/* ppuzzle.dev :: generative puzzle constructor
   palette
     #0D1117 void / background
     #1A2332 base / grid cell
     #00E676 generative green
     #448AFF generative blue
     #FFB300 generative amber
     #C9D1D9 text primary
     #6E7681 text secondary
   typography
     Space Mono 400 / 700  -- everything monospaced
*/

:root {
    --void: #0D1117;
    --base: #1A2332;
    --green: #00E676;
    --blue: #448AFF;
    --amber: #FFB300;
    --text: #C9D1D9;
    --mute: #6E7681;
    --rule: rgba(201, 209, 217, 0.08);
    --rule-strong: rgba(201, 209, 217, 0.18);
    --code-bg: rgba(0, 0, 0, 0.4);
    --scroll-progress: 0;
    --font-mono: 'Space Mono', 'Inter', ui-monospace, monospace;
}

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

html, body {
    background: var(--void);
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    min-height: 100vh;
    overflow-x: hidden;
    background-image:
        linear-gradient(to right, rgba(110, 118, 129, 0.05) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(110, 118, 129, 0.04) 1px, transparent 1px);
    background-size: 80px 80px;
}

a {
    color: inherit;
    text-decoration: none;
}

em {
    font-style: normal;
    color: var(--green);
}

code {
    font-family: var(--font-mono);
    color: var(--green);
}

/* =========================================================
   GENERATIVE CANVAS  (right 60% of viewport, fixed)
   ========================================================= */

.generative-canvas {
    position: fixed;
    top: 0;
    right: 0;
    width: 60%;
    height: 100vh;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}

.generative-canvas::before {
    /* faint vignette so the grid centers visually */
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(
        circle at 60% 50%,
        rgba(0, 230, 118, 0.05) 0%,
        rgba(68, 138, 255, 0.03) 30%,
        transparent 70%
    );
}

.generative-canvas::after {
    /* corner crosshair / measurement marks */
    content: "+";
    position: absolute;
    top: 24px;
    right: 24px;
    color: var(--mute);
    font-family: var(--font-mono);
    font-size: 18px;
    opacity: 0.5;
}

/* the 10x10 rotating moiré grid */
.grid-rotor {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: grid;
    grid-template-columns: repeat(10, 12px);
    grid-template-rows: repeat(10, 12px);
    gap: 4px;
    padding: 24px;
    border: 1px solid rgba(0, 230, 118, 0.15);
    background: rgba(13, 17, 23, 0.6);
    backdrop-filter: blur(2px);
    filter: hue-rotate(calc(var(--scroll-progress) * 120deg));
    transition: filter 0.4s linear;
}

.grid-rotor::before {
    /* coordinate label top-left */
    content: "lattice[10][10]";
    position: absolute;
    top: -22px;
    left: 0;
    font-size: 11px;
    color: var(--mute);
    letter-spacing: 0.05em;
}

.grid-rotor::after {
    /* coordinate label bottom-right */
    content: attr(data-phase);
    position: absolute;
    bottom: -22px;
    right: 0;
    font-size: 11px;
    color: var(--green);
    letter-spacing: 0.05em;
}

.cell {
    width: 12px;
    height: 12px;
    background: var(--base);
    border: 1px solid rgba(0, 230, 118, 0.2);
    animation: spin var(--duration, 1000ms) linear infinite;
    animation-delay: var(--delay, 0ms);
    transform-origin: center center;
}

.cell.cell-accent-green {
    background: rgba(0, 230, 118, 0.18);
    border-color: rgba(0, 230, 118, 0.6);
}

.cell.cell-accent-blue {
    background: rgba(68, 138, 255, 0.18);
    border-color: rgba(68, 138, 255, 0.6);
}

.cell.cell-accent-amber {
    background: rgba(255, 179, 0, 0.18);
    border-color: rgba(255, 179, 0, 0.6);
}

@keyframes spin {
    0%   { transform: rotate(0deg)   scale(1); }
    50%  { transform: rotate(180deg) scale(0.78); }
    100% { transform: rotate(360deg) scale(1); }
}

/* lissajous curve overlay */
.lissajous {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 360px;
    height: 360px;
    opacity: 0.55;
    pointer-events: none;
    mix-blend-mode: screen;
}

.lissajous path {
    fill: none;
    stroke: var(--green);
    stroke-width: 0.6;
    stroke-linecap: round;
    filter: drop-shadow(0 0 4px rgba(0, 230, 118, 0.4));
}

.lissajous path:nth-child(2) {
    stroke: var(--blue);
    opacity: 0.7;
}

/* dot matrix: radial fade dot grid */
.dot-matrix {
    position: absolute;
    bottom: 6%;
    right: 6%;
    width: 180px;
    height: 180px;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 8px;
    opacity: 0.6;
}

