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

:root {
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-primary: #2c3e50;
    --color-secondary: #34495e;
    --color-accent: #3498db;
    --color-text: #2c3e50;
    --color-text-light: #7f8c8d;
    --color-border: #e0e0e0;
    --color-hover: #f5f5f5;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    font-size: 16px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-primary);
    letter-spacing: -0.5px;
    flex: 1;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
}

.lang-toggle:hover {
    background: var(--color-hover);
    border-color: var(--color-accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.lang-icon {
    font-size: 1.2rem;
}

/* Main Content */
.main {
    padding: 3rem 0 4rem;
}

.section {
    background: var(--color-surface);
    border-radius: 12px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    opacity: 0;
    animation: fadeIn 0.6s ease forwards;
}

.section:nth-child(even) {
    animation-delay: 0.1s;
}

.section:nth-child(odd) {
    animation-delay: 0.2s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--color-primary);
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--color-border);
}

.subsection-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin: 2rem 0 1rem;
    color: var(--color-secondary);
}

.section-text {
    font-size: 1.05rem;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* Table of Contents */
.toc {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin-top: 1rem;
}

.toc-item {
    padding: 12px 18px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    text-decoration: none;
    color: var(--color-text);
    transition: var(--transition);
    font-weight: 500;
    text-align: center;
}

.toc-item:hover {
    background: var(--color-accent);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

/* Terminology */
.terminology-list {
    margin-top: 1rem;
}

.term-item {
    padding: 1.5rem;
    background: var(--color-bg);
    border-left: 3px solid var(--color-accent);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.term-name {
    font-size: 1.1rem;
    color: var(--color-primary);
    display: block;
    margin-bottom: 0.5rem;
}

.term-desc {
    color: var(--color-text-light);
    margin-left: 1rem;
}

/* Text Content */
.text-content p {
    margin-bottom: 1.2rem;
    text-align: justify;
    text-justify: inter-character;
}

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

/* Roadmap */
.roadmap {
    list-style: none;
    counter-reset: roadmap;
    margin-top: 1rem;
}

.roadmap li {
    counter-increment: roadmap;
    padding: 1rem 1.5rem;
    background: var(--color-bg);
    border-radius: 8px;
    margin-bottom: 0.75rem;
    position: relative;
    padding-left: 3.5rem;
    transition: var(--transition);
}

.roadmap li:hover {
    background: var(--color-hover);
    transform: translateX(4px);
}

.roadmap li::before {
    content: counter(roadmap);
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    background: var(--color-accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

.roadmap li.roadmap-current {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    border: 2px solid var(--color-accent);
    font-weight: 500;
    box-shadow: var(--shadow-md);
}

.roadmap li.roadmap-current::before {
    background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.2);
    animation: pulse 2s ease-in-out infinite;
}

.roadmap li.roadmap-current::after {
    content: '\1F4CD';
    position: absolute;
    left: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    animation: pinBounce 1s ease-in-out infinite;
}

@keyframes pinBounce {

    0%,
    100% {
        transform: translateY(-50%);
    }

    50% {
        transform: translateY(-60%);
    }
}

@keyframes pulse {

    0%,
    100% {
        box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.2);
    }

    50% {
        box-shadow: 0 0 0 6px rgba(33, 150, 243, 0.1);
    }
}

.current-badge {
    display: inline-block;
    margin-left: 0.75rem;
    padding: 3px 10px;
    background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
    color: white;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 4px rgba(33, 150, 243, 0.3);
}

/* Measurement Blocks */
.measurement-block {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid var(--color-border);
}

.measurement-block:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

/* Data Sections */
.data-section {
    margin-top: 2rem;
}

.data-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    color: var(--color-secondary);
}

.data-subtitle {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 1.5rem 0 1rem;
    color: var(--color-text);
}

.data-description,
.data-note {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    background: var(--color-bg);
    border-radius: 6px;
}

