/**
 * DESIGN SYSTEM v3.0
 * Modern, consistent, maintainable
 * December 2025
 */

:root {
    /* ============================================ */
    /* SPACING SYSTEM (8px baseline grid)          */
    /* ============================================ */
    --space-1: 0.25rem;  /* 4px */
    --space-2: 0.5rem;   /* 8px */
    --space-3: 0.75rem;  /* 12px */
    --space-4: 1rem;     /* 16px */
    --space-5: 1.25rem;  /* 20px */
    --space-6: 1.5rem;   /* 24px */
    --space-8: 2rem;     /* 32px */
    --space-10: 2.5rem;  /* 40px */
    --space-12: 3rem;    /* 48px */
    --space-16: 4rem;    /* 64px */
    
    /* ============================================ */
    /* BORDER RADIUS (consistent rounding)         */
    /* ============================================ */
    --radius-sm: 0.375rem;   /* 6px - badges, small pills */
    --radius-md: 0.5rem;     /* 8px - buttons, inputs */
    --radius-lg: 0.75rem;    /* 12px - cards */
    --radius-xl: 1rem;       /* 16px - hero sections */
    --radius-full: 9999px;   /* full - avatars, pills */
    
    /* ============================================ */
    /* COLORS - Dark Theme Premium                 */
    /* ============================================ */
    --color-bg-primary: #0f1117;        /* Main background */
    --color-bg-surface: #1a1d29;        /* Cards, elevated */
    --color-bg-surface-hover: #20232f;  /* Hover state */
    --color-bg-elevated: #24273a;       /* Modals, dropdowns */
    
    --color-border-subtle: rgba(99, 102, 241, 0.1);
    --color-border-default: rgba(99, 102, 241, 0.2);
    --color-border-strong: rgba(99, 102, 241, 0.3);
    
    --color-text-primary: #ffffff;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;
    
    /* Primary Colors */
    --color-primary-50: #eef2ff;
    --color-primary-400: #818cf8;
    --color-primary-500: #6366f1;
    --color-primary-600: #4f46e5;
    --color-primary-700: #4338ca;
    
    /* Success / Online */
    --color-success-400: #4ade80;
    --color-success-500: #22c55e;
    --color-success-bg: rgba(34, 197, 94, 0.1);
    
    /* Danger / Offline */
    --color-danger-400: #f87171;
    --color-danger-500: #ef4444;
    --color-danger-bg: rgba(239, 68, 68, 0.1);
    
    /* ============================================ */
    /* SHADOWS - Subtle depth                      */
    /* ============================================ */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
    
    /* ============================================ */
    /* TRANSITIONS                                  */
    /* ============================================ */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* ============================================ */
    /* TYPOGRAPHY                                   */
    /* ============================================ */
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
}

/* ============================================ */
/* BASE RESETS                                  */
/* ============================================ */
* {
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: var(--line-height-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================ */
/* COMPONENT LIBRARY                            */
/* ============================================ */

/* Card Base */
.card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    transition: all var(--transition-base);
}

.card:hover {
    background: var(--color-bg-surface-hover);
    border-color: var(--color-border-strong);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Button Base */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    min-height: 44px; /* Touch target */
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-700));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-success {
    background: linear-gradient(135deg, var(--color-success-500), #059669);
    color: white;
}

.btn-ghost {
    background: transparent;
    border: 1px solid var(--color-border-default);
    color: var(--color-text-secondary);
}

.btn-ghost:hover {
    background: var(--color-bg-surface);
    border-color: var(--color-border-strong);
    color: var(--color-text-primary);
}

/* Icon Button - Clear hit area */
.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    min-width: 40px; /* Touch target */
    min-height: 40px;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    cursor: pointer;
    background: transparent;
    border: none;
}

.icon-btn:hover {
    background: var(--color-bg-surface);
    color: var(--color-primary-400);
    transform: scale(1.05);
}

.icon-btn:active {
    transform: scale(0.95);
}

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    white-space: nowrap;
}

.badge-primary {
    background: rgba(99, 102, 241, 0.15);
    color: var(--color-primary-400);
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.badge-success {
    background: var(--color-success-bg);
    color: var(--color-success-400);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.badge-danger {
    background: var(--color-danger-bg);
    color: var(--color-danger-400);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* Status Dot */
.status-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.status-dot-online {
    background: var(--color-success-500);
    animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.status-dot-offline {
    background: var(--color-danger-500);
}

/* ============================================ */
/* SERVER CARD - Redesigned                     */
/* ============================================ */
.server-card {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--space-4);
    padding: var(--space-5);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    margin-bottom: var(--space-6);
}

.server-card:hover {
    background: var(--color-bg-surface-hover);
    border-color: var(--color-border-strong);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.server-card-rank {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-700));
    border-radius: var(--radius-md);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-extrabold);
    color: white;
    box-shadow: var(--shadow-md);
    flex-shrink: 0;
}

.server-card-banner {
    width: 240px;
    height: 36px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    flex-shrink: 0;
}

.server-card-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.server-card-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    min-width: 0; /* Allow text truncation */
}

.server-card-name {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.server-card-name:hover {
    color: var(--color-primary-400);
}

.server-card-stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    align-items: center;
}

.server-card-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    align-items: flex-end;
    justify-content: center;
}

/* IP Copy Button - Better visibility */
.ip-copy-group {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.ip-copy-group:hover {
    background: rgba(99, 102, 241, 0.15);
    border-color: rgba(99, 102, 241, 0.3);
}

.ip-copy-group code {
    font-family: 'SF Mono', 'Courier New', monospace;
    font-size: var(--font-size-xs);
    color: var(--color-primary-400);
    font-weight: var(--font-weight-semibold);
}

.ip-copy-group .copy-icon {
    color: var(--color-text-muted);
    cursor: pointer;
    padding: var(--space-1);
    transition: all var(--transition-fast);
}

.ip-copy-group .copy-icon:hover {
    color: var(--color-primary-400);
    transform: scale(1.1);
}

/* ============================================ */
/* RESPONSIVE BREAKPOINTS                       */
/* ============================================ */
@media (max-width: 768px) {
    .server-card {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }
    
    .server-card-rank {
        grid-row: 1;
        width: 40px;
        height: 40px;
        font-size: var(--font-size-lg);
    }
    
    .server-card-banner {
        grid-row: 2;
        width: 100%;
        height: 48px;
    }
    
    .server-card-actions {
        grid-row: 4;
        align-items: stretch;
    }
    
    .server-card-actions .btn {
        width: 100%;
    }
}

/* ============================================ */
/* UTILITY CLASSES                              */
/* ============================================ */
.container-custom {
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-4);
    padding-right: var(--space-4);
}

@media (min-width: 1024px) {
    .container-custom {
        padding-left: var(--space-8);
        padding-right: var(--space-8);
    }
}

.section-spacing {
    padding-top: var(--space-12);
    padding-bottom: var(--space-12);
}

@media (min-width: 768px) {
    .section-spacing {
        padding-top: var(--space-16);
        padding-bottom: var(--space-16);
    }
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary-400), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Focus visible for accessibility */
*:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

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

/* Selection color */
::selection {
    background: var(--color-primary-600);
    color: white;
}