/* Dark Modern Design System - Inspired by Modern SaaS */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Playfair+Display:wght@700;800;900&family=Cinzel:wght@600;700;800&display=swap');

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

:root {
    /* Dark Theme Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-elevated: #1f1f1f;

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #d1d1d1;
    --text-tertiary: #a3a3a3;

    /* Accent Colors */
    --accent-green: #10b981;
    --accent-green-hover: #059669;
    --accent-cyan: #06b6d4;
    --accent-purple: #8b5cf6;

    /* Border Colors */
    --border-subtle: #262626;
    --border-default: #404040;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(16, 185, 129, 0.3);

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 800;
}

h2 {
    font-size: clamp(2rem, 4vw, 3.5rem);
    font-weight: 700;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
}

p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1.0625rem;
}

a {
    color: var(--accent-green);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--accent-green-hover);
}

/* Header */
header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-subtle);
    padding: var(--space-lg) 0;
    position: relative;
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.logo-image {
    width: 40px;
    height: 40px;
    filter: brightness(0) invert(1);
}

.logo-text h1 {
    font-family: 'Playfair Display', serif;
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: 0.02em;
}

.logo-text .tagline {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    font-weight: 400;
}

/* Logo link styling */
a.logo-text {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.2s;
}

a.logo-text:hover {
    opacity: 0.8;
}

a.logo-text h1 {
    margin: 0;
}

a.logo-text .tagline {
    margin: 0;
}

/* Navigation */
nav ul {
    display: flex;
    list-style: none;
    gap: var(--space-xl);
    align-items: center;
}

nav a {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9375rem;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    transition: all 0.2s;
}

nav a:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

/* Hero Section */
.hero {
    padding: var(--space-3xl) 0;
    text-align: center;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    transition: all 0.2s;
}

.hero-badge:hover {
    border-color: var(--accent-green);
    background: var(--bg-elevated);
}

.hero h1 {
    margin-bottom: var(--space-lg);
    background: linear-gradient(to right, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto var(--space-2xl);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent-green);
    color: var(--bg-primary);
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    background: var(--accent-green-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
}

.btn-secondary:hover {
    background: var(--bg-elevated);
    border-color: var(--border-default);
}

.btn-group {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Cards */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    transition: all 0.3s;
}

.card:hover {
    border-color: var(--border-default);
    background: var(--bg-tertiary);
    transform: translateY(-4px);
}

.card h3 {
    margin-bottom: var(--space-md);
    font-size: 1.5rem;
}

.card p {
    color: var(--text-secondary);
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: var(--space-xl);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Section */
section {
    padding: 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-header h2 {
    margin-bottom: var(--space-md);
}

.section-header p {
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Footer */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-subtle);
    padding: var(--space-3xl) 0 var(--space-xl);
    margin-top: var(--space-3xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer-section h4 {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: var(--space-md);
    font-weight: 600;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--space-sm);
}

.footer-section a {
    color: var(--text-tertiary);
    font-size: 0.9375rem;
    transition: color 0.2s;
}

.footer-section a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-subtle);
    padding-top: var(--space-lg);
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-md);
    }

    header .container {
        flex-direction: column;
        gap: var(--space-md);
    }

    nav ul {
        flex-direction: column;
        gap: var(--space-sm);
        width: 100%;
    }

    nav a {
        width: 100%;
        text-align: center;
    }

    .btn-group {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .category-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-gradient {
    background: linear-gradient(to right, var(--accent-green), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Homepage Specific Styles */
.category-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
}

.category-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-green), var(--accent-cyan));
    transform: scaleX(0);
    transition: transform 0.3s;
}

.category-card:hover::before {
    transform: scaleX(1);
}

.category-card:hover {
    border-color: var(--accent-green);
    background: var(--bg-tertiary);
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(16, 185, 129, 0.15);
}

.category-card .icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    display: inline-block;
    transition: transform 0.3s;
}

.category-card:hover .icon {
    transform: scale(1.1) rotate(5deg);
}

.category-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.category-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.category-card a {
    color: var(--accent-green);
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap 0.3s;
}

.category-card a:hover {
    gap: 0.75rem;
}

/* Sheet Music List */
.sheet-music-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-2xl);
}

.sheet-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
}

.sheet-item:hover {
    border-color: var(--accent-green);
    background: var(--bg-tertiary);
    transform: translateX(8px);
}

.sheet-thumb {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.sheet-info h4 {
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.sheet-info h4 a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s;
}

.sheet-info h4 a:hover {
    color: var(--accent-green);
}

.sheet-info p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* Theory Grid */
.theory-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
}

.theory-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    transition: all 0.3s;
    text-align: center;
}

.theory-card:hover {
    border-color: var(--accent-cyan);
    background: var(--bg-tertiary);
    transform: translateY(-6px);
    box-shadow: 0 15px 30px rgba(6, 182, 212, 0.15);
}

.theory-card .card-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

.theory-card h3 {
    font-size: 1.375rem;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.theory-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.theory-card a {
    color: var(--accent-cyan);
    font-weight: 600;
    text-decoration: none;
    transition: color 0.2s;
}

.theory-card a:hover {
    color: var(--accent-green);
}

/* Section Spacing */
/* Section Spacing */
.featured-content,
.recent-additions,
.music-theory-preview,
.tools-preview {
    padding: var(--space-3xl) 0;
}

.featured-content h2,
.recent-additions h2,
.music-theory-preview h2,
.tools-preview h2 {
    text-align: center;
    margin-bottom: var(--space-md);
    font-size: 2.5rem;
}

/* Responsive Fixes for Homepage - Added via Automation to fix Cascade issues */
@media (max-width: 768px) {
    .category-grid {
        grid-template-columns: 1fr !important;
        gap: var(--space-lg);
    }

    .sheet-music-list {
        grid-template-columns: 1fr !important;
    }

    .theory-grid {
        grid-template-columns: 1fr !important;
    }
}

/* Responsive Fixes for Homepage - Added via Automation to fix Cascade issues - RETRY */
@media (max-width: 768px) {
    .category-grid {
        grid-template-columns: 1fr !important;
        gap: var(--space-lg);
    }

    .sheet-music-list {
        grid-template-columns: 1fr !important;
    }

    .theory-grid {
        grid-template-columns: 1fr !important;
    }
}