/* ============================================
   rust.quest - Industrial Forge Compilation Quest
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
    --foundry-black: #1A1714;
    --slag-gray: #2C2822;
    --oxidation-orange: #B7410E;
    --tarnished-copper: #D4A574;
    --phosphor-green: #39FF14;
    --forge-white: #E8E0D4;
    --molten-gold: #C87533;
    --cinder-ash: #6B6156;
    --dark-charcoal: #2C2C2C;
    --blueprint-rule: #3A2A1A;
    --deep-rust: #6B3A2A;
    --saddle-brown: #8B4513;

    --font-display: 'Space Grotesk', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;
    --font-accent: 'Bebas Neue', sans-serif;

    --ease-sharp: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background: var(--foundry-black);
    color: var(--forge-white);
    font-family: var(--font-mono);
    font-size: clamp(0.9rem, 1.1vw, 1.1rem);
    font-weight: 400;
    letter-spacing: 0.01em;
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- SVG Filters (hidden) --- */
.svg-filters {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* --- Grain Overlay --- */
.grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.035;
    mix-blend-mode: overlay;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23g)' opacity='1'/%3E%3C/svg%3E");
    background-repeat: repeat;
    animation: grainShift 30s linear infinite;
}

@keyframes grainShift {
    0%, 100% { transform: translate(0, 0); }
    25% { transform: translate(-2px, 1px); }
    50% { transform: translate(1px, -1px); }
    75% { transform: translate(-1px, 2px); }
}

/* --- Progress Bar --- */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--slag-gray);
    z-index: 10000;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #2C2C2C, var(--oxidation-orange));
    transition: width 0.1s linear;
}

.progress-fill.complete {
    background: var(--oxidation-orange);
    box-shadow: 0 0 12px rgba(183, 65, 14, 0.6);
    animation: progressFlash 0.6s ease-out;
}

@keyframes progressFlash {
    0% { box-shadow: 0 0 30px rgba(183, 65, 14, 1); }
    100% { box-shadow: 0 0 12px rgba(183, 65, 14, 0.6); }
}

.progress-label {
    position: absolute;
    right: 12px;
    top: 6px;
    font-family: var(--font-accent);
    font-size: clamp(0.7rem, 0.9vw, 0.85rem);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--cinder-ash);
    opacity: 0.7;
}

/* --- Blueprint Grid --- */
.blueprint-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    /* Blueprint grid lines in #3A2A1A at 0.06 opacity */
    background-image:
        repeating-linear-gradient(
            90deg,
            #3A2A1A0F 0px,
            #3A2A1A0F 1px,
            transparent 1px,
            transparent calc(100% / 12)
        ),
        repeating-linear-gradient(
            0deg,
            #3A2A1A0F 0px,
            #3A2A1A0F 1px,
            transparent 1px,
            transparent 80px
        );
}

/* --- Phase (Section) Base --- */
.phase {
    position: relative;
    min-height: 100vh;
    z-index: 2;
    overflow: hidden;
}

/* --- Diagonal Cut --- */
.diagonal-cut-top {
    position: absolute;
    top: -2px;
    left: -5%;
    width: 110%;
    height: 60px;
    background: var(--foundry-black);
    transform: rotate(-3deg);
    transform-origin: top left;
    z-index: 3;
}

.diagonal-cut-top::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--oxidation-orange), var(--molten-gold));
    box-shadow: 0 0 15px rgba(183, 65, 14, 0.4), 0 0 30px rgba(183, 65, 14, 0.2);
}

.phase-parsing .diagonal-cut-top {
    background: var(--foundry-black);
}

.phase-borrow .diagonal-cut-top,
.phase-codegen .diagonal-cut-top,
.phase-linking .diagonal-cut-top,
.phase-complete .diagonal-cut-top {
    background: var(--slag-gray);
}

.phase-lexical .diagonal-cut-top {
    background: var(--foundry-black);
}

/* --- Section Inner --- */
.section-inner {
    position: relative;
    z-index: 4;
    padding: 120px 8% 80px;
    max-width: 1400px;
}

/* --- Section Labels --- */
.section-label {
    font-family: var(--font-accent);
    font-size: clamp(0.7rem, 0.9vw, 0.85rem);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--cinder-ash);
    margin-bottom: 60px;
}

/* --- Corten Steel Backgrounds --- */
.corten-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    z-index: 0;
    background:
        radial-gradient(ellipse at 20% 30%, #B7410E59 0%, transparent 60%),
        radial-gradient(ellipse at 80% 60%, #8B45134D 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, #C8753340 0%, transparent 55%),
        radial-gradient(ellipse at 10% 90%, #6B3A2A66 0%, transparent 45%),
        linear-gradient(135deg, var(--foundry-black), var(--slag-gray));
    transition: opacity 1.5s var(--ease-sharp);
}

.corten-bg.visible {
    opacity: 0.4;
}

.corten-full {
    opacity: 0 !important;
}

.corten-full.visible {
    opacity: 1 !important;
}

/* ============================================
   PHASE 0: THE SOURCE (HERO)
   ============================================ */
.phase-hero {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--foundry-black);
    min-height: 100vh;
}

