:root {
    --color-bg: #0a0a0f;
    --color-surface: #12121a;
    --color-surface-hover: #1a1a25;
    --color-border: #2a2a3a;
    --color-text: #e8e8ef;
    --color-text-muted: #8888a0;
    --color-accent: #4ecdc4;
    --color-accent-dim: #3ba89f;
    --color-hero-gradient-start: #1a1a2e;
    --color-hero-gradient-end: #0a0a1a;
    --max-width: 1100px;
    --radius: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Segoe UI', Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.8;
}

/* Navbar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text);
}

.logo:hover {
    opacity: 1;
    color: var(--color-accent);
}

.logo-img {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 28px;
    align-items: center;
}

.nav-links a {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-accent);
    opacity: 1;
}

/* Language Switcher */
.lang-switch {
    display: flex;
    gap: 4px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 2px;
}

.lang-switch a {
    display: block;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    transition: all 0.2s;
}

.lang-switch a.active {
    background: var(--color-accent);
    color: var(--color-bg);
}

.lang-switch a:hover {
    opacity: 1;
}

/* Hero */
.hero {
    text-align: center;
    padding: 80px 0 60px;
    background: linear-gradient(180deg, var(--color-hero-gradient-start) 0%, var(--color-bg) 100%);
}

.hero-mascot {
    width: 180px;
    height: 180px;
    object-fit: contain;
    margin-bottom: 24px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
}

.cta-button {
    display: inline-block;
    padding: 14px 36px;
    background: var(--color-accent);
    color: var(--color-bg);
    border-radius: 12px;
    font-weight: 700;
    font-size: 1.05rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(78, 205, 196, 0.3);
    opacity: 1;
}

/* Features */
.features {
    padding: 80px 0;
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 48px;
    font-weight: 700;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px;
    transition: border-color 0.2s, transform 0.2s;
    text-align: center;
}

.feature-card:hover {
    border-color: var(--color-accent-dim);
    transform: translateY(-2px);
}

.feature-mascot {
    width: 80px;
    height: 80px;
    object-fit: contain;
    margin-bottom: 12px;
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    font-weight: 600;
}

.feature-card p {
    color: var(--color-text-muted);
    font-size: 0.92rem;
    line-height: 1.6;
}

/* Privacy Highlight */
.privacy-highlight {
    padding: 60px 0;
    text-align: center;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.privacy-highlight h2 {
    font-size: 1.8rem;
    margin-bottom: 16px;
}

.privacy-highlight p {
    color: var(--color-text-muted);
    max-width: 650px;
    margin: 0 auto;
    font-size: 1.05rem;
}

/* Page Content (privacy, terms, support, guide) */
.page-content {
    padding: 60px 0 80px;
}

.content-narrow {
    max-width: 760px;
}

.page-header {
    text-align: center;
    margin-bottom: 40px;
}

.page-header-mascot {
    width: 120px;
    height: 120px;
    object-fit: contain;
    margin-bottom: 16px;
}

.page-content h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.page-content .meta {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 36px;
}

.page-content h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-top: 40px;
    margin-bottom: 12px;
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
}

.page-content h2:first-of-type,
.page-header + h2 {
    border-top: none;
    padding-top: 0;
}

.page-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 24px;
    margin-bottom: 8px;
    color: var(--color-accent);
}

.page-content p {
    margin-bottom: 12px;
    color: var(--color-text-muted);
}

.page-content ul,
.page-content ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.page-content li {
    margin-bottom: 6px;
    color: var(--color-text-muted);
}

.page-content li strong {
    color: var(--color-text);
}

.page-content hr {
    border: none;
    border-top: 2px solid var(--color-border);
    margin: 60px 0;
}

/* Table of Contents (Guide) */
.toc {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px 28px;
    margin-bottom: 40px;
}

.toc h2 {
    font-size: 1rem;
    margin: 0 0 12px;
    border: none;
    padding: 0;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.toc ol {
    padding-left: 20px;
    margin-bottom: 0;
}

.toc li {
    margin-bottom: 4px;
}

/* Info Table (Guide) */
.info-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0 24px;
}

.info-table th,
.info-table td {
    padding: 10px 16px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.info-table th {
    color: var(--color-text);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-table td {
    color: var(--color-text-muted);
}

/* Contact Section (Support) */
.contact-section {
    margin-bottom: 40px;
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 16px;
}

.contact-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
}

.contact-card h3 {
    color: var(--color-text);
    margin-bottom: 8px;
    margin-top: 0;
}

/* FAQ Section (Support) */
.faq-section {
    margin-bottom: 40px;
}

.faq-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 12px;
}

.faq-item h3 {
    color: var(--color-text);
    margin-top: 0;
    margin-bottom: 8px;
    font-size: 1rem;
}

.faq-item p {
    margin-bottom: 0;
    font-size: 0.92rem;
}

/* App Info Section */
.app-info ul {
    list-style: none;
    padding: 0;
}

.app-info li {
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border);
}

/* Footer */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

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

.footer-copy {
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

.footer-contact {
    font-size: 0.85rem;
}

.footer-contact a {
    color: var(--color-text-muted);
}

/* i18n: hidden by default */
[data-lang="en"] { display: none; }
html[lang="en"] [data-lang="en"] { display: block; }
html[lang="en"] [data-lang="tr"] { display: none; }
html[lang="en"] span[data-lang="en"],
html[lang="en"] a[data-lang="en"] { display: inline; }
html[lang="en"] span[data-lang="tr"],
html[lang="en"] a[data-lang="tr"] { display: none; }
html[lang="tr"] span[data-lang="en"],
html[lang="tr"] a[data-lang="en"] { display: none; }
html[lang="tr"] span[data-lang="tr"],
html[lang="tr"] a[data-lang="tr"] { display: inline; }

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        gap: 14px;
    }

    .hero {
        padding: 60px 0 50px;
    }

    .hero-mascot {
        width: 140px;
        height: 140px;
    }

    .features {
        padding: 50px 0;
    }

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

    .contact-cards {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-content {
        flex-direction: column;
        gap: 12px;
    }

    .nav-links {
        gap: 10px;
        font-size: 0.85rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-mascot {
        width: 120px;
        height: 120px;
    }
}