/* ============================================================================
   GENBA - Japanese Vocabulary Learning Platform
   Main Stylesheet
   ============================================================================ */

/* Variables */
:root {
    /* Colors - Tokyo Night inspired palette */
    --color-bg: #1a1b26;
    --color-bg-alt: #24283b;
    --color-bg-card: #1f2335;
    --color-surface: #292e42;
    --color-border: #3b4261;
    
    --color-text: #c0caf5;
    --color-text-muted: #565f89;
    --color-text-bright: #ffffff;
    
    --color-primary: #7aa2f7;
    --color-primary-dark: #5d7ec9;
    --color-secondary: #bb9af7;
    --color-accent: #f7768e;
    
    --color-success: #9ece6a;
    --color-warning: #e0af68;
    --color-error: #f7768e;
    --color-info: #7dcfff;
    
    /* Typography */
    --font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'Space Mono', 'Menlo', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(122, 162, 247, 0.2);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

/* Base */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-bright);
    font-weight: 700;
    line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

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

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

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

/* ============================================================================
   Navbar
   ============================================================================ */

.navbar {
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) var(--space-xl);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-bright);
}

.brand-icon {
    font-size: 1.75rem;
    color: var(--color-primary);
}

.navbar-links {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.nav-link {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text-bright);
    background: var(--color-surface);
}

.nav-level {
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-surface);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary);
}

/* ============================================================================
   Buttons
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-bg);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-alt);
    border-color: var(--color-primary);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-muted);
}

.btn-ghost:hover:not(:disabled) {
    color: var(--color-text);
    background: var(--color-surface);
}

.btn-large {
    padding: var(--space-md) var(--space-xl);
    font-size: 1.125rem;
}

.btn-full {
    width: 100%;
}

/* Google OAuth Button */
.btn-google {
    background: #ffffff;
    color: #757575;
    border: 1px solid #ddd;
    position: relative;
}

.btn-google:hover:not(:disabled) {
    background: #f8f8f8;
    border-color: #c6c6c6;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.btn-google svg {
    flex-shrink: 0;
}

/* Auth Divider */
.auth-divider {
    display: flex;
    align-items: center;
    margin: var(--space-lg) 0;
    color: var(--color-text-muted);
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

.auth-divider span {
    padding: 0 var(--space-md);
    font-size: 0.875rem;
}

/* ============================================================================
   Forms
   ============================================================================ */

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 500;
    color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--space-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(122, 162, 247, 0.2);
}

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

.form-hint {
    display: block;
    margin-top: var(--space-xs);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* ============================================================================
   Cards
   ============================================================================ */

.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}

/* ============================================================================
   Hero Section
   ============================================================================ */

.hero {
    padding: var(--space-3xl) var(--space-xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    max-width: 1200px;
    margin: 0 auto;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
}

.hero-title .highlight {
    color: var(--color-primary);
    display: block;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
}

.hero-visual {
    display: flex;
    justify-content: center;
}

.demo-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    width: 100%;
    max-width: 400px;
}

.demo-japanese {
    font-size: 2rem;
    text-align: center;
    margin-bottom: var(--space-lg);
    color: var(--color-text-bright);
}

.demo-input input {
    width: 100%;
    padding: var(--space-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
}

.demo-feedback {
    margin-top: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.demo-correct {
    background: rgba(158, 206, 106, 0.1);
    color: var(--color-success);
}

/* ============================================================================
   Features Section
   ============================================================================ */

.features {
    padding: var(--space-3xl) var(--space-xl);
    background: var(--color-bg-alt);
}

.section-title {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    transition: all var(--transition-normal);
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

.feature-card h3 {
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--color-text-muted);
    margin-bottom: 0;
}

/* ============================================================================
   JLPT Levels
   ============================================================================ */

.jlpt-levels {
    padding: var(--space-3xl) var(--space-xl);
    text-align: center;
}

.level-badges {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
    margin: var(--space-xl) 0;
}

.level-badge {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 1.125rem;
}

.level-n5 { background: var(--color-success); color: var(--color-bg); }
.level-n4 { background: var(--color-info); color: var(--color-bg); }
.level-n3 { background: var(--color-warning); color: var(--color-bg); }
.level-n2 { background: var(--color-secondary); color: var(--color-bg); }
.level-n1 { background: var(--color-accent); color: var(--color-bg); }

.level-description {
    color: var(--color-text-muted);
}

/* ============================================================================
   Auth Pages
   ============================================================================ */

.page-auth .main-content {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    padding: var(--space-xl);
}

.auth-container {
    width: 100%;
    max-width: 400px;
}

.auth-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
}

.auth-title {
    text-align: center;
    margin-bottom: var(--space-sm);
}

.auth-subtitle {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.auth-form {
    margin-bottom: var(--space-lg);
}

.auth-footer {
    text-align: center;
    color: var(--color-text-muted);
}

/* ============================================================================
   Learning Page
   ============================================================================ */

.learn-container {
    max-width: 700px;
    margin: 0 auto;
    padding: var(--space-xl);
}