.data-note {
    border-left: 3px solid var(--color-accent);
}

/* Data Items */
.data-item {
    margin-bottom: 1.5rem;
    padding: 1.25rem;
    background: var(--color-bg);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.data-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.data-date {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    padding: 4px 10px;
    background: var(--color-primary);
    color: white;
    border-radius: 4px;
    font-weight: 500;
}

.data-location,
.data-type {
    font-size: 0.9rem;
    padding: 4px 10px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-light);
}

.data-badge {
    font-size: 0.85rem;
    padding: 4px 10px;
    background: var(--color-accent);
    color: white;
    border-radius: 4px;
    font-weight: 500;
}

.data-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* Buttons */
.btn-expand,
.btn-link {
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    display: inline-block;
}

.btn-expand:hover,
.btn-link:hover {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-link {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.btn-link:hover {
    background: var(--color-secondary);
    border-color: var(--color-secondary);
}

/* Code & Data Blocks */
.code-block-container {
    margin-top: 1rem;
}

.code-block,
.data-block {
    margin-top: 1rem;
    padding: 1.5rem;
    background: #282c34;
    color: #abb2bf;
    border-radius: 8px;
    overflow-x: auto;
    font-family: 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(0, 0, 0, 0.1);
    white-space: pre;
    tab-size: 4;
}

.json-block {
    color: #e06c75;
}

/* Syntax highlighting styles */
.code-block .keyword {
    color: #c678dd;
    font-weight: 600;
}

.code-block .string {
    color: #98c379;
}

.code-block .number {
    color: #d19a66;
}

.code-block .function {
    color: #61afef;
}

.code-block .comment {
    color: #5c6370;
    font-style: italic;
}

.code-block .operator {
    color: #56b6c2;
}

.code-block .variable {
    color: #e06c75;
}

.table-block {
    background: var(--color-surface);
    color: var(--color-text);
    padding: 0;
    overflow-x: auto;
}

.table-block table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.table-block th,
.table-block td {
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    text-align: left;
}

.table-block th {
    background: var(--color-bg);
    font-weight: 600;
    position: sticky;
    top: 0;
}

.table-block tr:hover {
    background: var(--color-hover);
}

/* Charts */
.chart-container {
    margin: 2rem 0;
    padding: 1rem;
    background: var(--color-surface);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    position: relative;
    min-height: 400px;
}

.chart-container canvas {
    max-height: 500px;
    height: 400px !important;
}

.chart-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-secondary);
    font-family: 'Courier New', monospace;
}

/* Analysis Section */
.analysis-section {
    margin-top: 2rem;
}

.analysis-item {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--color-bg);
    border-radius: 8px;
    border-left: 4px solid var(--color-accent);
}

.analysis-subtitle {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.analysis-meta {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.5rem 1.5rem;
    margin-bottom: 1.25rem;
    font-size: 0.95rem;
}

.analysis-meta dt {
    font-weight: 600;
    color: var(--color-text);
}

.analysis-meta dd {
    color: var(--color-text-light);
}

.analysis-text {
    color: var(--color-text-light);
    line-height: 1.8;
    text-align: justify;
    text-justify: inter-character;
}

/* Footer */
.footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-text {
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .site-title {
        font-size: 1.2rem;
    }

    .section {
        padding: 1.5rem;
    }

    .chart-container {
        padding: 0.75rem;
        margin: 1.5rem -0.5rem;
        min-height: 350px;
    }

    .chart-container canvas {
        height: 350px !important;
    }

    .chart-title {
        font-size: 0.9rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .subsection-title {
        font-size: 1.2rem;
    }

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

    .data-actions {
        flex-direction: column;
    }

    .btn-expand,
    .btn-link {
        width: 100%;
        text-align: center;
    }

    .analysis-meta {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .analysis-meta dt {
        font-weight: 600;
        margin-top: 0.75rem;
    }

    .analysis-meta dt:first-child {
        margin-top: 0;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection */
::selection {
    background: var(--color-accent);
    color: white;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent);
}