/* ============================================================
   soning.stream - Styles
   Reasoning as geological excavation
   ============================================================ */

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

:root {
    --burnt-ember: #c4613a;
    --deep-rust: #8a3a1e;
    --desert-sand: #e8d4c4;
    --charcoal-earth: #2a2420;
    --ochre-warm: #d4a060;
    --ash-gray: #6a6460;
    --raw-canvas: #f0e8de;
}

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

body {
    font-family: 'Work Sans', sans-serif;
    font-weight: 400;
    font-size: clamp(15px, 1.5vw, 18px);
    line-height: 1.8;
    color: var(--charcoal-earth);
    background-color: var(--raw-canvas);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.space-mono {
    font-family: 'Space Mono', monospace;
}

/* --- SVG Grain Filter (hidden) --- */
.grain-svg {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* --- Film Grain Overlay --- */
#grain-overlay {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    filter: url(#grain);
    opacity: 0.06;
    mix-blend-mode: multiply;
    pointer-events: none;
    z-index: 9999;
    animation: grainShift 8s steps(10) infinite;
}

@keyframes grainShift {
    0%, 100% { transform: translate(0, 0); }
    10% { transform: translate(-5%, -10%); }
    20% { transform: translate(-15%, 5%); }
    30% { transform: translate(7%, -25%); }
    40% { transform: translate(-5%, 25%); }
    50% { transform: translate(-15%, 10%); }
    60% { transform: translate(15%, 0%); }
    70% { transform: translate(0%, 15%); }
    80% { transform: translate(3%, 35%); }
    90% { transform: translate(-10%, 10%); }
}

/* --- Particle Container --- */
#particle-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9998;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    will-change: transform, opacity;
}

/* --- Mega Hero Section --- */
#mega-hero {
    position: relative;
    width: 100%;
    height: 150vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

#hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(170deg, var(--burnt-ember) 0%, var(--deep-rust) 60%, #5a2510 100%);
    z-index: 1;
}

#hero-text-container {
    position: relative;
    z-index: 3;
    width: 100%;
    text-align: center;
    overflow: visible;
}

#hero-title {
    font-family: 'Libre Baskerville', serif;
    font-weight: 700;
    font-size: clamp(60px, 12vw, 140px);
    letter-spacing: 0.05em;
    color: transparent;
    background: linear-gradient(
        135deg,
        var(--desert-sand) 0%,
        var(--ochre-warm) 30%,
        var(--raw-canvas) 50%,
        var(--ochre-warm) 70%,
        var(--desert-sand) 100%
    );
    background-size: 300% 300%;
    background-clip: text;
    -webkit-background-clip: text;
    white-space: nowrap;
    transform: scaleX(1.15);
    opacity: 0;
    animation: heroTitleReveal 2s 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards,
               heroTextureShift 20s 3s ease-in-out infinite;
    user-select: none;
}

@keyframes heroTitleReveal {
    0% {
        opacity: 0;
        letter-spacing: 0.2em;
        filter: blur(8px);
    }
    60% {
        filter: blur(0px);
    }
    100% {
        opacity: 1;
        letter-spacing: 0.05em;
        filter: blur(0px);
    }
}

@keyframes heroTextureShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

#hero-line {
    position: absolute;
    top: 55%;
    left: 50%;
    transform: translateX(-50%);
    height: 1px;
    background-color: var(--charcoal-earth);
    opacity: 0.3;
    z-index: 4;
    width: 0%;
    animation: lineExpand 1s 2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes lineExpand {
    0% { width: 0%; }
    100% { width: 80%; }
}

#hero-scroll-indicator {
    position: absolute;
    bottom: 8vh;
    left: 50%;
    transform: translateX(-50%);
    z-index: 5;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    opacity: 0;
    animation: fadeInUp 0.8s 3.5s ease forwards;
}

#hero-scroll-indicator .space-mono {
    font-size: 12px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--desert-sand);
    opacity: 0.6;
}

