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

/* === DARK THEME (default) === */
:root {
    --bg: #0a0a0f;
    --bg-card: #13131a;
    --bg-card-hover: #1a1a24;
    --border: #1e1e2e;
    --border-hover: #2a2a3a;
    --text: #e4e4e7;
    --text-dim: #71717a;
    --accent: #ef4444;
    --accent-hover: #dc2626;
    --accent-glow: rgba(239, 68, 68, 0.15);
    --header-bg: rgba(10, 10, 15, 0.85);
    --nav-bg: rgba(10, 10, 15, 0.95);
    --modal-bg: rgba(0, 0, 0, 0.7);
    --shadow: rgba(0, 0, 0, 0.3);
    --hero-h1-from: #fff;
    --hero-h1-to: #a0a0a0;
    --section-h2-from: #fff;
    --section-h2-to: #b0b0b0;
}

/* === LIGHT THEME === */
[data-theme="light"] {
    --bg: #f5f5f7;
    --bg-card: #ffffff;
    --bg-card-hover: #fafafa;
    --border: #e5e5e5;
    --border-hover: #d4d4d4;
    --text: #18181b;
    --text-dim: #71717a;
    --accent: #ef4444;
    --accent-hover: #dc2626;
    --accent-glow: rgba(239, 68, 68, 0.1);
    --header-bg: rgba(245, 245, 247, 0.85);
    --nav-bg: rgba(245, 245, 247, 0.95);
    --modal-bg: rgba(0, 0, 0, 0.4);
    --shadow: rgba(0, 0, 0, 0.08);
    --hero-h1-from: #18181b;
    --hero-h1-to: #52525b;
    --section-h2-from: #18181b;
    --section-h2-to: #52525b;
}

/* === TRANSITIONS === */
body,
.header,
.offer-card,
.feature-card,
.review-card,
.modal,
.contact-form input,
.contact-form textarea,
.footer {
    transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* === HEADER === */
.header {
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: var(--header-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 20px;
    letter-spacing: -0.02em;
}

.logo-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
}

.nav {
    display: flex;
    gap: 32px;
    align-items: center;
}

.nav a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

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

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-burger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.3s;
}

/* === THEME TOGGLE === */
.theme-toggle {
    width: 52px;
    height: 28px;
    border-radius: 14px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    cursor: pointer;
    position: relative;
    padding: 0;
    flex-shrink: 0;
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.theme-toggle-knob {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    transition: transform 0.4s cubic-bezier(0.68, -0.15, 0.27, 1.15);
    display: flex;
    align-items: center;
    justify-content: center;
}

[data-theme="light"] .theme-toggle-knob {
    transform: translateX(24px);
}

.theme-toggle-knob svg {
    width: 12px;
    height: 12px;
    color: #fff;
    transition: opacity 0.3s, transform 0.4s;
}

.theme-toggle .icon-moon {
    display: block;
}
.theme-toggle .icon-sun {
    display: none;
}

[data-theme="light"] .theme-toggle .icon-moon {
    display: none;
}
[data-theme="light"] .theme-toggle .icon-sun {
    display: block;
}

/* === HERO === */
.hero {
    padding: 100px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: -120px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 400px;
    background: radial-gradient(ellipse, rgba(239, 68, 68, 0.12) 0%, transparent 70%);
    pointer-events: none;
    transition: opacity 0.4s;
}

[data-theme="light"] .hero-glow {
    opacity: 0.6;
}

.hero h1 {
    font-size: clamp(36px, 7vw, 64px);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--hero-h1-from) 0%, var(--hero-h1-to) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.hero-sub {
    margin-top: 24px;
    font-size: 18px;
    color: var(--text-dim);
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    margin-top: 40px;
    padding: 16px 36px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.2s;
    letter-spacing: -0.01em;
}

