@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Outfit:wght@400;600;700;800&display=swap');

:root {
    --aurora-bg1: #f5ebed;
    --aurora-bg2: #cec4f5;
    --aurora-main1: #93c9e9;
    --aurora-main2: #f1dbfc;
    
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --primary: #5e60ce;
    --primary-hover: #4f46e5;
    --primary-light: #e0e7ff;
    
    --secondary: #0a7ea4;
    --secondary-hover: #0284c7;
    --secondary-light: #e0f2fe;
    
    --success: #10b981;
    --success-light: #ecfdf5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(226, 232, 240, 0.8);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    overflow-x: hidden;
}

.container {
    max-width: 1040px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
}

/* Aurora background blobs */
.aurora-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 600px;
    z-index: -2;
    overflow: hidden;
    pointer-events: none;
}

.aurora-blob-1 {
    position: absolute;
    top: -150px;
    right: -100px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(147, 201, 233, 0.5) 0%, rgba(245, 235, 237, 0.1) 70%);
    filter: blur(80px);
    border-radius: 50%;
}

.aurora-blob-2 {
    position: absolute;
    top: -50px;
    left: -200px;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(206, 196, 245, 0.5) 0%, rgba(241, 219, 252, 0.1) 70%);
    filter: blur(100px);
    border-radius: 50%;
}

/* Language switcher & Header */
.top-nav {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding: 20px 0;
}

.language-switcher {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    padding: 6px 16px;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

.language-switcher a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
    margin: 0 4px;
}

.language-switcher a:hover {
    color: var(--primary);
}

header {
    padding: 40px 0 60px 0;
    text-align: center;
}

.hero-vertical {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 40px;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-content h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin: 0 0 20px 0;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

.hero-graphic {
    display: flex;
    justify-content: center;
    position: relative;
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
}

.hero-graphic img {
    width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--glass-border);
    transition: transform 0.3s;
}

.hero-graphic img:hover {
    transform: translateY(-4px);
}

/* Beta Card */
.beta-box {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(16px);
    padding: 40px;
    border-radius: 24px;
    margin: 40px 0;
    box-shadow: var(--shadow-xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.beta-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.beta-box h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 2rem;
    margin: 0 0 12px 0;
    font-weight: 700;
}

.beta-box p.intro-text {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin: 0 0 32px 0;
}

.steps-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    max-width: 800px;
    margin: 0 auto 32px auto;
}

@media (max-width: 640px) {
    .steps-container {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}

.step-card {
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(226, 232, 240, 0.5);
    border-radius: 16px;
    padding: 24px;
    text-align: left;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.2s, box-shadow 0.2s;
}

.step-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.step-header {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
}

.step-number {
    background: var(--primary);
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-right: 12px;
    font-family: 'Outfit', sans-serif;
    box-shadow: 0 2px 4px rgba(94, 96, 206, 0.4);
}

.step-card h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.2rem;
    margin: 0;
    font-weight: 600;
}

.step-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 8px 0 20px 0;
    line-height: 1.5;
    flex-grow: 1;
}

.cta-button {
    display: block;
    background: var(--primary);
    color: white;
    text-align: center;
    padding: 12px 24px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.2s, transform 0.1s, box-shadow 0.2s;
    box-shadow: 0 4px 12px rgba(94, 96, 206, 0.3);
}

.cta-button:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 6px 16px rgba(94, 96, 206, 0.45);
}

.cta-button.secondary {
    background: var(--secondary);
    box-shadow: 0 4px 12px rgba(10, 126, 164, 0.3);
}

.cta-button.secondary:hover {
    background-color: var(--secondary-hover);
    box-shadow: 0 6px 16px rgba(10, 126, 164, 0.45);
}

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

.beta-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

/* Features Section */
#features {
    padding: 80px 0;
    position: relative;
}

#features h2.section-title {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 50px;
    font-weight: 700;
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

.feature-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    border-radius: 24px;
    padding: 32px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.feature-card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.feature-icon-wrapper {
    background: var(--primary-light);
    color: var(--primary);
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.feature-card.secondary-color .feature-icon-wrapper {
    background: var(--secondary-light);
    color: var(--secondary);
}

.feature-card h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    margin: 0;
    font-weight: 700;
}

.feature-card p.feature-desc {
    color: var(--text-secondary);
    font-size: 1rem;
    margin: 0 0 24px 0;
    line-height: 1.6;
}

/* CSS UI Mockups */
.mockup-container {
    background: var(--bg-secondary);
    border: 1px solid rgba(226, 232, 240, 0.8);
    border-radius: 16px;
    padding: 16px;
    margin-top: auto;
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 0.875rem;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

