

/* ---------- Site container ---------- */
.site {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1480px;
    margin: 0 auto;
    padding: 0 clamp(24px, 4vw, 72px);
}

/* ---------- Frost panel base ---------- */
.frost-panel {
    background: var(--frost-fill);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    border: 1px solid var(--frost-border);
    box-shadow:
        0 24px 48px var(--card-shadow),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
    border-radius: 2px;
    transition:
        transform 280ms var(--ease-glide),
        backdrop-filter 280ms var(--ease-glide),
        -webkit-backdrop-filter 280ms var(--ease-glide),
        box-shadow 280ms var(--ease-glide);
}

/* ---------- Section headers ---------- */
.section-header {
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: clamp(16px, 2.4vw, 32px);
    row-gap: 8px;
    align-items: baseline;
    margin-bottom: clamp(48px, 6vw, 88px);
    padding-top: clamp(16px, 2vw, 32px);
}

.section-tag {
    color: var(--crystalline);
    font-size: 14px;
    letter-spacing: 0.08em;
    text-transform: lowercase;
    grid-row: 1;
    grid-column: 1;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(28px, 3.5vw, 56px);
    font-weight: 320;
    font-variation-settings: "opsz" 96, "wght" 320, "SOFT" 30;
    line-height: 1.05;
    letter-spacing: -0.015em;
    color: var(--cool-ink);
    grid-row: 1;
    grid-column: 2;
}

.section-lede {
    grid-row: 2;
    grid-column: 2;
    color: var(--soft-ink);
    font-size: clamp(15px, 1.3vw, 17px);
    max-width: 52ch;
}

/* ---------- Mono helper ---------- */
.mono {
    font-family: var(--font-mono);
    font-feature-settings: "tnum" 1, "ss01" 1;
}

.small-caps {
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font-size: 11px;
}

/* =====================================================================
   HERO
   ===================================================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: clamp(72px, 9vw, 144px) 0 clamp(56px, 7vw, 96px);
    position: relative;
}

.hero-grid {
    position: relative;
    width: 100%;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    column-gap: clamp(8px, 1.2vw, 16px);
    row-gap: clamp(24px, 3vw, 48px);
    align-items: end;
}

.hero-title {
    grid-column: 1 / span 9;
    font-family: var(--font-display);
    font-size: clamp(64px, 12vw, 180px);
    font-weight: 220;
    font-variation-settings: "opsz" 144, "wght" 220, "SOFT" 30;
    line-height: 0.92;
    letter-spacing: -0.04em;
    color: var(--cool-ink);
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    margin-left: -0.04em;
}

.hero-title .letter {
    display: inline-block;
    font-variation-settings: "opsz" 144, "wght" 100, "SOFT" 30;
    transform: translateY(12px);
    opacity: 0;
    animation: letter-in 700ms var(--ease-glide) forwards;
    animation-delay: calc(var(--i) * 80ms);
    will-change: transform, font-variation-settings, opacity;
}

@keyframes letter-in {
    0% {
        font-variation-settings: "opsz" 144, "wght" 100, "SOFT" 30;
        transform: translateY(12px);
        opacity: 0;
    }
    100% {
        font-variation-settings: "opsz" 144, "wght" 220, "SOFT" 30;
        transform: translateY(0);
        opacity: 1;
    }
}

.hero-panel {
    grid-column: 8 / span 5;
    grid-row: 1;
    align-self: end;
    padding: clamp(28px, 3vw, 44px) clamp(28px, 3vw, 44px);
    transform: translateX(40px);
    opacity: 0;
    -webkit-backdrop-filter: blur(0);
    backdrop-filter: blur(0);
    animation: panel-slide-in 800ms var(--ease-glide) 220ms forwards;
    margin-bottom: clamp(8px, 1.2vw, 16px);
}

@keyframes panel-slide-in {
    0% {
        transform: translateX(40px);
        opacity: 0;
        -webkit-backdrop-filter: blur(0);
        backdrop-filter: blur(0);
    }
    100% {
        transform: translateX(0);
        opacity: 1;
        -webkit-backdrop-filter: blur(18px);
        backdrop-filter: blur(18px);
    }
}