.dot-matrix .dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--green);
    justify-self: center;
    align-self: center;
    transform: scale(var(--dscale, 0.5));
    opacity: var(--dop, 0.3);
}

/* a thin scan-line that advances with scroll progress */
.scan-line {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(var(--scroll-progress) * 100%);
    height: 1px;
    background: linear-gradient(
        to right,
        transparent 0%,
        rgba(0, 230, 118, 0.5) 30%,
        rgba(68, 138, 255, 0.4) 70%,
        transparent 100%
    );
    transform: translateY(-0.5px);
    box-shadow: 0 0 12px rgba(0, 230, 118, 0.4);
}

/* =========================================================
   LEFT RAIL  (fixed sidebar with progress)
   ========================================================= */

.rail {
    position: fixed;
    left: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
    display: flex;
    flex-direction: column;
    gap: 18px;
    width: 120px;
    pointer-events: none;
}

.rail-mark {
    color: var(--mute);
    font-size: 11px;
    letter-spacing: 0.05em;
}

.rail-mark span {
    color: var(--green);
}

.rail-meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
    font-size: 10px;
}

.rail-key {
    color: var(--mute);
    text-transform: lowercase;
}

.rail-val {
    color: var(--text);
}

.rail-bar {
    width: 2px;
    height: 200px;
    background: var(--rule);
    position: relative;
    margin-top: 6px;
}

.rail-bar span {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to bottom, var(--green), var(--blue));
    height: calc(var(--scroll-progress) * 100%);
}

/* =========================================================
   MASTHEAD
   ========================================================= */

.masthead {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 32px;
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--rule);
    font-size: 12px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 700;
    letter-spacing: 0.04em;
}

.brand-glyph {
    color: var(--green);
    font-size: 14px;
}

.nav {
    display: flex;
    gap: 24px;
    color: var(--mute);
}

.nav a {
    transition: color 0.2s ease;
    border-bottom: 1px solid transparent;
}

.nav a:hover {
    color: var(--green);
    border-bottom-color: var(--green);
}

.status-pill {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--mute);
}

.status-pill .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 8px rgba(0, 230, 118, 0.7);
    animation: blink 1.6s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.35; }
}

/* =========================================================
   CONTENT  (left 40% of viewport)
   ========================================================= */

.content {
    position: relative;
    z-index: 10;
    padding: 140px 0 120px 0;
}

.block {
    max-width: 480px;
    margin-left: 8%;
    padding: 80px 0;
    position: relative;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 500ms ease, transform 500ms ease;
}

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

.block-tag {
    color: var(--mute);
    font-size: 11px;
    letter-spacing: 0.06em;
    margin-bottom: 24px;
    text-transform: lowercase;
}

.display {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 44px;
    line-height: 1.15;
    letter-spacing: -0.01em;
    color: var(--text);
    margin-bottom: 32px;
}

.display-line {
    display: block;
}

.display-line:nth-child(2) {
    color: var(--green);
}

.display-line:nth-child(3) {
    color: var(--mute);
}

.heading {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 32px;
    line-height: 1.2;
    color: var(--text);
    margin-bottom: 24px;
    letter-spacing: -0.005em;
}

.heading em {
    display: inline-block;
    font-size: 18px;
    font-weight: 400;
    color: var(--mute);
    margin-top: 6px;
    letter-spacing: 0;
}

.lede {
    font-size: 15px;
    line-height: 1.85;
    color: var(--text);
    margin-bottom: 32px;
}

.body {
    font-size: 14px;
    line-height: 1.85;
    color: var(--text);
    margin-bottom: 24px;
}

/* key/value summary in hero */
.kv {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px 24px;
    border-top: 1px solid var(--rule);
    border-bottom: 1px solid var(--rule);
    padding: 18px 0;
    margin: 32px 0;
    font-size: 12px;
}

.kv > div {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
}

.kv .k {
    color: var(--mute);
}

.kv .v {
    color: var(--green);
}

.hint {
    color: var(--mute);
    font-size: 12px;
    margin-top: 24px;
}

.caret {
    display: inline-block;
    color: var(--green);
    animation: caret 1s steps(2) infinite;
}

@keyframes caret {
    50% { opacity: 0; }
}

/* code blocks */
.code {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.7;
    background: var(--code-bg);
    border-left: 3px solid var(--green);
    padding: 20px;
    margin: 24px 0;
    color: var(--text);
    overflow-x: auto;
    white-space: pre;
    tab-size: 2;
}

.c-com { color: var(--mute); }
.c-key { color: var(--blue); }
.c-num { color: var(--amber); }
.c-str { color: var(--green); }

