/**
 * Main Styles - Volleyrank Dark Theme
 * 
 * Volleyrank-inspired design system with:
 * - Volleyrank Dark color palette
 * - Clean, professional interface
 * - Subtle animations and interactions
 * - Optimized for developer experience
 * 
 * @version 5.1.0
 * @theme Volleyrank Dark
 */

/* =============================================================================
   Volleyrank Design Tokens
   ============================================================================= */

:root {
    /* ==========================================================================
       Volleyrank Dark Color System
       ========================================================================== */
    
    /* Primary Backgrounds */
    --color-bg-primary: #0d1117;
    --color-bg-secondary: #161b22;
    --color-bg-tertiary: #21262d;
    --color-bg-elevated: #30363d;
    
    /* Surface Colors */
    --color-surface-base: #161b22;
    --color-surface-raised: #21262d;
    --color-surface-overlay: #30363d;
    --color-surface-interactive: #388bfd1a;
    
    /* Borders */
    --color-border-subtle: #21262d;
    --color-border-default: #30363d;
    --color-border-strong: #484f58;
    --color-border-active: #58a6ff;
    
    /* Text Colors */
    --color-text-primary: #e6edf3;
    --color-text-secondary: #7d8590;
    --color-text-tertiary: #6e7681;
    --color-text-disabled: #484f58;
    --color-text-inverse: #0d1117;
    --color-text-link: #58a6ff;
    
    /* Brand Colors - Volleyrank Blue */
    --color-brand-primary: #2f81f7;
    --color-brand-primary-hover: #58a6ff;
    --color-brand-primary-active: #1f6feb;
    --color-brand-secondary: #a371f7;
    --color-brand-accent: #ff7b72;
    
    /* Semantic Colors */
    --color-success: #3fb950;
    --color-success-hover: #2ea043;
    --color-success-light: rgba(46, 160, 67, 0.1);
    
    --color-warning: #d29922;
    --color-warning-hover: #bb8009;
    --color-warning-light: rgba(187, 128, 9, 0.1);
    
    --color-error: #f85149;
    --color-error-hover: #da3633;
    --color-error-light: rgba(248, 81, 73, 0.1);
    
    --color-info: #2f81f7;
    --color-info-hover: #58a6ff;
    --color-info-light: rgba(47, 129, 247, 0.1);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #1f6feb 0%, #2ea043 100%);
    --gradient-brand: linear-gradient(135deg, #2f81f7 0%, #1f6feb 100%);
    --gradient-success: linear-gradient(135deg, #2ea043 0%, #3fb950 100%);
    --gradient-warm: linear-gradient(135deg, #d29922 0%, #da3633 100%);
    --gradient-cool: linear-gradient(135deg, #2f81f7 0%, #a371f7 100%);
    --gradient-dark: linear-gradient(135deg, #161b22 0%, #0d1117 100%);
    
    /* ==========================================================================
       Typography - Volleyrank Scale
       ========================================================================== */
    
    /* Font Families */
    --font-family-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    --font-family-mono: 'SFMono-Regular', 'Consolas', 'Liberation Mono', 'Menlo', monospace;
    
    /* Font Sizes */
    --font-size-2xs: 0.75rem;
    --font-size-xs: 0.8rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Font Weights */
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Line Heights */
    --line-height-none: 1;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Letter Spacing */
    --letter-spacing-tight: -0.01em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.01em;
    
    /* ==========================================================================
       Spacing - Volleyrank Scale
       ========================================================================== */
    
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    --spacing-24: 6rem;
    
    /* ==========================================================================
       Border Radius
       ========================================================================== */
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 50%;
    
    /* ==========================================================================
       Shadows
       ========================================================================== */
    
    --shadow-sm: 0 1px 0 rgba(1, 4, 9, 0.1);
    --shadow-md: 0 3px 6px rgba(1, 4, 9, 0.15);
    --shadow-lg: 0 8px 24px rgba(1, 4, 9, 0.2);
    --shadow-xl: 0 16px 48px rgba(1, 4, 9, 0.3);
    
    /* ==========================================================================
       Animation & Timing
       ========================================================================== */
    
    --duration-fast: 0.1s;
    --duration-default: 0.2s;
    --duration-slow: 0.3s;
    
    --ease-out: cubic-bezier(0.2, 0.8, 0.4, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    
    --transition-default: all var(--duration-default) var(--ease-out);
    
    /* ==========================================================================
       Layout
       ========================================================================== */
    
    --header-height: 4rem;
    --nav-height: 3rem;
    --container-max-width: 1280px;
}

/* =============================================================================
   Reset & Base Styles
   ============================================================================= */

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

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Volleyrank-like background pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(47, 129, 247, 0.03) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(46, 160, 67, 0.03) 0%, transparent 25%);
    pointer-events: none;
    z-index: -1;
}

/* =============================================================================
   Typography
   ============================================================================= */