.hero-panel-eyebrow {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--crystalline);
    letter-spacing: 0.08em;
    margin-bottom: 14px;
}

.hero-panel-text {
    font-family: var(--font-display);
    font-size: clamp(18px, 1.8vw, 24px);
    font-weight: 380;
    font-variation-settings: "opsz" 36, "wght" 380, "SOFT" 30;
    line-height: 1.45;
    color: var(--cool-ink);
    margin-bottom: 18px;
}

.hero-panel-meta {
    color: var(--soft-ink);
    font-size: 14px;
    line-height: 1.4;
}

.hero-panel-meta .mono {
    color: var(--crystalline);
    margin-right: 8px;
    font-size: 16px;
}

.hero-shard {
    grid-column: 2 / span 1;
    grid-row: 2;
    align-self: start;
    transform: translateY(-32px);
    opacity: 0;
    animation: fade-up 600ms var(--ease-glide) 700ms forwards;
}

.hero-meta {
    grid-column: 4 / span 6;
    grid-row: 2;
    align-self: center;
    color: var(--soft-ink);
    opacity: 0;
    animation: fade-up 600ms var(--ease-glide) 800ms forwards;
}

@keyframes fade-up {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---------- Crystalline shards ---------- */
.shard {
    display: inline-block;
    background: linear-gradient(135deg, var(--crystalline) 0%, var(--reveal-highlight) 100%);
    box-shadow: 0 4px 12px rgba(126, 154, 184, 0.35);
    transition: transform 280ms var(--ease-glide);
}

.shard-rhombus {
    width: 18px;
    height: 18px;
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}

.shard-hex {
    width: 22px;
    height: 22px;
    clip-path: polygon(25% 5%, 75% 5%, 100% 50%, 75% 95%, 25% 95%, 0% 50%);
}

.shard-tri {
    width: 14px;
    height: 22px;
    clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
}

/* =====================================================================
   PREMISES (broken-grid)
   ===================================================================== */

.premises {
    padding: clamp(72px, 9vw, 144px) 0;
    position: relative;
}

.premise-grid {
    position: relative;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    column-gap: clamp(8px, 1.2vw, 16px);
    row-gap: clamp(48px, 6vw, 88px);
    align-items: start;
    min-height: 420px;
}

.premise-card {
    grid-column: var(--col-start) / var(--col-end);
    margin-top: var(--card-offset);
    padding: clamp(28px, 3vw, 44px);
    position: relative;
    cursor: default;
    opacity: 0;
    transform: translateY(20px);
    transition:
        transform 320ms var(--ease-glide),
        backdrop-filter 320ms var(--ease-glide),
        -webkit-backdrop-filter 320ms var(--ease-glide),
        box-shadow 320ms var(--ease-glide),
        opacity 600ms var(--ease-glide);
}

.premise-card.is-revealed {
    opacity: 1;
    transform: translateY(0);
}

.premise-card:hover {
    transform: translateY(-8px);
    -webkit-backdrop-filter: blur(24px);
    backdrop-filter: blur(24px);
    background: var(--frost-fill-strong);
    box-shadow:
        0 32px 64px var(--card-shadow-strong),
        inset 0 0 0 1px rgba(255, 255, 255, 0.92);
}

.premise-card:hover .card-shard {
    transform: rotate(12deg) scale(1.1);
}

.premise-card:hover .card-rule {
    color: var(--reveal-highlight);
}

.card-number {
    display: block;
    color: var(--crystalline);
    font-size: 12px;
    letter-spacing: 0.16em;
    margin-bottom: 18px;
}

.card-title {
    font-family: var(--font-display);
    font-size: clamp(26px, 2.6vw, 38px);
    font-weight: 360;
    font-variation-settings: "opsz" 72, "wght" 360, "SOFT" 30;
    line-height: 1.1;
    letter-spacing: -0.012em;
    color: var(--cool-ink);
    margin-bottom: 16px;
}

.card-body {
    color: var(--soft-ink);
    font-size: clamp(14px, 1.15vw, 16px);
    line-height: 1.7;
    margin-bottom: 24px;
}

