*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
    color: #0a0a0f;
    background: #fafbfd;
    line-height: 1.6;
    overflow-x: hidden;
    display: flex;
    padding-top: 72px;
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
}

code {
    font-family: 'Consolas', 'Courier New', monospace;
}

/* Header */
[data-component="header"] {
    display: flex;
    align-items: center;
    padding: 0 2.5rem;
}

[data-component="header"][data-position="fixed"] {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 72px;
    background: rgba(250, 251, 253, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid #e8eaf0;
    z-index: 100;
}

/* Logo */
[data-component="logo"] {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

[data-element="logo-mark"] {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #4a5fc1, #7b68ee);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

[data-element="logo-mark"]::before,
[data-element="logo-mark"]::after {
    content: '';
    position: absolute;
    background: #fafbfd;
    border-radius: 1px;
}

[data-element="logo-mark"]::before {
    width: 16px;
    height: 2px;
    top: 10px;
}

[data-element="logo-mark"]::after {
    width: 12px;
    height: 2px;
    bottom: 10px;
}

[data-text="logo"] {
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: #0a0a0f;
}

[data-badge="version"] {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 2px;
    background: #e8eaf0;
    color: #2a2d3a;
}

/* Sidebar */
[data-component="sidebar"] {
    position: fixed;
    top: 72px;
    left: 0;
    width: 280px;
    height: calc(100vh - 72px);
    background: #fafbfd;
    border-right: 1px solid #e8eaf0;
    overflow-y: auto;
    padding: 2.5rem 0;
}

[data-component="sidebar"]::-webkit-scrollbar {
    width: 6px;
}

[data-component="sidebar"]::-webkit-scrollbar-track {
    background: transparent;
}

[data-component="sidebar"]::-webkit-scrollbar-thumb {
    background: #e8eaf0;
    border-radius: 3px;
}

[data-nav-group] {
    margin-bottom: 1.5rem;
    padding: 0 1.5rem;
}

[data-nav-title] {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #2a2d3a;
    margin-bottom: 0.5rem;
    opacity: 0.6;
}

[data-link="nav"] {
    display: block;
    padding: 0.5rem 1rem;
    color: #2a2d3a;
    font-size: 0.9375rem;
    border-radius: 2px;
    transition: all 0.2s ease;
    position: relative;
}

[data-link="nav"]:hover {
    background: #e8eaf0;
    color: #0a0a0f;
    transform: translateX(2px);
}

[data-link="nav"][data-state="active"] {
    color: #ff6b35;
    background: rgba(255, 107, 53, 0.06);
    font-weight: 600;
}

[data-link="nav"][data-state="active"]::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background: #ff6b35;
    border-radius: 2px;
}

/* Content */
[data-component="content"] {
    margin-left: 280px;
    flex: 1;
    padding: 4rem 2.5rem 4rem 4rem;
    max-width: 1200px;
}

/* Hero */
[data-component="hero"] {
    margin-bottom: 4rem;
    padding-bottom: 4rem;
    border-bottom: 1px solid #e8eaf0;
}

[data-text="hero-title"] {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, #0a0a0f, #2a2d3a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

[data-text="hero-subtitle"] {
    font-size: 1.25rem;
    color: #2a2d3a;
    max-width: 640px;
    line-height: 1.6;
}

/* Section */
[data-section] {
    margin-bottom: 4rem;
    scroll-margin-top: 96px;
}

[data-heading="section"] {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 1rem;
}

[data-heading="section"]::before {
    content: '';
    width: 4px;
    height: 32px;
    background: linear-gradient(180deg, #ff6b35, #ff8c5f);
    border-radius: 2px;
}

[data-text="intro"] {
    font-size: 1.0625rem;
    color: #2a2d3a;
    margin-bottom: 2.5rem;
    max-width: 720px;
}

/* Layout utilities */
[data-layout="flex-row"] {
    display: flex;
}

[data-layout="flex-row"][data-align="center"] {
    align-items: center;
}

[data-layout="flex-row"][data-gap="sm"] {
    gap: 0.5rem;
}

[data-layout="flex-row"][data-gap="md"] {
    gap: 1rem;
}

[data-layout="flex-row"][data-gap="lg"] {
    gap: 1.5rem;
}

[data-layout="flex-row"][data-wrap="wrap"] {
    flex-wrap: wrap;
}

[data-layout="stack-xs"] {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

[data-layout="stack-lg"] {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

[data-layout="grid-colors"] {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

[data-layout="card-content"] {
    padding: 1.5rem;
}

[data-layout="type-meta"] {
    display: flex;
    gap: 1.5rem;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 0.75rem;
    color: #2a2d3a;
    padding-top: 0.5rem;
    border-top: 1px solid #e8eaf0;
}

