/* Color Palette */
:root {
    --color-black: #0A0A0A;
    --color-dark-black: #1A1A1A;
    --color-white: #FFFFFF;
    --color-light-gray: #F5F5F0;
    --color-dark-gray: #4A4A4A;
    --color-mid-gray: #3A3A3A;
    --color-deep-gray: #2A2A2A;
    --color-taupe: #C8C4BC;
    --color-medium-gray: #A0A0A0;
    --color-off-white: #F0F0F0;
    --color-light-off-white: #E0E0E0;
}

/* Typography */
:root {
    --font-display: "Playfair Display", serif;
    --font-body: "Inter", sans-serif;
    --font-mono: "IBM Plex Mono", monospace;
    --font-space: "Space Mono", monospace;
}

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

html, body {
    width: 100%;
    height: 100%;
}

body {
    background-color: var(--color-black);
    color: var(--color-dark-gray);
    font-family: var(--font-body);
    overflow: hidden;
}

/* Viewport Container */
.viewport-container {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    scroll-behavior: smooth;
}

/* Card Stage Base */
.card-stage {
    position: relative;
    width: 100%;
    height: 100vh;
    scroll-snap-align: start;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 1200px;
}

/* Card Background with Generative Art */
.card-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    opacity: 0.12;
    background: radial-gradient(circle at 20% 50%, rgba(170, 170, 170, 0.8) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(120, 120, 120, 0.8) 0%, transparent 50%),
                radial-gradient(circle at 40% 20%, rgba(150, 150, 150, 0.6) 0%, transparent 40%);
    animation: blobPulse 12s ease-in-out infinite;
}

@keyframes blobPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.stats-stage .card-bg,
.data-stage .card-bg {
    background: radial-gradient(circle at 25% 25%, rgba(130, 130, 130, 0.7) 0%, transparent 60%),
                radial-gradient(circle at 75% 75%, rgba(110, 110, 110, 0.7) 0%, transparent 60%),
                conic-gradient(from 0deg at 50% 50%, rgba(140, 140, 140, 0.5) 0deg, rgba(100, 100, 100, 0.5) 120deg, rgba(140, 140, 140, 0.5) 360deg);
    animation: rotatePulse 15s linear infinite;
}

@keyframes rotatePulse {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.archive-stage .card-bg {
    background: radial-gradient(circle 200px at 10% 20%, rgba(100, 100, 100, 0.6) 0%, transparent 50%),
                radial-gradient(circle 150px at 30% 70%, rgba(120, 120, 120, 0.5) 0%, transparent 50%),
                radial-gradient(circle 180px at 80% 50%, rgba(110, 110, 110, 0.5) 0%, transparent 50%),
                radial-gradient(circle 120px at 60% 20%, rgba(130, 130, 130, 0.4) 0%, transparent 50%);
    animation: driftNoise 18s ease-in-out infinite;
}

@keyframes driftNoise {
    0%, 100% {
        transform: translate(0, 0);
    }
    50% {
        transform: translate(20px, -30px);
    }
}

/* Card Content */
.card-content {
    position: relative;
    z-index: 2;
    width: 100%;
    height: 100%;
    padding: clamp(2rem, 8vw, 8rem);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

/* Entry Line Animation */
#entryLine {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--color-white);
    transform: scaleX(0);
    transform-origin: center;
    animation: lineGrow 600ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes lineGrow {
    0% {
        transform: scaleX(0);
    }
    100% {
        transform: scaleX(1);
    }
}

/* Hero Section */
.hero-stage {
    background-color: var(--color-black);
}

.hero-card {
    animation: cardRise 600ms cubic-bezier(0.34, 1.56, 0.64, 1) 400ms backwards;
}

@keyframes cardRise {
    0% {
        opacity: 0;
        transform: translateY(60px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 7rem);
    font-weight: 900;
    letter-spacing: -0.02em;
    color: var(--color-white);
    margin-bottom: 1.5rem;
    line-height: 1;
}