.hero-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(239, 68, 68, 0.3);
}

/* === SECTIONS COMMON === */
.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    letter-spacing: -0.03em;
    text-align: center;
    background: linear-gradient(135deg, var(--section-h2-from) 0%, var(--section-h2-to) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-sub {
    text-align: center;
    color: var(--text-dim);
    font-size: 16px;
    margin-top: 12px;
    margin-bottom: 48px;
}

/* === OFFERS === */
.offers-section {
    padding: 80px 0;
}

.offers-tabs {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 36px;
}

.offers-tab {
    padding: 10px 24px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--bg-card);
    color: var(--text-dim);
    font-family: inherit;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.offers-tab:hover {
    border-color: var(--border-hover);
    color: var(--text);
}

.offers-tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.offers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.offers-empty {
    text-align: center;
    color: var(--text-dim);
    font-size: 14px;
    padding: 40px 16px;
    border: 1px dashed var(--border);
    border-radius: 16px;
    grid-column: 1 / -1;
}

.offer-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px 28px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.offer-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--card-accent, var(--accent));
    opacity: 0;
    transition: opacity 0.3s;
}

.offer-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 60%;
    height: 60%;
    background: radial-gradient(ellipse at bottom right, var(--card-accent, var(--accent)), transparent 70%);
    opacity: 0.07;
    pointer-events: none;
    border-radius: 0 0 16px 0;
    transition: opacity 0.3s;
}

.offer-card:hover::after {
    opacity: 0.12;
}

.offer-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px var(--shadow);
}

.offer-card:hover::before {
    opacity: 1;
}

.card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.card-bank-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    color: #fff;
    flex-shrink: 0;
}

.card-bank-logo {
    width: 80px;
    height: 80px;
    border-radius: 14px;
    object-fit: contain;
    flex-shrink: 0;
    background: #fff;
    padding: 4px;
    border: 1px solid var(--border);
}

.card-badge {
    font-size: 11px;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: 20px;
    background: var(--accent-glow);
    color: var(--accent);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.card-title {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
    line-height: 1.3;
}

.card-bank {
    font-size: 13px;
    color: var(--text-dim);
    font-weight: 500;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.card-bank::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--card-accent, var(--accent));
    flex-shrink: 0;
}

.card-desc {
    font-size: 14px;
    color: var(--text-dim);
    line-height: 1.6;
    margin-bottom: 24px;
}

.card-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--accent);
    text-decoration: none;
    transition: gap 0.2s;
}

.card-btn svg {
    width: 16px;
    height: 16px;
    transition: transform 0.2s;
}

.offer-card:hover .card-btn svg {
    transform: translateX(4px);
}

/* === SCROLL ANIMATIONS === */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* === STATS === */
.stats-section {
    padding: 60px 0;
    border-top: 1px solid var(--border);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.stat-card {
    text-align: center;
    padding: 32px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    transition: all 0.3s;
}

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

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--accent);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-dim);
    font-weight: 500;
}

/* === ABOUT / FEATURES === */
.about-section {
    padding: 80px 0;
    border-top: 1px solid var(--border);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 28px 24px;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
}

.feature-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--accent-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    color: var(--accent);
}

.feature-icon svg {
    width: 22px;
    height: 22px;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-dim);
    line-height: 1.6;
}

/* === REVIEWS === */
.reviews-section {
    padding: 80px 0;
    border-top: 1px solid var(--border);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.review-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 28px;
    transition: all 0.3s;
}

.review-card:hover {
    border-color: var(--border-hover);
}

.review-stars {
    display: flex;
    gap: 2px;
    margin-bottom: 16px;
    color: #f59e0b;
}

.review-stars svg {
    width: 16px;
    height: 16px;
}

.review-text {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text);
    margin-bottom: 20px;
    font-style: italic;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.review-avatar {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--accent), #f87171);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}

.review-photo {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    object-fit: cover;
    flex-shrink: 0;
}

.review-author span {
    font-size: 14px;
    font-weight: 600;
}

/* === CONTACT === */
.contact-section {
    padding: 80px 0;
    border-top: 1px solid var(--border);
}