/* Color cards */
[data-component="color-card"] {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(10, 10, 15, 0.06);
    transition: all 0.3s ease;
}

[data-component="color-card"]:hover {
    box-shadow: 0 12px 32px rgba(10, 10, 15, 0.12);
    transform: translateY(-4px);
}

[data-element="color-swatch"] {
    height: 140px;
    cursor: pointer;
    transition: height 0.3s ease;
}

[data-component="color-card"]:hover [data-element="color-swatch"] {
    height: 160px;
}

[data-element="color-swatch"][data-color="ink"] { background: #0a0a0f; }
[data-element="color-swatch"][data-color="slate"] { background: #2a2d3a; }
[data-element="color-swatch"][data-color="mist"] { background: #e8eaf0; }
[data-element="color-swatch"][data-color="paper"] { background: #fafbfd; border: 1px solid #e8eaf0; }
[data-element="color-swatch"][data-color="accent"] { background: #ff6b35; }
[data-element="color-swatch"][data-color="accent-dim"] { background: #ff8c5f; }
[data-element="color-swatch"][data-color="layer-1"] { background: #4a5fc1; }
[data-element="color-swatch"][data-color="layer-2"] { background: #7b68ee; }
[data-element="color-swatch"][data-color="layer-3"] { background: #c471ed; }
[data-element="color-swatch"][data-color="success"] { background: #06d6a0; }
[data-element="color-swatch"][data-color="error"] { background: #ef476f; }

[data-text="color-name"] {
    font-weight: 700;
    font-size: 1.0625rem;
    margin-bottom: 0.25rem;
}

[data-text="color-value"] {
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 0.875rem;
    color: #2a2d3a;
    margin-bottom: 0.5rem;
}

[data-text="color-usage"] {
    font-size: 0.8125rem;
    color: #2a2d3a;
    line-height: 1.5;
}

/* Typography specimens */
[data-component="type-sample"] {
    margin-bottom: 2.5rem;
    padding: 2.5rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(10, 10, 15, 0.06);
}

[data-element="type-demo"] {
    margin-bottom: 0.5rem;
}

[data-component="type-sample"][data-variant="display-lg"] [data-element="type-demo"] {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.1;
}

[data-component="type-sample"][data-variant="heading-1"] [data-element="type-demo"] {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
}

[data-component="type-sample"][data-variant="heading-2"] [data-element="type-demo"] {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.3;
}

[data-component="type-sample"][data-variant="body-lg"] [data-element="type-demo"] {
    font-size: 1.0625rem;
    line-height: 1.6;
}

[data-component="type-sample"][data-variant="body-base"] [data-element="type-demo"] {
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* Spacing demos */
[data-component="spacing-demo"] {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(10, 10, 15, 0.06);
}

[data-element="spacing-bar"] {
    height: 48px;
    background: linear-gradient(90deg, #4a5fc1, #7b68ee);
    border-radius: 2px;
    transition: all 0.3s ease;
}

[data-component="spacing-demo"]:hover [data-element="spacing-bar"] {
    background: linear-gradient(90deg, #ff6b35, #ff8c5f);
}

[data-element="spacing-bar"][data-size="xs"] { width: 4px; }
[data-element="spacing-bar"][data-size="sm"] { width: 8px; }
[data-element="spacing-bar"][data-size="md"] { width: 16px; }
[data-element="spacing-bar"][data-size="lg"] { width: 24px; }
[data-element="spacing-bar"][data-size="xl"] { width: 40px; }
[data-element="spacing-bar"][data-size="2xl"] { width: 64px; }

[data-text="spacing-name"] {
    font-weight: 700;
    font-family: 'Consolas', 'Courier New', monospace;
    margin-bottom: 0.25rem;
}

[data-text="spacing-value"] {
    font-size: 0.875rem;
    color: #2a2d3a;
}

/* Buttons */
[data-btn] {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border: none;
    border-radius: 4px;
    transition: all 0.2s ease;
}

[data-btn="primary"] {
    background: #ff6b35;
    color: white;
    box-shadow: 0 2px 8px rgba(255, 107, 53, 0.3);
}

[data-btn="primary"]:hover {
    background: #ff5722;
    box-shadow: 0 4px 16px rgba(255, 107, 53, 0.4);
    transform: translateY(-2px);
}

[data-btn="secondary"] {
    background: #0a0a0f;
    color: white;
}

[data-btn="secondary"]:hover {
    background: #2a2d3a;
    transform: translateY(-2px);
}

[data-btn="outline"] {
    background: transparent;
    color: #0a0a0f;
    border: 2px solid #0a0a0f;
}

[data-btn="outline"]:hover {
    background: #0a0a0f;
    color: white;
    transform: translateY(-2px);
}