/* 1. Import Mockup */
.mockup-import {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.mockup-tab-group {
    display: flex;
    gap: 6px;
    border-bottom: 1px solid #cbd5e1;
    padding-bottom: 6px;
}
.mockup-tab {
    padding: 4px 10px;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.75rem;
    color: var(--text-muted);
}
.mockup-tab.active {
    background: var(--primary-light);
    color: var(--primary);
}
.mockup-input-bar {
    display: flex;
    gap: 8px;
}
.mockup-input {
    flex-grow: 1;
    background: white;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.mockup-btn {
    background: var(--primary);
    color: white;
    border-radius: 8px;
    padding: 8px 14px;
    font-weight: 600;
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 2. Vocabulary & Grammar Mockup */
.mockup-vocab-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.mockup-item-row {
    background: white;
    border-radius: 10px;
    padding: 10px 12px;
    border: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.mockup-word-info {
    display: flex;
    flex-direction: column;
}
.mockup-word-kanji {
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-primary);
}
.mockup-word-reading {
    font-size: 0.75rem;
    color: var(--text-muted);
}
.mockup-word-meaning {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 2px;
}
.mockup-tag {
    background: #f1f5f9;
    color: var(--text-secondary);
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 600;
}
.mockup-tag.level-n3 {
    background: var(--secondary-light);
    color: var(--secondary);
}
.mockup-tag.level-n4 {
    background: var(--primary-light);
    color: var(--primary);
}

/* 3. Reader Mockup */
.mockup-reader {
    background: white;
    border-radius: 12px;
    padding: 16px;
    border: 1px solid #e2e8f0;
    line-height: 1.8;
    color: var(--text-primary);
}
.mockup-reader-text {
    font-size: 0.95rem;
}
.mockup-clickable-word {
    background: var(--primary-light);
    border-bottom: 2px solid var(--primary);
    padding: 0 2px;
    cursor: pointer;
    border-radius: 2px;
    font-weight: 500;
}
.mockup-popover {
    margin-top: 10px;
    background: var(--text-primary);
    color: white;
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 0.75rem;
    box-shadow: var(--shadow-md);
    position: relative;
}
.mockup-popover::after {
    content: '';
    position: absolute;
    top: -6px;
    left: 30px;
    border-width: 0 6px 6px 6px;
    border-style: solid;
    border-color: transparent transparent var(--text-primary) transparent;
}
.mockup-popover-title {
    font-weight: 700;
    color: #a5b4fc;
}

/* 4. Chat Mockup */
.mockup-chat {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.mockup-message {
    display: flex;
    gap: 8px;
    max-width: 85%;
}
.mockup-message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}
.mockup-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--secondary-light);
    color: var(--secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.75rem;
}
.mockup-avatar.sakura {
    background: var(--aurora-bg2);
    color: var(--primary);
}
.mockup-bubble {
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 8px 12px;
    font-size: 0.8rem;
    box-shadow: var(--shadow-sm);
}
.mockup-message.user .mockup-bubble {
    background: var(--primary);
    color: white;
    border: none;
}
.mockup-feedback-card {
    background: var(--success-light);
    border: 1px solid #a7f3d0;
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 0.75rem;
}
.mockup-feedback-header {
    display: flex;
    justify-content: space-between;
    font-weight: 700;
    color: #065f46;
    margin-bottom: 4px;
}
.mockup-feedback-item {
    color: #047857;
}
.mockup-feedback-item.del {
    text-decoration: line-through;
    color: var(--danger);
}
.mockup-feedback-item.ins {
    font-weight: 600;
    color: var(--success);
}

/* 5. Taboo Game Mockup */
.mockup-taboo {
    background: white;
    border-radius: 14px;
    border: 1px solid #e2e8f0;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.mockup-taboo-title {
    display: flex;
    justify-content: space-between;
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-bottom: 1px solid #e2e8f0;
    padding-bottom: 4px;
}
.mockup-taboo-target {
    background: var(--danger-light);
    border: 1px dashed var(--danger);
    border-radius: 8px;
    padding: 8px;
    text-align: center;
}
.mockup-taboo-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
}
.mockup-taboo-word {
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--danger);
    font-family: 'Outfit', sans-serif;
}
.mockup-taboo-forbidden {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
}
.mockup-taboo-chip {
    background: #f1f5f9;
    border: 1px solid #cbd5e1;
    color: var(--text-secondary);
    font-size: 0.72rem;
    padding: 2px 8px;
    border-radius: 6px;
    text-decoration: line-through;
}
.mockup-taboo-desc-box {
    background: #faf5ff;
    border: 1px solid #ebd5ff;
    border-radius: 8px;
    padding: 8px 10px;
    font-style: italic;
    font-size: 0.78rem;
    color: #6b21a8;
}
.mockup-taboo-guess {
    font-size: 0.78rem;
    background: var(--success-light);
    color: #065f46;
    padding: 6px 10px;
    border-radius: 8px;
    border: 1px solid #a7f3d0;
    font-weight: 500;
    text-align: center;
}

/* Footer */
footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid #e2e8f0;
    padding: 40px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

footer p {
    margin: 4px 0;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 16px 0 0 0;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

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