#scroll-line-anim {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--desert-sand), transparent);
    animation: scrollPulse 2s 4s ease-in-out infinite;
    opacity: 0;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
    50% { opacity: 0.8; transform: scaleY(1); }
}

@keyframes fadeInUp {
    0% { opacity: 0; transform: translateX(-50%) translateY(20px); }
    100% { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* --- Strata Bars --- */
.strata-bar {
    width: 100%;
    height: 50px;
    position: relative;
    overflow: hidden;
}

.strata-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.15;
    filter: url(#grain);
}

.strata-bar-1 {
    background: linear-gradient(90deg, var(--deep-rust), var(--burnt-ember) 40%, var(--deep-rust) 80%, #3a1a0a);
    height: 60px;
}

.strata-bar-2 {
    background: linear-gradient(90deg, #3a1a0a, var(--deep-rust) 30%, var(--burnt-ember) 60%, var(--deep-rust));
    height: 45px;
}

.strata-bar-3 {
    background: linear-gradient(90deg, var(--burnt-ember), #3a1a0a 50%, var(--deep-rust));
    height: 55px;
}

.strata-bar-4 {
    background: linear-gradient(90deg, var(--deep-rust), #3a1a0a 40%, var(--burnt-ember) 70%, #3a1a0a);
    height: 40px;
}

.strata-bar-5 {
    background: linear-gradient(90deg, #3a1a0a, var(--burnt-ember) 20%, var(--deep-rust) 60%, #3a1a0a);
    height: 50px;
}

.strata-bar-6 {
    background: linear-gradient(90deg, var(--deep-rust), var(--burnt-ember) 50%, #3a1a0a);
    height: 60px;
}

/* --- Content Area --- */
#content-area {
    background-color: var(--raw-canvas);
    padding: 0;
}

/* --- Reasoning Sections (Progressive Disclosure) --- */
.reasoning-section {
    background-color: var(--desert-sand);
    border-left: 4px solid var(--burnt-ember);
    margin: 0;
    overflow: hidden;
    transition: background-color 0.3s ease;
}

.reasoning-section:nth-child(odd) {
    background-color: var(--raw-canvas);
}

.section-header {
    display: flex;
    align-items: center;
    padding: 28px 40px;
    cursor: pointer;
    position: relative;
    user-select: none;
    transition: background-color 0.3s ease;
}

.section-header:hover {
    background-color: rgba(196, 97, 58, 0.06);
}

.section-meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-right: 30px;
    min-width: 100px;
}

.section-number {
    font-size: 28px;
    font-weight: 700;
    color: var(--burnt-ember);
    line-height: 1;
}

.section-label {
    font-size: 10px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--ash-gray);
}

.section-title {
    font-family: 'Libre Baskerville', serif;
    font-weight: 700;
    font-size: clamp(28px, 4vw, 48px);
    color: var(--charcoal-earth);
    flex: 1;
    line-height: 1.2;
}

.toggle-btn {
    position: relative;
    width: 36px;
    height: 36px;
    background: none;
    border: 1px solid var(--ash-gray);
    cursor: pointer;
    flex-shrink: 0;
    margin-left: 20px;
    transition: border-color 0.3s ease, transform 0.3s ease;
}

.toggle-btn:hover {
    border-color: var(--burnt-ember);
}

.toggle-line {
    position: absolute;
    background-color: var(--ash-gray);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                background-color 0.3s ease,
                opacity 0.3s ease;
}

.toggle-h {
    width: 16px;
    height: 1.5px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.toggle-v {
    width: 1.5px;
    height: 16px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.reasoning-section.expanded .toggle-v {
    transform: translate(-50%, -50%) rotate(90deg);
    opacity: 0;
}

.reasoning-section.expanded .toggle-btn {
    border-color: var(--burnt-ember);
}

.reasoning-section.expanded .toggle-line {
    background-color: var(--burnt-ember);
}