[data-btn="ghost"] {
    background: transparent;
    color: #2a2d3a;
}

[data-btn="ghost"]:hover {
    background: #e8eaf0;
    color: #0a0a0f;
}

[data-btn]:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

[data-btn]:disabled:hover {
    transform: none;
}

/* Input */
[data-input] {
    width: 100%;
    padding: 0.5rem 1rem;
    font-size: 0.9375rem;
    border: 2px solid #e8eaf0;
    border-radius: 4px;
    background: white;
    color: #0a0a0f;
    transition: all 0.2s ease;
}

[data-input]:focus {
    outline: none;
    border-color: #ff6b35;
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

[data-input]::placeholder {
    color: #2a2d3a;
    opacity: 0.5;
}

[data-input]:disabled {
    background: #e8eaf0;
    cursor: not-allowed;
}

/* Card */
[data-component="card"] {
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(10, 10, 15, 0.08);
    padding: 2.5rem;
    transition: all 0.3s ease;
    max-width: 400px;
}

[data-component="card"]:hover {
    box-shadow: 0 12px 32px rgba(10, 10, 15, 0.12);
    transform: translateY(-4px);
}

[data-text="card-title"] {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

[data-text="card-content"] {
    color: #2a2d3a;
    line-height: 1.6;
}

/* Component showcase */
[data-component="showcase"] {
    margin-bottom: 4rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(10, 10, 15, 0.06);
    overflow: hidden;
}

[data-element="showcase-header"] {
    padding: 1.5rem 2.5rem;
    border-bottom: 1px solid #e8eaf0;
}

[data-text="showcase-title"] {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

[data-text="showcase-desc"] {
    color: #2a2d3a;
    font-size: 0.9375rem;
}

[data-element="showcase-demo"] {
    padding: 4rem 2.5rem;
    background: #fafbfd;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: center;
}

[data-element="showcase-demo"][data-display="block"] {
    display: block;
}

[data-component="form-field"] {
    margin-bottom: 1.5rem;
    max-width: 480px;
}

/* Accessibility */
[data-component="a11y-note"] {
    background: white;
    border-left: 4px solid #06d6a0;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(10, 10, 15, 0.06);
}

[data-text="a11y-title"] {
    font-weight: 700;
    color: #06d6a0;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

[data-text="a11y-body"] {
    color: #2a2d3a;
    line-height: 1.6;
}

[data-text="a11y-body"] code {
    background: #e8eaf0;
    padding: 2px 6px;
    border-radius: 2px;
    font-size: 0.875rem;
    color: #ff6b35;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-32px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

[data-component="hero"] {
    animation: fadeInUp 0.8s ease backwards;
}

[data-text="hero-title"] {
    animation: fadeInUp 0.8s ease 0.1s backwards;
}

[data-text="hero-subtitle"] {
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

[data-section] {
    animation: fadeInUp 0.6s ease backwards;
}

[data-link="nav"] {
    animation: slideInFromLeft 0.4s ease backwards;
}

[data-nav-group]:nth-child(1) [data-link="nav"] { animation-delay: 0.1s; }
[data-nav-group]:nth-child(2) [data-link="nav"] { animation-delay: 0.2s; }
[data-nav-group]:nth-child(3) [data-link="nav"] { animation-delay: 0.3s; }

[data-component="color-card"] {
    animation: fadeInUp 0.5s ease backwards;
}

[data-component="color-card"]:nth-child(1) { animation-delay: 0.05s; }
[data-component="color-card"]:nth-child(2) { animation-delay: 0.1s; }
[data-component="color-card"]:nth-child(3) { animation-delay: 0.15s; }
[data-component="color-card"]:nth-child(4) { animation-delay: 0.2s; }
[data-component="color-card"]:nth-child(5) { animation-delay: 0.25s; }
[data-component="color-card"]:nth-child(6) { animation-delay: 0.3s; }

[data-component="type-sample"],
[data-component="spacing-demo"],
[data-component="showcase"] {
    animation: fadeInUp 0.5s ease backwards;
}

[data-element="logo-mark"]::before,
[data-element="logo-mark"]::after {
    animation: fadeIn 0.6s ease 0.4s backwards;
}

/* Responsive */
@media (max-width: 1024px) {
    [data-component="sidebar"] {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    [data-component="content"] {
        margin-left: 0;
    }

    [data-text="hero-title"] {
        font-size: 2.25rem;
    }
}

@media (max-width: 768px) {
    [data-component="header"] {
        padding: 0 1.5rem;
    }

    [data-component="content"] {
        padding: 2.5rem 1.5rem;
    }

    [data-text="hero-title"] {
        font-size: 2rem;
    }

    [data-text="hero-subtitle"] {
        font-size: 1.0625rem;
    }

    [data-layout="grid-colors"] {
        grid-template-columns: 1fr;
    }
}