.hero-content {
    position: relative;
    z-index: 5;
    text-align: center;
    padding: 0 5%;
}

.hero-title {
    font-family: var(--font-mono);
    font-weight: 300;
    font-size: clamp(3rem, 9vw, 10rem);
    color: var(--phosphor-green);
    letter-spacing: 0.06em;
    line-height: 1.05;
    transition: font-family 0.4s ease, color 0.8s ease, letter-spacing 0.6s ease;
}

.hero-title.morphed {
    font-family: var(--font-display);
    color: var(--forge-white);
    letter-spacing: -0.02em;
}

.hero-text {
    display: inline;
}

.terminal-cursor {
    display: inline-block;
    color: var(--phosphor-green);
    animation: cursorBlink 1s steps(1) infinite;
    font-weight: 300;
    transition: opacity 2s ease;
}

.terminal-cursor.fade {
    opacity: 0;
}

@keyframes cursorBlink {
    0%, 50% { opacity: 1; }
    50.01%, 100% { opacity: 0; }
}

/* ============================================
   PHASE 1: LEXICAL ANALYSIS
   ============================================ */
.phase-lexical {
    background: linear-gradient(135deg, var(--foundry-black), var(--slag-gray));
}

.token-blocks {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.token-block {
    border-left: 3px solid var(--oxidation-orange);
    padding: 24px 30px;
    position: relative;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--ease-sharp), transform 0.6s var(--ease-sharp);
    max-width: 700px;
    filter: url(#rust-erosion);
}

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

.token-block:nth-child(1) { transition-delay: 0ms; }
.token-block:nth-child(2) { transition-delay: 80ms; }
.token-block:nth-child(3) { transition-delay: 160ms; }
.token-block:nth-child(4) { transition-delay: 240ms; }

.token-label {
    font-family: var(--font-accent);
    font-size: clamp(0.7rem, 0.9vw, 0.85rem);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--oxidation-orange);
    display: block;
    margin-bottom: 12px;
}

.token-text {
    color: var(--forge-white);
    line-height: 1.7;
}

/* ============================================
   PHASE 2: PARSING
   ============================================ */
.phase-parsing {
    background: var(--slag-gray);
}

.parsing-grid {
    position: relative;
}

.circuit-traces {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 1;
}

.circuit-traces svg {
    width: 100%;
    height: 100%;
}

.trace-line {
    fill: none;
    stroke: var(--tarnished-copper);
    stroke-width: 1;
    opacity: 0.15;
    stroke-dasharray: 2000;
    stroke-dashoffset: 2000;
    transition: stroke-dashoffset 3s var(--ease-sharp);
}

.trace-line.drawn {
    stroke-dashoffset: 0;
}

.trace-via {
    fill: var(--tarnished-copper);
    opacity: 0.15;
}

.parse-block {
    position: relative;
    z-index: 2;
    padding: 24px 30px;
    margin-bottom: 30px;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--ease-sharp), transform 0.6s var(--ease-sharp);
    max-width: 600px;
}

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

.parse-left {
    margin-left: 0;
}

.parse-overlap {
    margin-left: 15%;
    margin-top: -20px;
}

.parse-right {
    margin-left: auto;
    margin-right: 0;
    border-left: 3px solid var(--tarnished-copper);
    padding-left: 30px;
    text-align: left;
}

/* ============================================
   PHASE 3: BORROW CHECKING
   ============================================ */
.phase-borrow {
    background: linear-gradient(135deg, var(--slag-gray), var(--foundry-black));
}

.borrow-blocks {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.borrow-block {
    padding: 24px 30px;
    border-left: 3px solid var(--tarnished-copper);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--ease-sharp), transform 0.6s var(--ease-sharp);
    max-width: 700px;
}

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

/* Error block */
.borrow-error {
    border-left-color: var(--oxidation-orange);
    border-left-width: 3px;
    border: 2px solid var(--oxidation-orange);
    background: rgba(183, 65, 14, 0.08);
    position: relative;
    transition: opacity 0.6s var(--ease-sharp), transform 0.6s var(--ease-sharp), border-color 0.8s ease, background 0.8s ease;
}

.borrow-error.shaking {
    animation: borrowShake 0.2s ease-in-out 3;
}

@keyframes borrowShake {
    0%, 100% { transform: translateX(0) translateY(0); }
    25% { transform: translateX(-2px) translateY(1px); }
    75% { transform: translateX(2px) translateY(-1px); }
}

.borrow-error.resolved {
    border-color: var(--phosphor-green);
    background: rgba(57, 255, 20, 0.04);
}

.error-label {
    color: var(--oxidation-orange);
    transition: color 0.8s ease;
}

.error-label.resolved {
    color: var(--phosphor-green);
}

.error-detail {
    color: var(--cinder-ash);
    font-size: 0.85em;
}

/* ============================================
   PHASE 4: CODE GENERATION
   ============================================ */
.phase-codegen {
    background: var(--foundry-black);
}