.hero-subtitle {
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.5vw, 1.5rem);
    color: var(--color-taupe);
    font-weight: 400;
    letter-spacing: 0.05em;
}

/* Section Titles */
.section-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    font-weight: 900;
    letter-spacing: -0.02em;
    color: var(--color-white);
    margin-bottom: 3rem;
    line-height: 1;
}

/* Stats Section */
.stats-stage {
    background-color: var(--color-off-white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: clamp(1.5rem, 3vw, 3rem);
    width: 100%;
    max-width: 1000px;
}

.stat-card {
    background-color: var(--color-white);
    padding: clamp(1.5rem, 3vw, 2.5rem);
    border: 2px solid var(--color-dark-gray);
    text-align: center;
    animation: slideUp 600ms cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
    animation-delay: calc(var(--card-index, 0) * 100ms);
}

@keyframes slideUp {
    0% {
        opacity: 0;
        transform: translateY(40px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-number {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 900;
    color: var(--color-black);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-family: var(--font-body);
    font-size: clamp(0.85rem, 1vw, 1rem);
    color: var(--color-dark-gray);
    font-weight: 500;
}

/* Data Visualization Section */
.data-stage {
    background-color: var(--color-light-gray);
}

.data-visualization {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: clamp(1rem, 2vw, 2rem);
}

.material-bar {
    position: relative;
    height: clamp(60px, 8vw, 100px);
    background-color: rgba(255, 255, 255, 0.5);
    border: 2px solid var(--color-dark-gray);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 clamp(1rem, 2vw, 2rem);
    animation: widthExpand 1s cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
    animation-delay: calc(var(--card-index, 0) * 80ms);
}

@keyframes widthExpand {
    0% {
        width: 0;
        opacity: 0;
    }
    100% {
        width: 100%;
        opacity: 1;
    }
}

.material-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: var(--material-width);
    height: 100%;
    background-color: var(--material-color);
    opacity: 0.25;
    z-index: 1;
}

.material-label,
.material-percent {
    position: relative;
    z-index: 2;
    font-family: var(--font-body);
    font-weight: 600;
    color: var(--color-black);
}

.material-label {
    font-size: clamp(1rem, 1.2vw, 1.2rem);
}

.material-percent {
    font-size: clamp(0.9rem, 1.1vw, 1.1rem);
    font-family: var(--font-space);
}

/* Timeline Section */
.timeline-stage {
    background-color: var(--color-off-white);
}

.timeline {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    width: 100%;
    max-width: 1000px;
    position: relative;
    gap: clamp(0.5rem, 1vw, 1rem);
}

.timeline::before {
    content: '';
    position: absolute;
    top: 30px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-dark-gray);
    z-index: 0;
}

.timeline-item {
    flex: 1;
    text-align: center;
    position: relative;
    z-index: 1;
    animation: fadeInUp 600ms cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
    animation-delay: calc(var(--card-index, 0) * 100ms);
}

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

.timeline-year {
    width: 70px;
    height: 70px;
    background-color: var(--color-white);
    border: 3px solid var(--color-dark-gray);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-family: var(--font-space);
    font-size: clamp(0.9rem, 1vw, 1rem);
    font-weight: 700;
    color: var(--color-black);
}

.timeline-item.active .timeline-year {
    background-color: var(--color-black);
    color: var(--color-white);
    font-size: 1.1rem;
}

.timeline-event {
    font-family: var(--font-body);
    font-size: clamp(0.85rem, 1vw, 1rem);
    color: var(--color-dark-gray);
    font-weight: 500;
}

/* Regional Section */
.regional-stage {
    background-color: var(--color-light-gray);
}

.regional-data {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: clamp(1.5rem, 2.5vw, 2.5rem);
    width: 100%;
    max-width: 1000px;
}

