/* ===== 5G MONITORING DASHBOARD — DESIGN SYSTEM ===== */

/* --- CSS Variables (Design Tokens) --- */
:root {
    /* Color Palette */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: #1a2035;
    --bg-card-hover: #1e2642;
    --bg-sidebar: #0d1117;
    --bg-input: #151d2e;

    --text-primary: #e8ecf4;
    --text-secondary: #8892a8;
    --text-muted: #5a6478;

    --accent-blue: #00d4ff;
    --accent-purple: #7b2ff7;
    --accent-green: #00e676;
    --accent-orange: #ff9100;
    --accent-red: #ff4757;
    --accent-yellow: #ffd600;
    --accent-pink: #ff6b9d;

    --gradient-primary: linear-gradient(135deg, #00d4ff, #7b2ff7);
    --gradient-success: linear-gradient(135deg, #00e676, #00bfa5);
    --gradient-danger: linear-gradient(135deg, #ff4757, #ff6b81);
    --gradient-warning: linear-gradient(135deg, #ff9100, #ffd600);
    --gradient-card: linear-gradient(145deg, #1a2035, #151b2d);

    --border-color: #1e2a3a;
    --border-color-light: #2a3650;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow-blue: 0 0 20px rgba(0, 212, 255, 0.15);
    --shadow-glow-green: 0 0 20px rgba(0, 230, 118, 0.15);
    --shadow-glow-red: 0 0 20px rgba(255, 71, 87, 0.15);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-xs: 0.7rem;
    --font-sm: 0.8rem;
    --font-base: 0.9rem;
    --font-md: 1rem;
    --font-lg: 1.25rem;
    --font-xl: 1.5rem;
    --font-2xl: 2rem;
    --font-3xl: 2.5rem;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 50%;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;

    /* Layout */
    --sidebar-width: 240px;
    --header-height: 64px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    color: inherit;
}

input {
    font-family: inherit;
    border: none;
    outline: none;
    background: none;
    color: inherit;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border-color-light);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Utility */
.text-green { color: var(--accent-green); }
.text-red { color: var(--accent-red); }
.text-orange { color: var(--accent-orange); }
.text-blue { color: var(--accent-blue); }
.text-yellow { color: var(--accent-yellow); }
.text-muted { color: var(--text-secondary); }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

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

@keyframes glow {
    0%, 100% { box-shadow: 0 0 5px rgba(0, 212, 255, 0.2); }
    50% { box-shadow: 0 0 20px rgba(0, 212, 255, 0.4); }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease forwards;
}