.contact-form {
    max-width: 560px;
    margin: 0 auto;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text);
    font-family: inherit;
    font-size: 15px;
    transition: border-color 0.2s, background-color 0.4s;
    outline: none;
    resize: vertical;
}

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

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--accent);
}

.contact-form textarea {
    margin-bottom: 20px;
}

.form-btn {
    width: 100%;
    padding: 16px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.form-btn:hover {
    background: var(--accent-hover);
    box-shadow: 0 8px 24px rgba(239, 68, 68, 0.3);
}

/* === FAQ === */
.faq-section {
    padding: 80px 0;
    border-top: 1px solid var(--border);
}

.faq-list {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
    transition: border-color 0.3s;
}

.faq-item:hover {
    border-color: var(--border-hover);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    background: none;
    border: none;
    color: var(--text);
    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
}

.faq-question svg {
    width: 20px;
    height: 20px;
    color: var(--text-dim);
    flex-shrink: 0;
    transition: transform 0.3s;
}

.faq-item.open .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer p {
    padding: 0 24px 20px;
    font-size: 15px;
    color: var(--text-dim);
    line-height: 1.7;
}

.faq-item.open .faq-answer {
    max-height: 200px;
}

/* === CTA === */
.cta-section {
    padding: 80px 0;
    border-top: 1px solid var(--border);
}

.cta-card {
    text-align: center;
    padding: 60px 40px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    position: relative;
    overflow: hidden;
}

.cta-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #f87171);
}

.cta-card h2 {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
    color: var(--text);
}

.cta-card p {
    font-size: 16px;
    color: var(--text-dim);
    max-width: 460px;
    margin: 0 auto 32px;
    line-height: 1.6;
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 36px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.2s;
}

.cta-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(239, 68, 68, 0.3);
}

/* === FOOTER === */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border);
}

.footer-inner {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
}

.footer-copy {
    font-size: 13px;
    color: var(--text-dim);
    margin-top: 12px;
    max-width: 400px;
    line-height: 1.5;
}

.footer-contacts {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: flex-end;
}

.footer-contacts a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.footer-contacts a:hover {
    color: var(--text);
}

/* === MODAL === */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--modal-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px;
    max-width: 480px;
    width: 100%;
    position: relative;
    transform: translateY(20px) scale(0.97);
    transition: transform 0.3s, background-color 0.4s;
}

.modal-overlay.active .modal {
    transform: translateY(0) scale(1);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    border: none;
    background: var(--border);
    border-radius: 10px;
    color: var(--text-dim);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.modal-close:hover {
    background: var(--border-hover);
    color: var(--text);
}

.modal-close svg {
    width: 18px;
    height: 18px;
}

.modal-badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    padding: 5px 14px;
    border-radius: 20px;
    background: var(--accent-glow);
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    margin-bottom: 20px;
}

.modal-title {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.modal-bank {
    font-size: 14px;
    color: var(--text-dim);
    margin-bottom: 20px;
}

.modal-desc {
    font-size: 15px;
    color: var(--text-dim);
    line-height: 1.7;
    margin-bottom: 32px;
}

.modal-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 16px 32px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.2s;
}

.modal-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(239, 68, 68, 0.3);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--nav-bg);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border);
    }

    .nav.open {
        display: flex;
    }

    .nav-burger {
        display: flex;
    }

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

    .hero-sub {
        font-size: 16px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-number {
        font-size: 28px;
    }

    .cta-card {
        padding: 40px 24px;
    }

    .offers-tabs {
        flex-wrap: wrap;
    }

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

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

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

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

    .footer-inner {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .footer-contacts {
        align-items: center;
    }

    .offer-card {
        padding: 24px 20px;
    }

    .modal {
        padding: 28px 24px;
    }

    .modal-title {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .features-grid {
        gap: 12px;
    }

    .feature-card {
        padding: 20px 18px;
    }
}