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-4);
}

h1 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
}

h2 {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-6);
}

h3 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

h4 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
}

p {
    margin-bottom: var(--spacing-4);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

a {
    color: var(--color-text-link);
    text-decoration: none;
    transition: var(--transition-default);
}

a:hover {
    color: var(--color-brand-primary-hover);
    text-decoration: underline;
}

/* =============================================================================
   Layout Components
   ============================================================================= */

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border-default);
    height: var(--header-height);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
}

.header-content {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-6);
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.app-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin: 0;
}

.app-title-link {
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: center;
    transition: var(--transition-default);
    border-radius: var(--radius-md);
    padding: var(--spacing-2) var(--spacing-3);
    margin: calc(var(--spacing-2) * -1) calc(var(--spacing-3) * -1);
}

.app-title-link:hover {
    text-decoration: none;
    opacity: 0.8;
}

.app-title-link:hover .app-title {
    text-decoration: none;
}

.app-title-link:active {
    transform: scale(0.98);
}

.app-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    font-weight: var(--font-weight-regular);
}

/* Navigation */
.app-nav {
    background-color: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border-default);
    height: var(--nav-height);
    position: sticky;
    top: var(--header-height);
    z-index: 90;
    margin: 0;
}

.app-nav .nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-6);
    height: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.nav-link {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: var(--transition-default);
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--color-text-primary);
    background-color: var(--color-surface-overlay);
    border-color: var(--color-border-default);
    text-decoration: none;
}

.nav-link.active {
    color: var(--color-text-primary);
    background-color: var(--color-surface-raised);
    border-color: var(--color-border-strong);
    font-weight: var(--font-weight-semibold);
}

/* Main Content */
.app-main {
    flex: 1;
    max-width: var(--container-max-width);
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-8) var(--spacing-6);
}

.page {
    animation: fadeInUp var(--duration-slow) var(--ease-out);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page-header {
    margin-bottom: var(--spacing-8);
    padding-bottom: var(--spacing-4);
}

.page-header h2 {
    margin-bottom: 0;
}

/* Footer */
.app-footer {
    background-color: transparent;
    border-top: 1px solid var(--color-border-default);
    padding: var(--spacing-8) var(--spacing-6);
    margin-top: auto;
}

.app-footer .footer-content {
    max-width: var(--container-max-width);
    margin: 0 auto;
    text-align: center;
}

.app-footer a {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.app-footer a:hover {
    color: var(--color-text-link);
    text-decoration: none;
}

.github-icon {
    width: 16px;
    height: 16px;
}

/* =============================================================================
   State Components
   ============================================================================= */

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-16);
    color: var(--color-text-tertiary);
}

.loading-spinner {
    width: 2rem;
    height: 2rem;
    border: 2px solid var(--color-border-default);
    border-top-color: var(--color-brand-primary);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-4);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.empty-state {
    text-align: center;
    padding: var(--spacing-12) var(--spacing-8);
    color: var(--color-text-tertiary);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-4);
    opacity: 0.5;
}

.error-state {
    background-color: var(--color-error-light);
    border: 1px solid var(--color-error);
    border-radius: var(--radius-md);
    padding: var(--spacing-4);
    margin: var(--spacing-4) 0;
}

.error-icon {
    color: var(--color-error);
    margin-right: var(--spacing-2);
}

/* =============================================================================
   Scrollbar
   ============================================================================= */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-border-default);
    border-radius: var(--radius-full);
}

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

/* =============================================================================
   Selection
   ============================================================================= */

::selection {
    background-color: rgba(47, 129, 247, 0.2);
    color: var(--color-text-primary);
}

/* =============================================================================
   Focus States
   ============================================================================= */

:focus-visible {
    outline: 2px solid var(--color-brand-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* =============================================================================
   Responsive Design
   ============================================================================= */

@media (max-width: 768px) {
    :root {
        --header-height: 3.5rem;
        --nav-height: 3rem;
    }
    
    .header-content,
    .app-nav .nav-container,
    .app-main,
    .app-footer .footer-content {
        padding: 0 var(--spacing-4);
    }
    
    .app-main {
        padding: var(--spacing-6) var(--spacing-4);
    }
    
    .app-title {
        font-size: var(--font-size-lg);
        padding: 0;
    }
    
    .app-subtitle {
        display: none;
    }
    
    .nav-link {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: var(--font-size-sm);
    }

    h2 {
        font-size: var(--font-size-xl);
    }
}

@media (max-width: 544px) {
    .app-nav .nav-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .nav-link {
        white-space: nowrap;
    }

    .app-header {
        height: var(--header-height);
    }
}

/* =============================================================================
   Print Styles
   ============================================================================= */

@media print {
    .app-header,
    .app-nav,
    .app-footer {
        display: none;
    }
    
    .app-main {
        padding: 0;
        max-width: none;
    }
}

/* =============================================================================
   Reduced Motion
   ============================================================================= */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* =============================================================================
   High Contrast
   ============================================================================= */

@media (prefers-contrast: high) {
    :root {
        --color-border-default: #57606a;
        --color-text-primary: #ffffff;
        --color-text-secondary: #d0d7de;
    }
}