.sentence-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    margin-bottom: var(--space-xl);
}

.sentence-card.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    color: var(--color-text-muted);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.jlpt-badge {
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.875rem;
}

.jlpt-n5 { background: rgba(158, 206, 106, 0.2); color: var(--color-success); }
.jlpt-n4 { background: rgba(125, 207, 255, 0.2); color: var(--color-info); }
.jlpt-n3 { background: rgba(224, 175, 104, 0.2); color: var(--color-warning); }
.jlpt-n2 { background: rgba(187, 154, 247, 0.2); color: var(--color-secondary); }
.jlpt-n1 { background: rgba(247, 118, 142, 0.2); color: var(--color-accent); }

.attempt-count {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.japanese-text {
    font-size: 2.5rem;
    text-align: center;
    line-height: 1.5;
    color: var(--color-text-bright);
    padding: var(--space-xl) 0;
}

.romaji-text {
    font-size: 1.125rem;
    text-align: center;
    color: var(--color-text-muted);
    padding: var(--space-sm) 0 0;
    font-style: italic;
}

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

.card-hint {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Answer Form */
.answer-form {
    margin-bottom: var(--space-xl);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.answer-input {
    width: 100%;
    padding: var(--space-lg);
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text);
    font-family: inherit;
    font-size: 1.125rem;
    resize: none;
    transition: all var(--transition-fast);
}

.answer-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(122, 162, 247, 0.2);
}

.input-actions {
    display: flex;
    justify-content: space-between;
    gap: var(--space-md);
}

.btn-hint {
    background: var(--color-surface);
    color: var(--color-warning);
    border: 1px solid var(--color-border);
}

.btn-hint:hover {
    background: rgba(224, 175, 104, 0.1);
    border-color: var(--color-warning);
}

.btn-submit {
    flex: 1;
    max-width: 200px;
}

.keyboard-hints {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-top: var(--space-md);
}

.keyboard-hints kbd {
    background: var(--color-surface);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

/* Skip Section */
.skip-section {
    text-align: center;
}

.btn-skip {
    color: var(--color-text-muted);
}

/* ============================================================================
   Feedback Modal
   ============================================================================ */

.feedback-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
    z-index: 200;
}

.feedback-content {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

.feedback-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.feedback-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.feedback-correct .feedback-icon { background: rgba(158, 206, 106, 0.2); color: var(--color-success); }
.feedback-close .feedback-icon { background: rgba(125, 207, 255, 0.2); color: var(--color-info); }
.feedback-somewhat .feedback-icon { background: rgba(224, 175, 104, 0.2); color: var(--color-warning); }
.feedback-incorrect .feedback-icon { background: rgba(247, 118, 142, 0.2); color: var(--color-error); }

.feedback-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.score-display {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-xl);
}

.score-circle {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--color-surface);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.score-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
}

.score-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
}

.feedback-details {
    margin-bottom: var(--space-xl);
}

.detail-section {
    margin-bottom: var(--space-lg);
}

.detail-section h4 {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    margin-bottom: var(--space-sm);
}

.correct-answer {
    background: var(--color-surface);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    color: var(--color-text-bright);
    margin-bottom: var(--space-sm);
}

.japanese-answer {
    background: var(--color-surface);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    color: var(--color-primary);
    font-size: 1.125rem;
    margin-bottom: var(--space-sm);
}

.romaji-answer {
    background: rgba(122, 162, 247, 0.1);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-style: italic;
}

.keywords-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.keyword {
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.keyword-matched {
    background: rgba(158, 206, 106, 0.2);
    color: var(--color-success);
}

.keyword-missed {
    background: rgba(247, 118, 142, 0.2);
    color: var(--color-error);
}

.mastery-notification {
    background: rgba(158, 206, 106, 0.1);
    border: 1px solid var(--color-success);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-align: center;
    color: var(--color-success);
    font-weight: 600;
}

/* ============================================================================
   Hint Card
   ============================================================================ */

.hint-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-warning);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.hint-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.hint-icon {
    font-size: 1.25rem;
}

.hint-title {
    flex: 1;
    font-weight: 600;
    color: var(--color-warning);
}

.hint-close {
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: 1.25rem;
}

.hint-item {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}

.hint-label {
    color: var(--color-text-muted);
}

.hint-value {
    font-weight: 600;
}

.hint-keywords {
    display: flex;
    gap: var(--space-sm);
}

.hint-keyword {
    background: var(--color-surface);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
}

.hint-warning {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* ============================================================================
   Dashboard
   ============================================================================ */

.dashboard-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--space-xl);
}

.dashboard-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.premium-badge {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
    color: var(--color-bg);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.stat-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    text-transform: uppercase;
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.action-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: all var(--transition-normal);
}

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

.action-primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.action-primary .action-title,
.action-primary .action-desc,
.action-primary .action-icon {
    color: var(--color-bg);
}

.action-icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

.action-title {
    font-weight: 600;
    color: var(--color-text-bright);
    margin-bottom: var(--space-xs);
}