.card-rule {
    display: inline-block;
    color: var(--crystalline);
    font-size: 13px;
    padding: 6px 10px;
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(126, 154, 184, 0.25);
    border-radius: 2px;
    transition: color 280ms var(--ease-glide);
}

.card-shard {
    position: absolute;
    top: 22px;
    right: 22px;
    width: 16px;
    height: 16px;
    background: linear-gradient(135deg, var(--crystalline), var(--reveal-highlight));
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    transition: transform 320ms var(--ease-glide);
    box-shadow: 0 3px 10px rgba(126, 154, 184, 0.4);
}

/* =====================================================================
   REVEAL (slide-reveal)
   ===================================================================== */

.reveal {
    padding: clamp(72px, 9vw, 144px) 0;
    position: relative;
}

.reveal-band {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    column-gap: clamp(8px, 1.2vw, 16px);
    row-gap: clamp(20px, 2.4vw, 32px);
    margin-bottom: clamp(32px, 4vw, 56px);
}

.reveal-slab {
    padding: clamp(28px, 3vw, 40px) clamp(28px, 3.4vw, 56px);
    opacity: 0;
    transform: translateY(24px);
    -webkit-backdrop-filter: blur(0);
    backdrop-filter: blur(0);
    transition:
        opacity 600ms var(--ease-glide),
        transform 600ms var(--ease-glide),
        backdrop-filter 600ms var(--ease-glide),
        -webkit-backdrop-filter 600ms var(--ease-glide);
    position: relative;
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: clamp(20px, 2.4vw, 36px);
    align-items: baseline;
}

.reveal-slab[data-step="1"] { grid-column: 2 / span 8; }
.reveal-slab[data-step="2"] { grid-column: 5 / span 6; }
.reveal-slab[data-step="3"] { grid-column: 3 / span 9; }

.reveal-slab.is-in {
    opacity: 1;
    transform: translateY(0);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
}

.slab-tag {
    color: var(--crystalline);
    font-size: 12px;
    letter-spacing: 0.16em;
    text-transform: lowercase;
    align-self: center;
    min-width: 92px;
}

.slab-text {
    font-family: var(--font-display);
    font-size: clamp(24px, 3vw, 44px);
    font-weight: 320;
    font-variation-settings: "opsz" 96, "wght" 320, "SOFT" 30;
    line-height: 1.2;
    color: var(--cool-ink);
    letter-spacing: -0.012em;
}

.atom {
    color: var(--reveal-highlight);
    font-weight: 500;
    padding: 0 4px;
}

.reveal-slab-final {
    overflow: hidden;
}

.reveal-slab-final .slab-text {
    color: var(--reveal-highlight);
}

.reveal-bloom {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(60% 80% at 80% 50%, rgba(185, 227, 223, 0.55) 0%, rgba(185, 227, 223, 0) 70%);
    transform: scale(0);
    opacity: 0;
    transition: transform 800ms var(--ease-glide), opacity 800ms var(--ease-glide);
    z-index: -1;
}

.reveal-slab-final.is-in .reveal-bloom {
    transform: scale(1);
    opacity: 1;
}

.reveal-caption {
    text-align: center;
    color: var(--soft-ink);
    font-size: clamp(13px, 1.1vw, 15px);
}

.reveal-caption .mono {
    color: var(--crystalline);
    margin-right: 8px;
}

/* =====================================================================
   WORKED EXAMPLE
   ===================================================================== */

.worked {
    padding: clamp(72px, 9vw, 144px) 0;
    position: relative;
}

.worked-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    column-gap: clamp(8px, 1.2vw, 16px);
    row-gap: clamp(28px, 3vw, 48px);
    counter-reset: worked;
}

.worked-line {
    grid-column: var(--col-start) / var(--col-end);
    display: grid;
    grid-template-columns: auto auto 1fr;
    align-items: baseline;
    column-gap: clamp(14px, 1.8vw, 28px);
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    transition:
        opacity 600ms var(--ease-glide),
        transform 600ms var(--ease-glide);
}

.worked-line.is-in {
    opacity: 1;
    transform: translateY(0);
}

.worked-marker {
    width: 12px;
    height: 12px;
    background: var(--crystalline);
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    margin-top: 14px;
    box-shadow: 0 2px 8px rgba(126, 154, 184, 0.4);
}