.code-viewport {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.code-panel {
    background: var(--foundry-black);
    border: 1px solid rgba(183, 65, 14, 0.2);
    padding: 30px;
    border-radius: 0;
    min-width: 500px;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--ease-sharp), transform 0.8s var(--ease-sharp);
}

.code-panel.visible {
    opacity: 1;
    transform: translateY(0);
}

.code-line {
    display: flex;
    align-items: baseline;
    gap: 20px;
    line-height: 2;
    font-family: var(--font-mono);
    font-size: clamp(0.85rem, 1vw, 1rem);
    white-space: pre;
}

.line-num {
    color: var(--cinder-ash);
    user-select: none;
    min-width: 24px;
    text-align: right;
    font-size: 0.85em;
}

.kw {
    color: var(--oxidation-orange);
    font-weight: 600;
}

.fn-name {
    color: var(--forge-white);
}

.tp {
    color: var(--tarnished-copper);
}

.str {
    color: var(--phosphor-green);
}

.comment {
    color: var(--cinder-ash);
    font-style: italic;
}

/* ============================================
   PHASE 5: LINKING
   ============================================ */
.phase-linking {
    background: linear-gradient(135deg, var(--slag-gray), var(--foundry-black));
}

.circuit-traces-converge {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.circuit-traces-converge svg {
    width: 100%;
    height: 100%;
}

.converge {
    stroke-dasharray: 3000;
    stroke-dashoffset: 3000;
    transition: stroke-dashoffset 3s var(--ease-sharp);
}

.converge.drawn {
    stroke-dashoffset: 0;
}

.converge-center {
    fill: var(--phosphor-green);
    opacity: 0;
    transition: opacity 1s ease 2.5s;
}

.converge-center.drawn {
    opacity: 0.6;
}

.link-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    align-items: flex-start;
    justify-content: center;
}

.ghost-block {
    background: rgba(26, 23, 20, 0.6);
    border: 1px solid rgba(212, 165, 116, 0.1);
    padding: 20px 24px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s var(--ease-sharp), transform 0.8s var(--ease-sharp);
    width: calc(50% - 15px);
    min-width: 200px;
}

.ghost-block.visible {
    opacity: 0.15;
    transform: translateY(0);
}

.ghost-block .token-label {
    font-size: 0.7rem;
    color: var(--cinder-ash);
}

.ghost-block .token-text {
    color: var(--cinder-ash);
    font-size: 0.85rem;
}

.link-message {
    width: 100%;
    max-width: 700px;
    text-align: center;
    margin-top: 40px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s var(--ease-sharp) 0.4s, transform 0.8s var(--ease-sharp) 0.4s;
}

.link-message.visible {
    opacity: 1;
    transform: translateY(0);
}

.link-message p {
    color: var(--forge-white);
    line-height: 1.8;
}

/* ============================================
   PHASE 6: BUILD COMPLETE
   ============================================ */
.phase-complete {
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        radial-gradient(ellipse at 20% 30%, #B7410E80 0%, transparent 60%),
        radial-gradient(ellipse at 80% 60%, #8B451373 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, #C8753359 0%, transparent 55%),
        radial-gradient(ellipse at 10% 90%, #6B3A2A80 0%, transparent 45%),
        linear-gradient(135deg, var(--foundry-black), var(--slag-gray));
    min-height: 100vh;
}

.complete-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.build-title {
    font-family: var(--font-accent);
    font-size: clamp(4rem, 12vw, 14rem);
    letter-spacing: 0.3em;
    color: var(--phosphor-green);
    text-shadow: 0 0 40px rgba(57, 255, 20, 0.3);
    line-height: 1;
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 1s var(--ease-sharp), transform 1s var(--ease-sharp), color 2s ease 2s, text-shadow 2s ease 2s;
}

.build-title.visible {
    opacity: 1;
    transform: scale(1);
}

.build-title.settled {
    color: var(--molten-gold);
    text-shadow: 0 0 40px rgba(200, 117, 51, 0.3);
}

.build-subtitle {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: clamp(1rem, 2vw, 1.6rem);
    color: var(--forge-white);
    letter-spacing: 0.04em;
    margin-top: 30px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s var(--ease-sharp) 0.5s, transform 0.8s var(--ease-sharp) 0.5s;
}

.build-subtitle.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .circuit-traces,
    .circuit-traces-converge {
        display: none;
    }

    .section-inner {
        padding: 100px 6% 60px;
    }

    .parse-overlap {
        margin-left: 0;
        margin-top: 0;
    }

    .parse-right {
        margin-left: 0;
    }

    .ghost-block {
        width: 100%;
    }

    .link-content {
        flex-direction: column;
    }

    .build-title {
        letter-spacing: 0.15em;
    }
}

@media (max-width: 640px) {
    .code-viewport {
        overflow-x: scroll;
    }

    .code-panel {
        min-width: 600px;
    }
}

/* --- Selection --- */
::selection {
    background: var(--oxidation-orange);
    color: var(--forge-white);
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--foundry-black);
}

::-webkit-scrollbar-thumb {
    background: var(--slag-gray);
    border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--cinder-ash);
}