.formula {
    border-left: 3px solid var(--blue);
    padding: 16px 20px;
    margin: 24px 0;
    background: rgba(68, 138, 255, 0.06);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.fx {
    color: var(--blue);
    font-size: 14px;
    font-weight: 700;
}

.fx-note {
    color: var(--mute);
    font-size: 11px;
}

/* lists */
.list {
    list-style: none;
    margin: 24px 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.list li {
    color: var(--text);
    font-size: 13px;
    display: flex;
    gap: 10px;
}

.list .li-mark {
    color: var(--green);
    flex-shrink: 0;
}

/* legend (color swatches) */
.legend {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin: 24px 0;
    border-top: 1px solid var(--rule);
    border-bottom: 1px solid var(--rule);
    padding: 18px 0;
}

.legend-row {
    display: grid;
    grid-template-columns: 18px 64px 80px 1fr;
    align-items: center;
    gap: 12px;
    font-size: 12px;
}

.swatch {
    width: 14px;
    height: 14px;
    border: 1px solid var(--rule-strong);
}

.s-void  { background: #0D1117; }
.s-base  { background: #1A2332; }
.s-green { background: #00E676; }
.s-blue  { background: #448AFF; }
.s-amber { background: #FFB300; }
.s-text  { background: #C9D1D9; }
.s-mute  { background: #6E7681; }

.legend-name {
    color: var(--text);
}

.legend-hex {
    color: var(--green);
}

.legend-note {
    color: var(--mute);
    font-size: 11px;
}

/* steps (iterate) */
.steps {
    list-style: none;
    margin: 24px 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
    counter-reset: step;
}

.steps li {
    display: grid;
    grid-template-columns: 36px 100px 1fr;
    gap: 16px;
    padding: 14px 0;
    border-top: 1px solid var(--rule);
    align-items: baseline;
}

.steps li:last-child {
    border-bottom: 1px solid var(--rule);
}

.step-no {
    color: var(--mute);
    font-size: 11px;
    font-weight: 700;
}

.step-name {
    color: var(--green);
    font-weight: 700;
    font-size: 13px;
}

.step-desc {
    color: var(--text);
    font-size: 12px;
    line-height: 1.6;
}

/* metrics (iterate) */
.metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-top: 24px;
}

.metric {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 12px;
    border: 1px solid var(--rule);
    background: rgba(26, 35, 50, 0.4);
}

.metric-key {
    color: var(--mute);
    font-size: 10px;
    letter-spacing: 0.06em;
    text-transform: lowercase;
}

.metric-val {
    color: var(--green);
    font-size: 22px;
    font-weight: 700;
    line-height: 1;
}

/* qa (manual) */
.qa {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: 24px 0;
}

.qa-row {
    border-left: 1px solid var(--rule-strong);
    padding-left: 16px;
}

.qa-q {
    color: var(--blue);
    font-size: 13px;
    margin-bottom: 6px;
}

.qa-a {
    color: var(--text);
    font-size: 13px;
    line-height: 1.7;
}

.signoff {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 32px;
    padding-top: 16px;
    border-top: 1px solid var(--rule);
}

.signoff-line {
    color: var(--mute);
    font-size: 11px;
}

.signoff-line:first-child {
    color: var(--green);
}

/* =========================================================
   FOOTER
   ========================================================= */

.footer {
    position: relative;
    z-index: 10;
    margin-top: 60px;
    margin-left: 8%;
    max-width: 480px;
    padding: 32px 0;
    border-top: 1px solid var(--rule);
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px 24px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 11px;
}

.footer-key {
    color: var(--mute);
}

.footer-val {
    color: var(--text);
}

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

@media (max-width: 1024px) {
    .generative-canvas {
        width: 50%;
        opacity: 0.55;
    }
    .grid-rotor {
        grid-template-columns: repeat(10, 10px);
        grid-template-rows: repeat(10, 10px);
        gap: 3px;
    }
    .cell {
        width: 10px;
        height: 10px;
    }
    .rail {
        display: none;
    }
}

@media (max-width: 720px) {
    .nav {
        display: none;
    }
    .status-pill {
        font-size: 11px;
    }
    .generative-canvas {
        width: 100%;
        opacity: 0.18;
    }
    .block {
        margin-left: 6%;
        margin-right: 6%;
        max-width: none;
        padding: 56px 0;
    }
    .footer {
        margin-left: 6%;
        margin-right: 6%;
        max-width: none;
        grid-template-columns: 1fr 1fr;
    }
    .display {
        font-size: 32px;
    }
    .heading {
        font-size: 26px;
    }
    .heading em {
        font-size: 15px;
    }
    .legend-row {
        grid-template-columns: 14px 60px 76px 1fr;
        font-size: 11px;
    }
    .metrics {
        grid-template-columns: repeat(2, 1fr);
    }
}