.action-desc {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Streak Display */
.streak-section,
.progress-section {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.streak-section h2,
.progress-section h2 {
    margin-bottom: var(--space-lg);
}

.streak-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
}

.streak-main {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.streak-flame {
    font-size: 4rem;
    opacity: 0.5;
    transition: all var(--transition-normal);
}

.streak-flame.active {
    opacity: 1;
    animation: flame-pulse 2s ease-in-out infinite;
}

@keyframes flame-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

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

.count-value {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-primary);
}

.count-label {
    color: var(--color-text-muted);
}

.streak-stats {
    display: flex;
    gap: var(--space-2xl);
}

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

.streak-warning {
    background: rgba(224, 175, 104, 0.1);
    border: 1px solid var(--color-warning);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    color: var(--color-warning);
}

/* ============================================================================
   Profile
   ============================================================================ */

.profile-container {
    max-width: 700px;
    margin: 0 auto;
    padding: var(--space-xl);
}

.profile-header {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.profile-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-bg);
}

.profile-info h1 {
    margin-bottom: var(--space-xs);
}

.profile-info p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.upgrade-link {
    color: var(--color-secondary);
    font-weight: 600;
}

.profile-section {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.profile-section h2 {
    margin-bottom: var(--space-lg);
}

/* ============================================================================
   Footer
   ============================================================================ */

.footer {
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl);
    text-align: center;
    margin-top: auto;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer p {
    color: var(--color-text-muted);
    margin: 0;
}

/* ============================================================================
   Utilities
   ============================================================================ */

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.htmx-indicator {
    display: none;
}

.htmx-request .htmx-indicator {
    display: inline-flex;
}

.alert {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.alert-error {
    background: rgba(220, 38, 38, 0.15);
    border: 2px solid #dc2626;
    color: #fee2e2;
    font-weight: 500;
    box-shadow: 0 0 0 1px rgba(220, 38, 38, 0.2);
}

/* ============================================================================
   Responsive
   ============================================================================ */

@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding: var(--space-2xl) var(--space-lg);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .japanese-text {
        font-size: 1.75rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .profile-header {
        flex-direction: column;
        text-align: center;
    }
}

/* ============================================================================
   Furigana and Kanji Styles
   ============================================================================ */

/* HTML Ruby support for furigana */
ruby {
    ruby-align: center;
    ruby-position: over;
}

rt {
    font-size: 0.5em;
    color: var(--color-text-muted);
    font-weight: 400;
}

/* Sentence card header actions */
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.header-actions {
    display: flex;
    gap: var(--space-sm);
}

/* Furigana and kanji toggle buttons */
.btn-furigana-toggle,
.btn-kanji-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-furigana-toggle:hover,
.btn-kanji-toggle:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-furigana-toggle.active,
.btn-kanji-toggle.active {
    background: rgba(122, 162, 247, 0.2);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.icon-furigana {
    font-size: 0.875rem;
}

.icon-kanji {
    font-size: 0.875rem;
}

/* Japanese text container */
.japanese-text-container {
    position: relative;
}

.japanese-text.with-furigana ruby {
    line-height: 2;
}

.japanese-text.with-furigana rt {
    display: inline;
}

/* Kanji breakdown panel */
.kanji-breakdown-panel {
    margin-top: var(--space-lg);
    padding: var(--space-lg);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.kanji-breakdown-empty {
    text-align: center;
    color: var(--color-text-muted);
    padding: var(--space-md);
}

.kanji-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: var(--space-md);
}

.kanji-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-align: center;
    position: relative;
    transition: all var(--transition-fast);
}

.kanji-item:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.kanji-char {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text-bright);
    margin-bottom: var(--space-xs);
}

.kanji-readings {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    justify-content: center;
    margin-bottom: var(--space-xs);
}

.kanji-readings .reading {
    font-size: 0.75rem;
    color: var(--color-primary);
    background: rgba(122, 162, 247, 0.1);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

.kanji-meanings {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    justify-content: center;
}

.kanji-meanings .meaning {
    font-size: 0.7rem;
    color: var(--color-text-muted);
}

/* Kanji mastery badges */
.kanji-mastery {
    margin-top: var(--space-xs);
    font-size: 0.625rem;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-transform: uppercase;
}

.kanji-mastery.mastery-new {
    background: rgba(118, 119, 122, 0.2);
    color: #76767a;
}

.kanji-mastery.mastery-learning {
    background: rgba(224, 175, 104, 0.2);
    color: var(--color-warning);
}

.kanji-mastery.mastery-reviewing {
    background: rgba(125, 207, 255, 0.2);
    color: var(--color-info);
}

.kanji-mastery.mastery-mastered {
    background: rgba(158, 206, 106, 0.2);
    color: var(--color-success);
}

/* Furigana-only toggle mode */
@media (max-width: 768px) {
    .kanji-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        gap: var(--space-sm);
    }

    .kanji-char {
        font-size: 1.5rem;
    }
}