/* --- Section Content (Progressive Disclosure) --- */
.section-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 600ms cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0 40px;
}

.reasoning-section.expanded .section-content {
    max-height: 2000px;
}

.section-content-inner {
    opacity: 0;
    transition: opacity 300ms 200ms ease;
}

.reasoning-section.expanded .section-content-inner {
    opacity: 1;
}

.section-content p {
    margin-bottom: 1.4em;
    color: var(--charcoal-earth);
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 400ms ease, transform 400ms ease;
    max-width: 720px;
}

.reasoning-section.expanded .section-content p {
    opacity: 1;
    transform: translateY(0);
}

.reasoning-section.expanded .section-content p:nth-child(1) {
    transition-delay: 200ms;
}

.reasoning-section.expanded .section-content p:nth-child(2) {
    transition-delay: 350ms;
}

.reasoning-section.expanded .section-content p:nth-child(3) {
    transition-delay: 500ms;
}

.reasoning-section.expanded .section-content p:nth-child(4) {
    transition-delay: 650ms;
}

.section-content .pull-quote {
    margin: 2em 0;
    padding: 1.5em 0 1.5em 2em;
    border-left: 3px solid var(--burnt-ember);
    opacity: 0;
    transform: translateX(-10px);
    transition: opacity 500ms ease, transform 500ms ease;
}

.reasoning-section.expanded .section-content .pull-quote {
    opacity: 1;
    transform: translateX(0);
    transition-delay: 400ms;
}

.pull-quote p {
    font-family: 'Libre Baskerville', serif;
    font-style: italic;
    font-weight: 400;
    font-size: clamp(16px, 2vw, 22px);
    line-height: 1.6;
    color: var(--deep-rust);
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
}

/* Content bottom padding when expanded */
.reasoning-section.expanded .section-content {
    padding-bottom: 40px;
}

/* --- Footer --- */
#site-footer {
    background-color: var(--charcoal-earth);
    padding: 60px 40px;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.footer-domain {
    font-size: 14px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--burnt-ember);
}

.footer-tagline {
    font-family: 'Libre Baskerville', serif;
    font-style: italic;
    font-size: 14px;
    color: var(--ash-gray);
}

/* --- Scroll-based Hero Parallax (controlled by JS) --- */
#mega-hero.scrolled #hero-title {
    /* JS applies inline transforms */
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .section-header {
        padding: 20px 20px;
        flex-wrap: wrap;
    }

    .section-meta {
        min-width: 60px;
        margin-right: 16px;
    }

    .section-number {
        font-size: 22px;
    }

    .section-content {
        padding: 0 20px;
    }

    .reasoning-section.expanded .section-content {
        padding-bottom: 30px;
    }

    #hero-title {
        transform: scaleX(1.05);
    }

    .strata-bar {
        height: 35px !important;
    }

    #site-footer {
        padding: 40px 20px;
    }

    .pull-quote {
        padding-left: 1.2em !important;
    }

    .section-title {
        font-size: clamp(22px, 5vw, 36px);
    }
}

@media (max-width: 480px) {
    .section-header {
        padding: 16px 16px;
    }

    .section-meta {
        min-width: 50px;
        margin-right: 12px;
    }

    .section-content {
        padding: 0 16px;
    }

    .reasoning-section.expanded .section-content {
        padding-bottom: 24px;
    }

    .toggle-btn {
        width: 30px;
        height: 30px;
        margin-left: 12px;
    }

    .toggle-h {
        width: 12px;
    }

    .toggle-v {
        height: 12px;
    }
}

/* --- Loading State --- */
body.loading #mega-hero {
    opacity: 1;
}

body.loading #hero-gradient {
    opacity: 0;
    animation: heroGradientFade 0.8s ease forwards;
}

@keyframes heroGradientFade {
    0% { opacity: 0; }
    100% { opacity: 1; }
}