:root {
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-cyan: #06b6d4;
    --gradient-main: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --font-main: 'Inter', sans-serif;
    --font-mono: 'Fira Code', monospace;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-main);
    overflow-x: hidden;
    line-height: 1.6;
}

/* ---------- Background ---------- */
body::before {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: radial-gradient(circle at 20% 20%, rgba(59,130,246,0.08) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(139,92,246,0.08) 0%, transparent 50%),
                #0f172a;
    z-index: -3;
    pointer-events: none;
}

.tech-grid {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-image:
        linear-gradient(30deg, #334155 12%, transparent 12.5%, transparent 87%, #334155 87.5%, #334155),
        linear-gradient(150deg, #334155 12%, transparent 12.5%, transparent 87%, #334155 87.5%, #334155),
        linear-gradient(30deg, #334155 12%, transparent 12.5%, transparent 87%, #334155 87.5%, #334155),
        linear-gradient(150deg, #334155 12%, transparent 12.5%, transparent 87%, #334155 87.5%, #334155),
        linear-gradient(60deg, #33415566 25%, transparent 25.5%, transparent 75%, #33415566 75%, #33415566),
        linear-gradient(60deg, #33415566 25%, transparent 25.5%, transparent 75%, #33415566 75%, #33415566);
    background-size: 80px 140px;
    background-position: 0 0, 0 0, 40px 70px, 40px 70px, 0 0, 40px 70px;
    opacity: 0.08;
    z-index: -2;
    mask-image: radial-gradient(circle at 50% 50%, black 40%, transparent 90%);
    pointer-events: none;
}

.circuit-node {
    position: fixed;
    width: 4px; height: 4px;
    background: #0ea5e9;
    box-shadow: 0 0 10px #0ea5e9, 0 0 20px #0ea5e9;
    border-radius: 50%;
    z-index: -1;
    animation: moveCircuit 10s linear infinite;
}

.cn1 { top: 20%; left: 0; animation-duration: 8s; }
.cn2 { top: 60%; left: 0; animation-duration: 12s; animation-delay: 2s; }
.cn3 { top: 40%; right: 0; animation-duration: 15s; animation-direction: reverse; }

@keyframes moveCircuit {
    0%   { transform: translateX(0); opacity: 0; }
    10%  { opacity: 1; }
    90%  { opacity: 1; }
    100% { transform: translateX(100vw); opacity: 0; }
}

/* ---------- Navigation ---------- */
nav {
    position: fixed;
    top: 0; width: 100%;
    padding: 1.2rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 1000;
    border-bottom: var(--glass-border);
    transition: background 0.3s;
}

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    font-family: var(--font-mono);
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 2rem;
    transition: color 0.3s;
    font-weight: 500;
    font-size: 0.95rem;
}

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

.hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.4rem;
    cursor: pointer;
}

/* ---------- Mobile Menu ---------- */
.mobile-menu {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.97);
    z-index: 2000;
    gap: 2rem;
    animation: fadeIn 0.2s ease;
}

.mobile-menu.open { display: flex; }

.mobile-link {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 2rem;
    font-weight: 700;
    transition: background 0.3s;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.close-menu {
    position: absolute;
    top: 1.5rem; right: 2rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.8rem;
    cursor: pointer;
}

/* ---------- Hero ---------- */
header.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 6rem 1.5rem 4rem;
    position: relative;
    overflow: hidden;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.2rem;
    border: var(--glass-border);
    border-radius: 99px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-cyan);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    letter-spacing: 0.05em;
}

header.hero h1 {
    font-size: clamp(2.8rem, 6vw, 5rem);
    font-weight: 800;
    margin-bottom: 1.2rem;
    line-height: 1.1;
    color: var(--text-primary);
}

.gradient-text {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header.hero p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 550px;
    margin-bottom: 2.5rem;
}

.cta-button {
    padding: 0.9rem 2rem;
    background: var(--gradient-main);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: transform 0.3s, box-shadow 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 28px rgba(59, 130, 246, 0.35);
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-top: 3.5rem;
    padding: 1.2rem 2.5rem;
    background: var(--bg-card);
    border: var(--glass-border);
    border-radius: 16px;
    backdrop-filter: blur(12px);
}

.stat { text-align: center; }
.stat-num {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}
.stat-label { font-size: 0.8rem; color: var(--text-secondary); margin-top: 0.2rem; display: block; }
.stat-divider { width: 1px; height: 40px; background: rgba(255,255,255,0.1); }

/* ---------- Section Shared ---------- */
.section-eyebrow {
    text-align: center;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent-cyan);
    margin-bottom: 0.75rem;
}

.section-title {
    text-align: center;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

/* ---------- Apps Section ---------- */
section.apps {
    padding: 6rem 8%;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--bg-card);
    border: var(--glass-border);
    backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 2rem;
    transition: transform 0.35s, border-color 0.3s, box-shadow 0.35s;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    color: inherit;
}

