/* Reset y Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colores principales */
    --primary: #3B82F6;
    --primary-dark: #2563EB;
    --primary-light: #60A5FA;
    --secondary: #8B5CF6;
    --success: #10B981;
    --error: #EF4444;
    
    /* Grises */
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    /* Backgrounds */
    --bg-primary: #0B0F16;
    --bg-secondary: #1A1F2E;
    --bg-tertiary: #252B3B;
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Bordes */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: #E5E7EB;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Contenedor */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Screens */
.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: block;
}

/* Estado de conexión */
.status-badge {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--bg-tertiary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    z-index: 1000;
    box-shadow: var(--shadow-xl);
    backdrop-filter: blur(10px);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--gray-400);
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.status-badge.connected .status-dot {
    background: var(--success);
}

.status-badge.disconnected .status-dot {
    background: var(--error);
}

.status-text {
    font-size: 0.875rem;
    font-weight: 500;
}

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

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-3xl) 0;
}

.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: radial-gradient(
        circle at 50% 0%,
        rgba(59, 130, 246, 0.15) 0%,
        rgba(139, 92, 246, 0.05) 50%,
        transparent 100%
    );
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

/* Logo */
.logo {
    margin: 0 auto var(--spacing-xl);
    width: 64px;
    height: 64px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

/* Title */
.hero-title {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.title-main {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 900;
    background: linear-gradient(135deg, #3B82F6, #8B5CF6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.title-sub {
    font-size: clamp(1rem, 3vw, 1.25rem);
    font-weight: 500;
    color: var(--gray-400);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--gray-400);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.7;
}

/* Code Input */
.code-input-wrapper {
    margin-bottom: var(--spacing-xl);
}

.code-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-400);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.code-inputs {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.code-digit {
    width: 52px;
    height: 64px;
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    background: var(--bg-secondary);
    border: 2px solid var(--gray-700);
    border-radius: var(--radius-lg);
    color: #FFFFFF;
    transition: all var(--transition-normal);
    font-family: 'Inter', monospace;
    text-transform: uppercase;
}

.code-digit:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-tertiary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
    transform: scale(1.05);
}

.code-digit.filled {
    border-color: var(--primary);
    background: var(--bg-tertiary);
}

.code-digit.error {
    border-color: var(--error);
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

.code-error {
    color: var(--error);
    font-size: 0.875rem;
    font-weight: 500;
    margin-top: var(--spacing-sm);
}

/* Buttons */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-xl);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(59, 130, 246, 0.5);
}

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

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: white;
    border: 1px solid var(--gray-700);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--gray-600);
}

.btn-icon {
    transition: transform var(--transition-normal);
}

.btn-primary:hover .btn-icon {
    transform: translateX(4px);
}

/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-3xl);
    border-top: 1px solid var(--gray-800);
}

@media (max-width: 768px) {
    .features {
        grid-template-columns: 1fr;
    }
}

.feature {
    text-align: center;
    padding: var(--spacing-lg);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-xs);
}

.feature-desc {
    font-size: 0.875rem;
    color: var(--gray-400);
}

/* How it Works */
.how-it-works {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-secondary);
}

.section-title {
    font-size: clamp(2rem, 5vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    background: linear-gradient(135deg, white, var(--gray-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.step {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--gray-800);
    transition: all var(--transition-normal);
}

.step:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 8px 30px rgba(59, 130, 246, 0.15);
}

.step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-lg);
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.step-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: white;
}

.step-content p {
    color: var(--gray-400);
    font-size: 0.875rem;
}

.how-it-works .btn-secondary {
    display: flex;
    margin: 0 auto;
}

/* Footer */
.footer {
    padding: var(--spacing-2xl) 0;
    text-align: center;
    border-top: 1px solid var(--gray-800);
}

.footer p {
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
}

.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary);
}

/* Loading Screen */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
}

.loading-spinner {
    width: 64px;
    height: 64px;
    border: 4px solid var(--gray-800);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-xl);
}

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

.loading-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-sm);
}

.loading-subtext {
    color: var(--gray-400);
    font-size: 0.875rem;
}

/* App Frame */
#app-frame {
    width: 100%;
    height: 100vh;
    border: none;
}

/* Responsive */
@media (max-width: 768px) {
    .code-digit {
        width: 44px;
        height: 56px;
        font-size: 1.25rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .steps {
        grid-template-columns: 1fr;
    }
    
    .step {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .code-digit {
        width: 40px;
        height: 52px;
        font-size: 1.125rem;
    }
    
    .code-inputs {
        gap: 0.375rem;
    }
}