/* Основные переменные */
:root {
    --bg: #ffffff;
    --bg-elevated: #f8fafc;
    --fg: #1e293b;
    --muted: #64748b;
    --accent: #0d9488;
    --accent-dim: #0f766e;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --card: #ffffff;
    --border: #e2e8f0;
    --code-bg: #f1f5f9;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.6;
}

/* Утилиты */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

@media (min-width: 640px) {
    .container { padding: 0 1.5rem; }
}

/* Кнопки */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, var(--accent-dim), var(--accent));
    color: white;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(13, 148, 136, 0.25);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--fg);
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    cursor: pointer;
    transition: border-color 0.2s ease, color 0.2s ease;
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Карточки */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.card-hover:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: box-shadow 0.2s ease;
}

/* Теги */
.tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(13, 148, 136, 0.1);
    color: var(--accent);
    border: 1px solid rgba(13, 148, 136, 0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
}

/* Навигация */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-links {
    display: none;
    align-items: center;
    gap: 2rem;
}

@media (min-width: 768px) {
    .nav-links { display: flex; }
}

.nav-link {
    color: var(--muted);
    text-decoration: none;
    position: relative;
    transition: color 0.2s ease;
}

.nav-link:hover { color: var(--fg); }

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
}

.nav-link:hover::after { width: 100%; }

.logo {
    height: 48px;
    width: auto;
}

.mobile-menu-btn {
    display: block;
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
}

@media (min-width: 768px) {
    .mobile-menu-btn { display: none; }
}

.mobile-menu {
    display: none;
    background: white;
    border-top: 1px solid var(--border);
    padding: 1rem;
}

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

.mobile-menu a {
    display: block;
    padding: 0.5rem 0;
    color: var(--muted);
    text-decoration: none;
}

/* Hero секция */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 5rem;
    background-image: 
        radial-gradient(circle at 100% 0%, rgba(13, 148, 136, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 0% 100%, rgba(13, 148, 136, 0.05) 0%, transparent 50%);
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

@media (min-width: 1024px) {
    .hero-inner {
        grid-template-columns: 1fr 1fr;
    }
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

@media (min-width: 640px) {
    .hero h1 { font-size: 3rem; }
}

@media (min-width: 1024px) {
    .hero h1 { font-size: 3.75rem; }
}

.hero h1 .accent { color: var(--accent); }

.hero p {
    font-size: 1.125rem;
    color: var(--muted);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--muted);
}

.hero-features span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.hero-features svg {
    width: 1rem;
    height: 1rem;
    color: var(--success);
}

/* Блок кода */
.code-block {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    font-family: 'Consolas', 'Monaco', monospace;
}

.code-header {
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    color: var(--muted);
    display: flex;
    justify-content: space-between;
}

.code-content {
    padding: 1rem;
    font-size: 0.875rem;
    overflow-x: auto;
    line-height: 1.6;
}

.code-comment { color: var(--muted); }
.code-keyword { color: #d97706; }
.code-function { color: var(--accent); }

/* Секции */
.section {
    padding: 5rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-alt {
    background: var(--bg-elevated);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
}

@media (min-width: 640px) {
    .section-title { font-size: 2.5rem; }
}

.section-subtitle {
    text-align: center;
    color: var(--muted);
    max-width: 600px;
    margin: 0 auto 4rem;
}

/* История */
.story-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.story-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.story-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(13, 148, 136, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.story-icon svg {
    width: 24px;
    height: 24px;
    color: var(--accent);
}

.story-card p {
    margin-bottom: 1rem;
    color: var(--muted);
}

.story-card p:last-child {
    margin-bottom: 0;
    color: var(--accent);
    font-weight: 500;
}

/* Сетка фич */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
    .features-grid { grid-template-columns: repeat(3, 1fr); }
}

.feature-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
}

.feature-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: box-shadow 0.2s ease;
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(13, 148, 136, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    color: var(--accent);
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

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

/* Примеры */
.examples-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 1024px) {
    .examples-grid { grid-template-columns: repeat(2, 1fr); }
}

.example-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
}

.example-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.example-bad {
    background: rgba(239, 68, 68, 0.08);
    border-left: 3px solid var(--danger);
    padding: 0.75rem;
    margin-bottom: 0.75rem;
    border-radius: 0 8px 8px 0;
}

.example-good {
    background: rgba(16, 185, 129, 0.08);
    border-left: 3px solid var(--success);
    padding: 0.75rem;
    margin-bottom: 0.75rem;
    border-radius: 0 8px 8px 0;
}

.example-accent {
    background: rgba(13, 148, 136, 0.1);
    border-left: 3px solid var(--accent);
    padding: 0.75rem;
    margin-bottom: 0.75rem;
    border-radius: 0 8px 8px 0;
}

.example-card code {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.875rem;
}

.example-card p {
    font-size: 0.875rem;
    color: var(--muted);
    margin-top: 1rem;
}

/* Табы */
.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2rem;
}

.tab-btn {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    background: white;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: background 0.2s ease, color 0.2s ease;
}