.card:hover {
    transform: translateY(-6px);
    border-color: rgba(59, 130, 246, 0.5);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card-glow {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle at top left, rgba(59,130,246,0.12) 0%, transparent 60%);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.4s;
    border-radius: 20px;
}

.card:hover .card-glow { opacity: 1; }

.card-icon {
    width: 52px; height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: white;
    margin-bottom: 1.2rem;
    flex-shrink: 0;
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 700;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.card-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.tag {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.25rem 0.75rem;
    border-radius: 99px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.07);
    color: var(--text-secondary);
    border: 1px solid rgba(255,255,255,0.07);
    transition: background 0.3s, color 0.3s;
}

.card:hover .tag {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-cyan);
    border-color: rgba(59, 130, 246, 0.3);
}

.card-arrow {
    position: absolute;
    top: 1.5rem; right: 1.5rem;
    width: 32px; height: 32px;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
    transition: background 0.3s, color 0.3s, transform 0.3s;
}

.card:hover .card-arrow {
    background: var(--gradient-main);
    color: white;
    transform: translate(3px, -3px);
}

/* ---------- About Section ---------- */
.about-section {
    padding: 6rem 8%;
    border-top: var(--glass-border);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    max-width: 1000px;
    margin: 0 auto;
}

.about-text p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
}

.contact-card {
    background: var(--bg-card);
    border: var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    backdrop-filter: blur(12px);
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.contact-item i {
    width: 36px; height: 36px;
    border-radius: 10px;
    background: rgba(59,130,246,0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-blue);
    flex-shrink: 0;
    font-size: 0.9rem;
}

.contact-item a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: color 0.2s;
}

.contact-item a:hover { color: var(--accent-cyan); text-decoration: underline; }

/* ---------- Footer ---------- */
footer {
    text-align: center;
    padding: 3rem 1rem 2rem;
    border-top: var(--glass-border);
}

.footer-logo {
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 700;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.footer-tagline {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1.2rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.2s;
}

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

.footer-sep { color: rgba(255,255,255,0.2); }

.footer-copy {
    color: rgba(148, 163, 184, 0.5);
    font-size: 0.8rem;
}

/* ---------- Legal Pages (privacy-policy, terms-of-use) ---------- */
.legal-page {
    max-width: 820px;
    margin: 0 auto;
    padding: 8rem 2rem 5rem;
}

.legal-page h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.legal-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    display: block;
}

.legal-page h2 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 2.5rem;
    margin-bottom: 0.75rem;
    border-left: 3px solid var(--accent-blue);
    padding-left: 0.75rem;
}

.legal-page p, .legal-page li {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 0.6rem;
}

.legal-page ul {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.legal-page a {
    color: var(--accent-blue);
    text-decoration: none;
}

.legal-page a:hover { text-decoration: underline; }

/* ---------- Data deletion request form ---------- */
.deletion-request-page .deletion-bilingual {
    margin-bottom: 2rem;
}

.deletion-intro {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.75;
    margin-bottom: 1rem;
}

.deletion-form {
    background: var(--bg-card);
    border: var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    margin-top: 1rem;
    backdrop-filter: blur(12px);
}

.deletion-form .form-group {
    margin-bottom: 1.35rem;
}

.deletion-form label {
    display: block;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.45rem;
}

.deletion-form .req {
    color: var(--accent-cyan);
}

.deletion-form input[type="text"],
.deletion-form input[type="email"],
.deletion-form select,
.deletion-form textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    border: 1px solid rgba(148, 163, 184, 0.25);
    background: rgba(15, 23, 42, 0.6);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 0.95rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.deletion-form input::placeholder,
.deletion-form textarea::placeholder {
    color: rgba(148, 163, 184, 0.6);
}

.deletion-form input:focus,
.deletion-form select:focus,
.deletion-form textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.deletion-form select {
    cursor: pointer;
    appearance: auto;
}

.deletion-form textarea {
    resize: vertical;
    min-height: 100px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 640px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.form-checkbox .checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1.5;
}

.form-checkbox input[type="checkbox"] {
    margin-top: 0.25rem;
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    accent-color: var(--accent-blue);
}

.form-note {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.65;
    margin: 1.25rem 0 1.5rem;
    padding: 1rem;
    background: rgba(59, 130, 246, 0.08);
    border-radius: 10px;
    border-left: 3px solid var(--accent-blue);
}

.form-note i {
    color: var(--accent-cyan);
    margin-right: 0.35rem;
}

.deletion-submit {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.95rem 1.75rem;
    font-size: 1rem;
    font-weight: 700;
    font-family: var(--font-main);
    color: #fff;
    background: var(--gradient-main);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.2s;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
}

.deletion-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(139, 92, 246, 0.4);
}

.deletion-submit:active {
    transform: translateY(0);
}

/* ---------- Animations ---------- */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    header.hero h1 { font-size: 2.4rem; }
    .hero-stats { gap: 1.2rem; padding: 1rem 1.5rem; }
    .nav-links { display: none; }
    .hamburger { display: block; }
    section.apps, .about-section { padding: 4rem 5%; }
}