.region-card {
    background-color: var(--color-white);
    padding: clamp(1.5rem, 2.5vw, 2.5rem);
    border: 2px solid var(--color-dark-gray);
    text-align: center;
    animation: scaleIn 500ms cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
    animation-delay: calc(var(--card-index, 0) * 80ms);
}

@keyframes scaleIn {
    0% {
        opacity: 0;
        transform: scale(0.9);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.region-name {
    font-family: var(--font-body);
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    font-weight: 600;
    color: var(--color-dark-gray);
    margin-bottom: 0.5rem;
}

.region-score {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    color: var(--color-black);
    line-height: 1;
    margin: 0.5rem 0;
}

.region-detail {
    font-family: var(--font-body);
    font-size: clamp(0.8rem, 0.9vw, 0.9rem);
    color: var(--color-medium-gray);
    font-weight: 400;
}

/* Certification Section */
.certification-stage {
    background-color: var(--color-off-white);
}

.certification-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: clamp(1rem, 1.5vw, 1.5rem);
    width: 100%;
    max-width: 900px;
}

.cert-badge {
    background-color: var(--color-white);
    border: 2px solid var(--color-dark-gray);
    padding: clamp(1rem, 2vw, 1.5rem);
    font-family: var(--font-space);
    font-size: clamp(0.8rem, 0.95vw, 0.95rem);
    font-weight: 600;
    color: var(--color-black);
    text-align: center;
    animation: popIn 400ms cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
    animation-delay: calc(var(--card-index, 0) * 50ms);
}

@keyframes popIn {
    0% {
        opacity: 0;
        transform: scale(0.5);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* Archive Section */
.archive-stage {
    background-color: var(--color-light-gray);
}

.archive-list {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: clamp(1rem, 1.5vw, 1.5rem);
}

.archive-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--color-white);
    padding: clamp(1.5rem, 2vw, 2rem);
    border-left: 4px solid var(--color-dark-gray);
    animation: slideInLeft 500ms cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
    animation-delay: calc(var(--card-index, 0) * 80ms);
}

@keyframes slideInLeft {
    0% {
        opacity: 0;
        transform: translateX(-40px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

.archive-date {
    font-family: var(--font-space);
    font-size: clamp(0.85rem, 1vw, 1rem);
    font-weight: 600;
    color: var(--color-dark-gray);
}

.archive-title {
    font-family: var(--font-body);
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    color: var(--color-black);
    font-weight: 500;
}

/* Methodology Section */
.methodology-stage {
    background-color: var(--color-off-white);
}

.methodology-text {
    width: 100%;
    max-width: 800px;
    text-align: left;
}

.methodology-text p {
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.15vw, 1.15rem);
    line-height: 1.75;
    color: var(--color-dark-gray);
    margin-bottom: clamp(1.5rem, 2vw, 2rem);
    animation: fadeInText 600ms cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
    animation-delay: calc(var(--card-index, 0) * 100ms);
}

@keyframes fadeInText {
    0% {
        opacity: 0;
        transform: translateY(10px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.methodology-text p:last-child {
    margin-bottom: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .card-content {
        padding: clamp(1rem, 5vw, 2rem);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .regional-data {
        grid-template-columns: repeat(2, 1fr);
    }

    .certification-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .timeline {
        flex-direction: column;
        gap: 2rem;
    }

    .timeline::before {
        display: none;
    }

    .timeline-year {
        width: 60px;
        height: 60px;
    }
}

@media (max-width: 480px) {
    .card-content {
        padding: 1rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .regional-data {
        grid-template-columns: 1fr;
    }

    .certification-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-title {
        font-size: clamp(2rem, 6vw, 3rem);
    }

    .section-title {
        font-size: clamp(1.8rem, 4vw, 2.5rem);
    }
}

/* Focus and interaction states */
.stat-card:hover,
.region-card:hover,
.cert-badge:hover,
.archive-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

/* Text selection */
::selection {
    background-color: var(--color-dark-gray);
    color: var(--color-white);
}