/* Common Design System for Linear Algebra Visualizer Suite */

:root {
    /* Colors */
    --bg-primary: #0B0F19;
    --bg-secondary: rgba(15, 23, 42, 0.85);
    --bg-glass: rgba(15, 23, 42, 0.6);

    --cyan-primary: #06B6D4;
    --cyan-secondary: #0891B2;
    --magenta-primary: #EC4899;
    --purple-primary: #A78BFA;
    --red-primary: #F87171;

    --text-primary: #F9FAFB;
    --text-secondary: #E5E7EB;
    --text-tertiary: #D1D5DB;
    --text-muted: #9CA3AF;

    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.2);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.3), 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-secondary);
    overflow-x: hidden;
}

/* Glassmorphism Panel */
.glass-panel {
    background: var(--bg-secondary);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

/* Button Base Styles */
.btn {
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: var(--font-sans);
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    box-shadow: var(--shadow-sm);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: linear-gradient(135deg, var(--cyan-primary) 0%, var(--cyan-secondary) 100%);
    color: var(--bg-primary);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-color);
    color: var(--text-tertiary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--border-hover);
}

/* Navigation Header */
.nav-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--bg-secondary);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-lg);
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.nav-header .nav-home {
    font-size: 18px;
    font-weight: 600;
    color: var(--cyan-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}

.nav-header .nav-home:hover {
    color: var(--cyan-secondary);
    transform: translateX(-2px);
}

.nav-breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 14px;
    color: var(--text-muted);
    margin-left: var(--spacing-md);
}

.nav-breadcrumb .separator {
    color: var(--border-color);
}

.nav-breadcrumb .current {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Section Header */
.section-header {
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

/* Utility Classes */
.text-cyan { color: var(--cyan-primary); }
.text-magenta { color: var(--magenta-primary); }
.text-purple { color: var(--purple-primary); }
.text-muted { color: var(--text-muted); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }