/* ============================================
   GUTO'S RACING — DESIGN SYSTEM
   ============================================ */

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

:root {
    /* Primary Colors */
    --guto-blue-dark: #0a1628;
    --guto-blue: #1a2a4a;
    --guto-blue-light: #2a4a7a;
    --guto-blue-accent: #2196F3;
    --guto-blue-bright: #42a5f5;
    
    /* Secondary Colors */
    --gold: #FFD700;
    --gold-dark: #FFA000;
    --gold-light: #FFE44D;
    --red: #E53935;
    --red-dark: #C62828;
    --red-light: #EF5350;
    --orange: #FF6D00;
    --orange-light: #FF9100;
    --green: #00C853;
    --green-dark: #00A843;
    
    /* Neutrals */
    --white: #FFFFFF;
    --gray-100: #F5F5F5;
    --gray-200: #E0E0E0;
    --gray-300: #BDBDBD;
    --gray-400: #9E9E9E;
    --gray-500: #757575;
    --gray-600: #616161;
    --gray-700: #424242;
    --gray-800: #303030;
    --gray-900: #1a1a2e;
    --black: #000000;
    
    /* Character Colors */
    --car-guto: #1a2a5a;
    --car-max: #1e3d8f;
    --car-norris: #FF8000;
    --car-leclerc: #DC0000;
    --car-hamilton: #1a1a1a;
    --car-kimi: #1a3a2a;
    --car-ayrton: #f5f5f0;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #1565C0, #42a5f5);
    --gradient-gold: linear-gradient(135deg, #FFA000, #FFD700);
    --gradient-dark: linear-gradient(180deg, #0a1628 0%, #1a2a4a 50%, #0a1628 100%);
    --gradient-race: linear-gradient(135deg, #E53935, #FF6D00);
    --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0.05));
    
    /* 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 8px 32px rgba(0,0,0,0.5);
    --shadow-glow-blue: 0 0 20px rgba(33,150,243,0.4);
    --shadow-glow-gold: 0 0 20px rgba(255,215,0,0.4);
    --shadow-glow-red: 0 0 20px rgba(229,57,53,0.4);
    
    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50%;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Z-indices */
    --z-bg: 0;
    --z-content: 10;
    --z-hud: 50;
    --z-controls: 60;
    --z-overlay: 80;
    --z-modal: 90;
    --z-loading: 100;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: var(--font-body);
    background: var(--guto-blue-dark);
    color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
}

#app {
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
}

/* ============================================
   SCREEN SYSTEM
   ============================================ */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
}

.screen.active {
    display: flex;
}

.screen-enter {
    animation: screenFadeIn 0.4s ease forwards;
}

.screen-exit {
    animation: screenFadeOut 0.3s ease forwards;
}

@keyframes screenFadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* ============================================
   LOADING SCREEN
   ============================================ */
#loading-screen {
    background: var(--guto-blue-dark);
    z-index: var(--z-loading);
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-content {
    text-align: center;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255,255,255,0.1);
    border-top-color: var(--guto-blue-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--space-md);
}

.loading-text {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--gray-300);
    letter-spacing: 2px;
}

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

/* ============================================
   BUTTONS
   ============================================ */
button {
    font-family: var(--font-heading);
    cursor: pointer;
    border: none;
    outline: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-glow-blue);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn-primary:active {
    transform: scale(0.95);
    box-shadow: 0 0 10px rgba(33,150,243,0.6);
}

.btn-primary:active::before {
    left: 100%;
}

.btn-primary.btn-race {
    background: var(--gradient-race);
    box-shadow: var(--shadow-glow-red);
}

.btn-primary.btn-race:active {
    box-shadow: 0 0 10px rgba(229,57,53,0.6);
}

.btn-secondary {
    background: var(--gradient-glass);
    color: var(--white);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.btn-secondary:active {
    transform: scale(0.95);
    background: rgba(255,255,255,0.15);
}

.btn-ghost {
    background: transparent;
    color: var(--gray-300);
    font-weight: 500;
    letter-spacing: 1px;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.btn-ghost:active {
    color: var(--white);
    background: rgba(255,255,255,0.05);
}

