/**
 * HFC Academy - Global Design System
 * Modern, Clean, Premium UI/UX
 * No logic changes - UI improvements only
 */

/* ===========================
   CSS VARIABLES (THEME)
   =========================== */
:root {
    /* Primary Colors */
    --primary: #64ffda;
    --primary-dark: #4dd9b5;
    --primary-glow: rgba(100, 255, 218, 0.3);
    
    /* Secondary Colors */
    --secondary: #8a2be2;
    --secondary-glow: rgba(138, 43, 226, 0.3);
    
    /* Accent Colors */
    --accent: #00e5ff;
    --gold: #ffd700;
    --gold-glow: rgba(255, 215, 0, 0.3);
    --danger: #ff4d4d;
    --success: #00b894;
    
    /* Background Colors */
    --bg-primary: #05070a;
    --bg-secondary: #0a0f1a;
    --bg-tertiary: #112240;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-glass: rgba(10, 15, 26, 0.7);
    
    /* Text Colors */
    --text-primary: #e6f1ff;
    --text-secondary: #8892b0;
    --text-muted: #556080;
    
    /* Border Colors */
    --border-light: rgba(100, 255, 218, 0.15);
    --border-medium: rgba(100, 255, 218, 0.3);
    --border-dark: rgba(255, 255, 255, 0.05);
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 30px;
    --radius-full: 9999px;
    
    /* Shadows */
    --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 10px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px var(--primary-glow);
    --shadow-glow-gold: 0 0 30px var(--gold-glow);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Typography */
    --font-display: 'Orbitron', 'Segoe UI', sans-serif;
    --font-body: 'Rajdhani', 'Segoe UI', sans-serif;
    
    /* Z-index layers */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 500;
    --z-modal: 1000;
    --z-tooltip: 1500;
}

/* ===========================
   GLOBAL 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-body);
    background: var(--bg-primary);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(100, 255, 218, 0.05) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(138, 43, 226, 0.05) 0%, transparent 20%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===========================
   TYPOGRAPHY
   =========================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: 2px;
    color: var(--text-primary);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: clamp(1rem, 2.5vw, 1.25rem); }

p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ===========================
   UTILITY CLASSES
   =========================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-narrow {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-gold { color: var(--gold); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }

.bg-primary { background: var(--bg-primary); }
.bg-secondary { background: var(--bg-secondary); }
.bg-card { background: var(--bg-card); }

.flex { display: flex; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }

/* ===========================
   BUTTONS
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 14px 32px;
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    z-index: -1;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.btn:hover::before {
    opacity: 1;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px var(--primary-glow);
}

.btn:active {
    transform: translateY(-1px);
}

.btn-primary {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--secondary);
    color: var(--secondary);
}

.btn-gold {
    background: transparent;
    border: 2px solid var(--gold);
    color: var(--gold);
}

.btn-danger {
    background: transparent;
    border: 2px solid var(--danger);
    color: var(--danger);
}

.btn-success {
    background: transparent;
    border: 2px solid var(--success);
    color: var(--success);
}

.btn-sm {
    padding: 8px 20px;
    font-size: 12px;
}

.btn-lg {
    padding: 18px 40px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

/* ===========================
   CARDS
   =========================== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
}

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

.card-glass {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
}

.card-hover {
    transition: all var(--transition-base);
}

.card-hover:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
}

/* ===========================
   FORMS
   =========================== */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--space-sm);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 14px 18px;
    font-family: var(--font-body);
    font-size: 14px;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(100, 255, 218, 0.05);
    box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* ===========================
   NAVIGATION
   =========================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    padding: var(--space-md) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 900;
    letter-spacing: 3px;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-shadow: 0 0 10px var(--primary-glow);
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
}

.nav-link {
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 1px;
    position: relative;
    padding: var(--space-xs) 0;
    transition: all var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition-base);
}

.nav-link:hover {
    color: var(--primary);
}

.nav-link:hover::after {
    width: 100%;
}

/* ===========================
   HERO SECTION
   =========================== */
.hero {
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--space-2xl) var(--space-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, transparent 20%, var(--bg-primary) 80%);
    z-index: -1;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 900;
    letter-spacing: 4px;
    margin-bottom: var(--space-lg);
    color: var(--primary);
    text-shadow: 0 0 30px var(--primary-glow);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(1rem, 3vw, 1.3rem);
    margin-bottom: var(--space-2xl);
    color: var(--text-secondary);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

/* ===========================
   ANIMATIONS
   =========================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

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

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px var(--primary-glow); }
    50% { box-shadow: 0 0 40px var(--primary-glow), 0 0 60px var(--primary-glow); }
}

.animate-fadeIn { animation: fadeIn var(--transition-base) ease-out; }
.animate-fadeInUp { animation: fadeInUp 0.8s ease-out; }
.animate-float { animation: float 6s ease-in-out infinite; }
.animate-pulse { animation: pulse 2s ease-in-out infinite; }
.animate-glow { animation: glow 3s ease-in-out infinite; }

/* ===========================
   SCROLLBAR
   =========================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

/* ===========================
   SELECTION
   =========================== */
::selection {
    background: var(--primary);
    color: var(--bg-primary);
}

::-moz-selection {
    background: var(--primary);
    color: var(--bg-primary);
}

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 768px) {
    :root {
        --space-lg: 16px;
        --space-xl: 24px;
    }
    
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        display: none;
    }
    
    .hero {
        min-height: 60vh;
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 12px 24px;
        font-size: 13px;
    }
    
    .card {
        padding: var(--space-lg);
    }
}

/* ===========================
   ACCESSIBILITY
   =========================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ===========================
   LOADING STATES
   =========================== */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ===========================
   BADGES
   =========================== */
.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 12px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: var(--radius-full);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
}

.badge-primary {
    background: rgba(100, 255, 218, 0.1);
    border-color: var(--primary);
    color: var(--primary);
}

.badge-gold {
    background: rgba(255, 215, 0, 0.1);
    border-color: var(--gold);
    color: var(--gold);
}

.badge-danger {
    background: rgba(255, 77, 77, 0.1);
    border-color: var(--danger);
    color: var(--danger);
}

.badge-success {
    background: rgba(0, 184, 148, 0.1);
    border-color: var(--success);
    color: var(--success);
}

/* ===========================
   DIVIDER
   =========================== */
.divider {
    height: 1px;
    background: var(--border-dark);
    margin: var(--space-xl) 0;
    border: none;
}

.divider-primary {
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
}

/* ===========================
   TOOLTIP (CSS Only)
   =========================== */
.tooltip {
    position: relative;
    cursor: pointer;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-5px);
    padding: 8px 12px;
    font-size: 12px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-fast);
    z-index: var(--z-tooltip);
    border: 1px solid var(--border-light);
}

.tooltip:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(-8px);
}