/* ============================================= */
/* MAIN.CSS — Design Tokens & Global Styles      */
/* ============================================= */

/* ---------- Design Tokens ---------- */
:root {
    /* Background palette */
    --bg-deepest: #050816;
    --bg-deep: #0a0e27;
    --bg-primary: #080c20;
    --bg-medium: #111640;
    --bg-light: #1a2055;

    /* Neon accents */
    --neon-cyan: #00f0ff;
    --neon-magenta: #ff00aa;
    --neon-gold: #ffd700;
    --neon-green: #00ff88;
    --neon-red: #ff2255;
    --neon-purple: #aa44ff;
    --neon-orange: #ff8800;

    /* Combo Tiers */
    --combo-fire: #ff6600;
    --combo-lightning: #aa00ff;
    --combo-divine: #ffd700;
    --combo-ultra: #ff0088;

    /* Text */
    --text-primary: #e8eaff;
    --text-secondary: #8890b5;
    --text-muted: #4a5080;
    --text-bright: #ffffff;

    /* Glass */
    --glass-bg: rgba(15, 20, 50, 0.7);
    --glass-border: rgba(100, 120, 255, 0.15);
    --glass-highlight: rgba(255, 255, 255, 0.05);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow-cyan: 0 0 20px rgba(0, 240, 255, 0.3), 0 0 60px rgba(0, 240, 255, 0.1);
    --shadow-glow-magenta: 0 0 20px rgba(255, 0, 170, 0.3), 0 0 60px rgba(255, 0, 170, 0.1);
    --shadow-glow-gold: 0 0 20px rgba(255, 215, 0, 0.3), 0 0 60px rgba(255, 215, 0, 0.1);

    /* Typography */
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Sizes */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: var(--font-body);
    background: var(--bg-deepest);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(0, 240, 255, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(255, 0, 170, 0.03) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(170, 68, 255, 0.03) 0%, transparent 50%),
        var(--bg-deepest);
}

/* ---------- Screen System ---------- */
.screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease;
    z-index: 1;
}

.screen.active {
    opacity: 1;
    visibility: visible;
    z-index: 10;
}

.screen.exiting {
    opacity: 0;
    z-index: 5;
}

/* ---------- Scrollable screens ---------- */
#screen-chapters,
#screen-lessons {
    justify-content: flex-start;
    overflow-y: auto;
    padding: 30px;
}

#screen-freeplay {
    justify-content: flex-start;
    padding: 30px;
}

/* ---------- Screen Header ---------- */
.screen-header {
    width: 100%;
    max-width: 900px;
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
    flex-shrink: 0;
}

.screen-title {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-bright);
    letter-spacing: 1px;
}

/* ---------- Glass Card ---------- */
.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 24px;
    box-shadow: var(--shadow-md);
}

/* ---------- Buttons ---------- */
.btn {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 1px;
    padding: 14px 32px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
    user-select: none;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--neon-cyan), #0088cc);
    color: var(--bg-deepest);
    box-shadow: 0 4px 15px rgba(0, 240, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(0, 240, 255, 0.5);
}

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

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(20, 30, 70, 0.8);
    border-color: var(--neon-cyan);
    color: var(--neon-cyan);
    transform: translateY(-2px);
}

.btn-glow {
    animation: glowPulse 2s ease-in-out infinite;
}

.btn-large {
    font-size: 1.1rem;
    padding: 18px 44px;
}

.btn-sm {
    font-size: 0.75rem;
    padding: 8px 16px;
    letter-spacing: 0.5px;
}

.btn-sm.active {
    background: linear-gradient(135deg, var(--neon-cyan), #0088cc);
    color: var(--bg-deepest);
}

.btn-icon {
    font-size: 1.2em;
}

.btn-back {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1px;
    padding: 8px 16px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--glass-bg);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.btn-back:hover {
    color: var(--neon-cyan);
    border-color: var(--neon-cyan);
}

.btn-group {
    display: flex;
    gap: 8px;
}

/* ---------- HP / XP Bars ---------- */
.hp-bar-outer {
    width: 100%;
    height: 14px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 7px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
}

.hp-bar-inner {
    height: 100%;
    border-radius: 7px;
    transition: width 0.5s ease;
    position: relative;
}

.hp-bar-inner::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(to bottom, rgba(255,255,255,0.3), transparent);
    border-radius: 7px 7px 0 0;
}

.boss-hp {
    background: linear-gradient(90deg, var(--neon-red), #ff4466);
    box-shadow: 0 0 10px rgba(255, 34, 85, 0.5);
}

.player-hp {
    background: linear-gradient(90deg, var(--neon-green), #44ffaa);
    box-shadow: 0 0 10px rgba(0, 255, 136, 0.5);
}

.xp-bar-container {
    width: 100%;
    height: 8px;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
    margin-top: 4px;
}

.xp-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--neon-purple), var(--neon-magenta));
    border-radius: 4px;
    transition: width 0.8s ease;
}

.xp-text {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.55rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
}

/* ---------- Star Ratings ---------- */
.star {
    font-size: 2.5rem;
    color: var(--text-muted);
    transition: all 0.3s ease;
    text-shadow: none;
}

.star.earned {
    color: var(--neon-gold);
    text-shadow: 0 0 15px rgba(255, 215, 0, 0.6), 0 0 30px rgba(255, 215, 0, 0.3);
    animation: starPop 0.5s ease-out;
}

/* ---------- Boot Screen ---------- */
.boot-content {
    text-align: center;
}

.boot-logo {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 900;
    letter-spacing: 4px;
    margin-bottom: 16px;
}

.boot-logo-type {
    color: var(--neon-cyan);
    text-shadow: 0 0 20px rgba(0, 240, 255, 0.5), 0 0 40px rgba(0, 240, 255, 0.3);
}

.boot-logo-master {
    color: var(--neon-magenta);
    text-shadow: 0 0 20px rgba(255, 0, 170, 0.5), 0 0 40px rgba(255, 0, 170, 0.3);
}

.boot-subtitle {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
    letter-spacing: 3px;
    margin-bottom: 40px;
    animation: blink 1s step-end infinite;
}

.boot-loader {
    width: 300px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto;
}

.boot-loader-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-magenta));
    border-radius: 2px;
    animation: bootLoad 2s ease-in-out forwards;
}

/* ---------- Ambient Particles Container ---------- */
.ambient-particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(100, 120, 255, 0.3);
}

/* ---------- Selection ---------- */
::selection {
    background: rgba(0, 240, 255, 0.3);
    color: var(--text-bright);
}

/* ---------- Utility Classes ---------- */
.hidden {
    display: none !important;
}

.text-cyan { color: var(--neon-cyan); }
.text-magenta { color: var(--neon-magenta); }
.text-gold { color: var(--neon-gold); }
.text-green { color: var(--neon-green); }
.text-red { color: var(--neon-red); }