/* ============================================
   AULA DE MÚSICA - Design System
   Estilo: Moderno Minimalista (Apple/Stripe)
   ============================================ */

/* ===========================================
   CSS VARIABLES (Design Tokens)
   =========================================== */
:root {
    /* Cores principais */
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-primary-bg: #eef2ff;

    /* Cores de feedback */
    --color-success: #10b981;
    --color-success-bg: #d1fae5;
    --color-warning: #f59e0b;
    --color-warning-bg: #fef3c7;
    --color-error: #ef4444;
    --color-error-bg: #fee2e2;
    --color-info: #3b82f6;
    --color-info-bg: #dbeafe;

    /* Neutros */
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-text: #1f2937;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;
    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;

    /* Gradientes */
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-card: linear-gradient(180deg, #ffffff 0%, #f9fafb 100%);

    /* Tipografia */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Plus Jakarta Sans', var(--font-primary);

    /* Tamanhos de fonte */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;

    /* Pesos de fonte */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    --font-extrabold: 800;

    /* Espacamento */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* 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), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-card: 0 0 0 1px rgb(0 0 0 / 0.05), 0 4px 12px rgb(0 0 0 / 0.08);
    --shadow-card-hover: 0 0 0 1px rgb(0 0 0 / 0.05), 0 8px 24px rgb(0 0 0 / 0.12);

    /* Transicoes */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Container */
    --container-max: 1200px;
    --container-padding: var(--space-6);
}

/* ===========================================
   RESET & BASE
   =========================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* ===========================================
   HEADER
   =========================================== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-light);
}

.header-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-4) var(--container-padding);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-display);
    font-weight: var(--font-bold);
    font-size: var(--text-xl);
    color: var(--color-text);
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.8;
}

.logo-icon {
    font-size: var(--text-2xl);
}

.nav {
    display: flex;
    gap: var(--space-6);
}

.nav-link {
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

/* ===========================================
   HERO SECTION
   =========================================== */
.hero {
    position: relative;
    padding: var(--space-16) var(--container-padding) var(--space-20);
    background: var(--gradient-hero);
    color: white;
    overflow: hidden;
}

.hero-container {
    max-width: var(--container-max);
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-display);
    font-size: var(--text-5xl);
    font-weight: var(--font-extrabold);
    line-height: 1.1;
    margin-bottom: var(--space-6);
}

.hero-highlight {
    background: linear-gradient(135deg, #fbbf24 0%, #f97316 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--text-xl);
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto var(--space-8);
    line-height: 1.6;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    background: white;
    color: var(--color-primary-dark);
    font-weight: var(--font-semibold);
    font-size: var(--text-lg);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.hero-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* Hero Visual - Notas flutuantes */
.hero-visual {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.hero-notes {
    position: absolute;
    inset: 0;
}

.note {
    position: absolute;
    font-size: 3rem;
    opacity: 0.15;
    animation: float 6s ease-in-out infinite;
}

.note-1 { top: 20%; left: 10%; animation-delay: 0s; }
.note-2 { top: 60%; left: 20%; animation-delay: 1.5s; }
.note-3 { top: 30%; right: 15%; animation-delay: 3s; }
.note-4 { top: 70%; right: 10%; animation-delay: 4.5s; }

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(10deg); }
}

/* ===========================================
   GAMES SECTION
   =========================================== */
.games-section {
    padding: var(--space-20) var(--container-padding);
    background: var(--color-surface);
}

.games-container {
    max-width: var(--container-max);
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    text-align: center;
    margin-bottom: var(--space-3);
    color: var(--color-text);
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--text-lg);
    margin-bottom: var(--space-12);
}

.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-6);
}

/* Game Card */
.game-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--space-8);
    background: var(--gradient-card);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-card);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.game-card-active {
    cursor: pointer;
    border: 2px solid transparent;
}

.game-card-active:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
    border-color: var(--color-primary-light);
}

.game-card-soon {
    opacity: 0.6;
    cursor: default;
}

.game-card-icon {
    font-size: 3.5rem;
    margin-bottom: var(--space-4);
}

.game-card-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-2);
    color: var(--color-text);
}

.game-card-description {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
    line-height: 1.5;
}

.game-card-badge {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-full);
}

.game-card-active .game-card-badge {
    background: var(--gradient-primary);
    color: white;
}

.game-card-soon .game-card-badge {
    background: var(--color-border-light);
    color: var(--color-text-muted);
}

/* ===========================================
   ABOUT SECTION
   =========================================== */
.about-section {
    padding: var(--space-20) var(--container-padding);
    background: var(--color-bg);
}

.about-container {
    max-width: var(--container-max);
    margin: 0 auto;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
}

.about-text {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
}

.about-text p {
    margin-bottom: var(--space-4);
}

.about-text strong {
    color: var(--color-text);
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.feature {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.feature-icon {
    font-size: var(--text-2xl);
}

.feature-text {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text);
}

/* ===========================================
   FOOTER
   =========================================== */
.footer {
    margin-top: auto;
    padding: var(--space-8) var(--container-padding);
    background: var(--color-surface);
    border-top: 1px solid var(--color-border-light);
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: var(--font-semibold);
}

.footer-copyright {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ===========================================
   RESPONSIVE
   =========================================== */
@media (max-width: 768px) {
    :root {
        --container-padding: var(--space-4);
    }

    .hero {
        padding: var(--space-12) var(--container-padding) var(--space-16);
    }

    .hero-title {
        font-size: var(--text-4xl);
    }

    .hero-subtitle {
        font-size: var(--text-base);
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }

    .about-features {
        grid-template-columns: 1fr;
    }

    .nav {
        gap: var(--space-4);
    }

    .nav-link {
        font-size: var(--text-sm);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--text-3xl);
    }

    .hero-cta {
        padding: var(--space-3) var(--space-6);
        font-size: var(--text-base);
    }

    .games-grid {
        grid-template-columns: 1fr;
    }

    .game-card {
        padding: var(--space-6);
    }

    .section-title {
        font-size: var(--text-2xl);
    }
}

/* ===========================================
   UTILITIES
   =========================================== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}