.worked-marker-bright {
    background: linear-gradient(135deg, var(--reveal-highlight), var(--crystalline));
    width: 16px;
    height: 16px;
}

.worked-tag {
    color: var(--crystalline);
    font-size: 13px;
    letter-spacing: 0.12em;
    align-self: center;
    min-width: 38px;
}

.worked-line-final .worked-tag {
    color: var(--reveal-highlight);
    font-size: 18px;
}

.worked-text {
    font-family: var(--font-display);
    font-size: clamp(20px, 2.2vw, 32px);
    font-weight: 320;
    font-variation-settings: "opsz" 72, "wght" 320, "SOFT" 30;
    line-height: 1.32;
    color: var(--cool-ink);
}

.worked-line-final {
    margin-top: 12px;
}

.worked-line-final .worked-text {
    color: var(--reveal-highlight);
    font-weight: 380;
    font-variation-settings: "opsz" 72, "wght" 380, "SOFT" 30;
}

.qed-panel {
    grid-column: 3 / -1;
    margin-top: 18px;
    padding: 14px 22px;
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.04em;
    color: var(--soft-ink);
    align-self: start;
    justify-self: start;
}

/* =====================================================================
   CLOSING
   ===================================================================== */

.closing {
    min-height: 70vh;
    padding: clamp(96px, 12vw, 192px) 0 clamp(72px, 9vw, 144px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
}

.closing-cluster {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 48px;
    transform: translateY(0);
    animation: cluster-float 7s ease-in-out infinite;
}

.closing-cluster .shard-rhombus {
    width: 22px;
    height: 22px;
}

.closing-cluster .shard-hex {
    width: 28px;
    height: 28px;
    transform: translateY(-8px);
}

.closing-cluster .shard-tri {
    width: 16px;
    height: 24px;
    transform: translateY(6px);
}

@keyframes cluster-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.closing-text {
    font-family: var(--font-display);
    font-size: clamp(24px, 3vw, 42px);
    font-weight: 320;
    font-variation-settings: "opsz" 96, "wght" 320, "SOFT" 30;
    color: var(--cool-ink);
    letter-spacing: -0.012em;
    margin-bottom: 28px;
}

.closing-rule {
    display: block;
    width: 60%;
    max-width: 520px;
    height: 1px;
    background: linear-gradient(
        to right,
        rgba(126, 154, 184, 0) 0%,
        rgba(126, 154, 184, 0.5) 50%,
        rgba(126, 154, 184, 0) 100%
    );
    margin-bottom: 24px;
}

.closing-credit {
    color: var(--crystalline);
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: lowercase;
}

/* =====================================================================
   RESPONSIVE
   ===================================================================== */

@media (max-width: 900px) {
    .hero-title {
        grid-column: 1 / -1;
    }

    .hero-panel {
        grid-column: 1 / -1;
        align-self: start;
    }

    .hero-shard {
        grid-column: 1 / span 2;
    }

    .hero-meta {
        grid-column: 3 / -1;
    }

    .premise-card,
    .reveal-slab,
    .worked-line {
        grid-column: 1 / -1 !important;
        margin-top: 0 !important;
    }

    .reveal-slab {
        grid-template-columns: 1fr;
        row-gap: 12px;
    }

    .worked-line {
        grid-template-columns: auto auto 1fr;
    }

    .qed-panel {
        grid-column: 1 / -1;
    }

    .grid-overlay {
        background-size: calc(100% / 6) 100%;
    }
}

@media (max-width: 540px) {
    body {
        font-size: 15px;
    }

    .hero-title {
        font-size: clamp(56px, 16vw, 84px);
    }

    .closing-cluster {
        gap: 10px;
    }
}

/* Reduced motion override */
@media (prefers-reduced-motion: reduce) {
    .hero-title .letter,
    .hero-panel,
    .hero-shard,
    .hero-meta,
    .premise-card,
    .reveal-slab,
    .worked-line,
    .closing-cluster {
        animation: none !important;
        transition: none !important;
        opacity: 1 !important;
        transform: none !important;
    }

    .reveal-slab {
        -webkit-backdrop-filter: blur(20px);
        backdrop-filter: blur(20px);
    }
}