/* ============================================================
   meltdown.quest - Mid-Century Modern Observation Lounge
   ============================================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: #F5F0E8;
    color: #2D4A5A;
    font-family: 'DM Sans', sans-serif;
    font-weight: 400;
    font-size: clamp(0.9rem, 1.05vw, 1rem);
    line-height: 1.75;
    overflow-x: hidden;
}

/* --- Typography --- */
h1, h2, h3 {
    font-family: 'DM Serif Display', serif;
    font-weight: 400;
}

/* --- Observation Deck (Hero Section) --- */
#observation-deck {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #F5F0E8;
    position: relative;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 2rem;
}

.hero-title {
    font-family: 'DM Serif Display', serif;
    font-size: clamp(4rem, 10vw, 8rem);
    color: #2D4A5A;
    letter-spacing: 0.02em;
    opacity: 0;
    transition: opacity 500ms ease;
}

.hero-title.visible {
    opacity: 1;
}

/* Decorative diamond-endpoint SVG rule */
.hero-rule {
    margin: 1rem 0;
    opacity: 0;
    transition: opacity 300ms ease;
}

.hero-rule.visible {
    opacity: 1;
}

.hero-rule svg {
    overflow: visible;
}

.hero-rule .rule-line {
    stroke-dasharray: 272;
    stroke-dashoffset: 272;
    transition: stroke-dashoffset 600ms ease-out;
}

.hero-rule.visible .rule-line {
    stroke-dashoffset: 0;
}

.hero-rule .diamond {
    opacity: 0;
    transition: opacity 300ms ease;
}

.hero-rule.visible .diamond {
    opacity: 1;
}

.hero-subtitle {
    font-family: 'DM Sans', sans-serif;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    font-weight: 300;
    color: #D4644A;
    letter-spacing: 0.05em;
    opacity: 0;
    transition: opacity 500ms ease;
}

.hero-subtitle.visible {
    opacity: 1;
}

/* HUD Ring */
.hud-ring-container {
    position: relative;
    margin-top: 2.5rem;
    width: 160px;
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#hud-ring-svg {
    position: absolute;
    top: 0;
    left: 0;
}

#hud-ring-circle {
    stroke-dasharray: 490;
    stroke-dashoffset: 490;
    transition: stroke-dashoffset 800ms ease-out;
}

#hud-ring-circle.drawn {
    stroke-dashoffset: 0;
}

#hud-ticks line {
    opacity: 0;
    transition: opacity 150ms ease;
}

#hud-ticks line.visible {
    opacity: 0.4;
}

@keyframes hudRotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

#hud-ring-svg.rotating {
    animation: hudRotate 60s linear infinite;
}

.hud-status {
    font-family: 'DM Sans', sans-serif;
    font-weight: 500;
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #8B7B6B;
    position: relative;
    z-index: 1;
    white-space: nowrap;
}

/* --- Section Diamond Divider --- */
.section-diamond-divider {
    display: flex;
    justify-content: center;
    padding: 2.5rem 0 1.5rem;
}

.section-diamond-divider svg rect {
    fill: #D4B078;
}

/* --- Meltdown Grid (Section 2) --- */
#meltdown-grid {
    padding: 2rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

/* Meltdown Card */
.meltdown-card {
    background: #FFFFFF;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(45, 74, 90, 0.08);
    overflow: hidden;
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 300ms ease, transform 300ms ease;
}

.meltdown-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.meltdown-card:hover {
    box-shadow: 0 4px 16px rgba(45, 74, 90, 0.14);
    transition: box-shadow 200ms ease, opacity 300ms ease, transform 300ms ease;
}

.card-header-bar {
    height: 8px;
    background-color: #3D6A7A;
    transform-origin: left center;
    transform: scaleX(0);
    transition: transform 200ms ease-out;
}

.meltdown-card.visible .card-header-bar {
    transform: scaleX(1);
}

.card-body {
    padding: 1.5rem;
}

.card-icon {
    margin-bottom: 1rem;
}

.card-icon svg {
    display: block;
}

.card-title {
    font-family: 'DM Serif Display', serif;
    font-size: clamp(1.3rem, 2vw, 1.8rem);
    color: #2D4A5A;
    margin-bottom: 0.5rem;
}

.card-description {
    font-family: 'DM Sans', sans-serif;
    font-size: clamp(0.9rem, 1.05vw, 1rem);
    color: #8B7B6B;
    line-height: 1.75;
    margin-bottom: 1.25rem;
}

.card-severity {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(45, 74, 90, 0.08);
}

.severity-label {
    font-family: 'DM Sans', sans-serif;
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #8B7B6B;
}

.severity-number {
    font-family: 'DM Serif Display', serif;
    font-size: 2.5rem;
    color: #D4644A;
    line-height: 1;
}

/* High severity highlight */
.severity-number.critical {
    color: #C04030;
}

/* --- Timeline Strip (Section 3) --- */
#timeline-strip {
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    overflow: hidden;
}

.timeline-heading {
    font-family: 'DM Serif Display', serif;
    font-size: clamp(1.3rem, 2vw, 1.8rem);
    color: #2D4A5A;
    margin-bottom: 2rem;
    text-align: center;
    opacity: 0;
    transition: opacity 500ms ease;
}

.timeline-heading.visible {
    opacity: 1;
}

.timeline-container {
    width: 100%;
    max-width: 1000px;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
}

.timeline-svg {
    width: 100%;
    min-width: 700px;
    height: auto;
}

#timeline-line {
    stroke-dasharray: 920;
    stroke-dashoffset: 920;
    transition: stroke-dashoffset 1.5s ease-out;
}

#timeline-line.drawn {
    stroke-dashoffset: 0;
}

.timeline-event circle {
    transform-origin: center;
    transform: scale(0);
    transition: transform 200ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.timeline-event.visible circle {
    transform: scale(1);
}

.timeline-label {
    font-family: 'DM Sans', sans-serif;
    font-weight: 500;
    font-size: 11px;
    letter-spacing: 0.04em;
    fill: #2D4A5A;
    opacity: 0;
    transition: opacity 300ms ease;
}

.timeline-label-below {
    dominant-baseline: hanging;
}

.timeline-event.visible .timeline-label {
    opacity: 1;
}

/* --- Exit Lounge (Footer) --- */
#exit-lounge {
    background-color: #2D4A5A;
    padding: 4rem 2rem 0;
    position: relative;
    overflow: hidden;
}

.footer-content {
    text-align: center;
    padding-bottom: 3rem;
}

.footer-title {
    font-family: 'DM Serif Display', serif;
    font-size: 2rem;
    color: #F5F0E8;
    margin-bottom: 0.75rem;
}

.footer-subtitle {
    font-family: 'DM Sans', sans-serif;
    font-weight: 300;
    font-size: 1rem;
    color: #F5F0E8;
    opacity: 0.6;
    letter-spacing: 0.03em;
}

.footer-diamond-pattern {
    height: 40px;
    overflow: hidden;
}

.footer-diamond-pattern svg {
    display: block;
}

/* --- Responsive Adjustments --- */
@media (max-width: 768px) {
    .grid-container {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    #meltdown-grid {
        padding: 1rem 1rem 3rem;
    }

    .hero-content {
        padding: 1rem;
    }

    .timeline-container {
        padding: 0 1rem;
    }

    #timeline-strip {
        min-height: auto;
        padding: 2rem 0;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: clamp(3rem, 12vw, 4rem);
    }

    .hero-subtitle {
        font-size: clamp(1.2rem, 4vw, 1.5rem);
    }
}