.btn-danger {
    background: linear-gradient(135deg, var(--red-dark), var(--red));
    color: var(--white);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

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

.btn-link {
    background: none;
    color: var(--guto-blue-accent);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: underline;
    transition: color var(--transition-fast);
}

.btn-link:active {
    color: var(--guto-blue-bright);
}

.btn-back {
    background: rgba(255,255,255,0.1);
    color: var(--white);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    position: absolute;
    top: max(env(safe-area-inset-top, 12px), 12px);
    left: 12px;
    z-index: 20;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* Button Sizes */
.btn-xl {
    font-size: 1.2rem;
    padding: 18px 40px;
    min-height: 60px;
    width: 100%;
    max-width: 320px;
}

.btn-lg {
    font-size: 1rem;
    padding: 14px 32px;
    min-height: 52px;
    width: 100%;
    max-width: 320px;
}

.btn-md {
    font-size: 0.9rem;
    padding: 12px 24px;
    min-height: 44px;
}

.btn-sm {
    font-size: 0.8rem;
    padding: 10px 20px;
    min-height: 40px;
}

/* Pulse Glow Animation */
.pulse-glow {
    animation: pulseGlow 2s ease-in-out infinite;
}

@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 0 15px rgba(33,150,243,0.4); }
    50% { box-shadow: 0 0 30px rgba(33,150,243,0.7), 0 0 60px rgba(33,150,243,0.3); }
}

.btn-race.pulse-glow {
    animation: pulseGlowRed 2s ease-in-out infinite;
}

@keyframes pulseGlowRed {
    0%, 100% { box-shadow: 0 0 15px rgba(229,57,53,0.4); }
    50% { box-shadow: 0 0 30px rgba(229,57,53,0.7), 0 0 60px rgba(229,57,53,0.3); }
}

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

.form-group label {
    display: block;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-300);
    margin-bottom: var(--space-xs);
    letter-spacing: 0.5px;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--white);
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    -webkit-appearance: none;
    appearance: none;
}

.form-group input:focus {
    outline: none;
    border-color: var(--guto-blue-accent);
    background: rgba(255,255,255,0.12);
    box-shadow: 0 0 0 3px rgba(33,150,243,0.15);
}

.form-group input::placeholder {
    color: var(--gray-500);
}

.form-error {
    color: var(--red-light);
    font-size: 0.85rem;
    margin-bottom: var(--space-md);
    min-height: 20px;
    text-align: center;
}

/* ============================================
   LOGO STYLES
   ============================================ */
.logo-gutos, .logo-gutos-sm {
    font-family: var(--font-heading);
    font-weight: 900;
    font-style: italic;
    color: var(--white);
    text-shadow: 
        0 0 10px rgba(33,150,243,0.5),
        0 2px 4px rgba(0,0,0,0.5);
    display: block;
    line-height: 1;
}

.logo-racing, .logo-racing-sm {
    font-family: var(--font-heading);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 8px;
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: block;
    line-height: 1.2;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.5));
}

.logo-gutos {
    font-size: clamp(2.5rem, 10vw, 4rem);
}

.logo-racing {
    font-size: clamp(1.5rem, 6vw, 2.5rem);
}

.logo-gutos-sm {
    font-size: clamp(1.5rem, 5vw, 2rem);
}

.logo-racing-sm {
    font-size: clamp(0.9rem, 3vw, 1.2rem);
    letter-spacing: 5px;
}

/* ============================================
   SCROLLBAR
   ============================================ */
::-webkit-scrollbar {
    width: 4px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2);
    border-radius: 2px;
}

/* ============================================
   UTILITIES
   ============================================ */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.text-gold {
    color: var(--gold);
}

/* ============================================
   CHECKERED PATTERN
   ============================================ */
.checkered-border {
    height: 8px;
    background: repeating-conic-gradient(
        var(--white) 0% 25%,
        var(--black) 0% 50%
    ) 0 0 / 16px 16px;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@supports (padding-top: env(safe-area-inset-top)) {
    .screen {
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
    }
}