.tab-btn:hover {
    border-color: var(--accent);
}

.tab-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Шаги */
.steps-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .steps-grid { grid-template-columns: repeat(3, 1fr); }
}

.step-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(13, 148, 136, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.step-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.step-card p {
    font-size: 0.875rem;
    color: var(--muted);
    margin-bottom: 1rem;
}

.step-card ul {
    list-style: none;
    font-size: 0.875rem;
    color: var(--muted);
}

.step-card li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.step-card li svg {
    width: 1rem;
    height: 1rem;
    color: var(--success);
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.step-note {
    background: rgba(13, 148, 136, 0.05);
    border: 1px solid rgba(13, 148, 136, 0.2);
    border-radius: 8px;
    padding: 0.75rem;
    font-size: 0.75rem;
    color: var(--accent);
    margin-top: 1rem;
}

/* Лайфхак */
.lifehack {
    background: var(--card);
    border: 1px solid var(--border);
    border-left: 4px solid var(--warning);
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 2rem;
}

.lifehack h4 {
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lifehack h4 svg {
    width: 20px;
    height: 20px;
    color: var(--warning);
}

.lifehack p {
    font-size: 0.875rem;
    color: var(--muted);
}

/* Таблица */
.table-wrapper {
    overflow-x: auto;
}

.table-styled {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.table-styled th {
    background: var(--bg-elevated);
    border-bottom: 2px solid var(--accent);
    text-align: left;
    padding: 0.75rem;
    font-weight: 500;
}

.table-styled td {
    border-bottom: 1px solid var(--border);
    padding: 0.75rem;
    color: var(--muted);
}

.table-styled tr:hover td {
    background: rgba(13, 148, 136, 0.03);
}

.table-styled code {
    font-family: 'Consolas', 'Monaco', monospace;
    color: var(--fg);
}

.table-warning {
    background: rgba(239, 68, 68, 0.05);
    border-top: 1px solid rgba(239, 68, 68, 0.2);
    padding: 1rem;
    font-size: 0.875rem;
    color: var(--danger);
}

/* Аккордеон */
.accordion {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-top: 1.5rem;
}

.accordion-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    font-weight: 600;
}

.accordion-toggle:last-child {
    border-bottom: none;
}

.accordion-icon {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

.accordion-toggle.open .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.accordion-content.open {
    max-height: 500px;
}

.accordion-inner {
    padding: 1rem;
    font-size: 0.875rem;
    color: var(--muted);
}

.accordion-inner p {
    margin-bottom: 1rem;
}

.accordion-inner ul {
    margin-left: 1rem;
}

.accordion-inner li {
    margin-bottom: 0.5rem;
}

/* Безопасность */
.security-section {
    max-width: 900px;
    margin: 0 auto;
}

.security-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.security-card.border-success {
    border-left: 4px solid var(--success);
}

.security-card.border-accent {
    border-left: 4px solid var(--accent);
}

.security-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.security-card h3 svg {
    width: 20px;
    height: 20px;
    color: var(--accent);
}

.security-card ul {
    list-style: none;
}

.security-card li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    color: var(--muted);
}

.security-card li svg {
    width: 20px;
    height: 20px;
    color: var(--success);
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.security-check {
    background: var(--bg);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.security-check h4 {
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.security-check p,
.security-check ul {
    font-size: 0.875rem;
    color: var(--muted);
}

.security-check ul {
    margin-left: 1rem;
    margin-top: 0.5rem;
}

.security-check a {
    color: var(--accent);
}

/* Бонус */
.bonus-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: flex-start;
}

@media (min-width: 1024px) {
    .bonus-grid { grid-template-columns: 1fr 1fr; }
}

.bonus-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.bonus-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.bonus-card p {
    font-size: 0.875rem;
    color: var(--muted);
    margin-bottom: 1rem;
}

.bonus-card ul {
    list-style: none;
    font-size: 0.875rem;
    color: var(--muted);
}

.bonus-card li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.bonus-card li svg {
    width: 1rem;
    height: 1rem;
    color: var(--success);
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.bonus-card li.accent-item svg {
    color: var(--accent);
}

/* Скачать */
.download-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.download-card h2 {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.download-card p {
    color: var(--muted);
    margin-bottom: 2rem;
}

/* Контакты */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

@media (min-width: 768px) {
    .contact-grid { grid-template-columns: 1fr 1fr; }
}

.contact-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
}

.contact-card h3 {
    font-weight: 600;
    margin-bottom: 1rem;
}

.contact-card ul {
    list-style: none;
    font-size: 0.875rem;
    color: var(--muted);
}

.contact-card li {
    margin-bottom: 0.5rem;
}

.contact-note {
    background: var(--card);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    border-radius: 12px;
    padding: 1.5rem;
}

.contact-note p {
    margin-bottom: 1rem;
}

.contact-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

/* Футер */
.footer {
    border-top: 1px solid var(--border);
    padding: 2rem 1.5rem;
}

.footer-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-logo {
    color: var(--accent);
    font-weight: 600;
}

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

/* Анимации */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

@media (prefers-reduced-motion: reduce) {
    .fade-in {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .btn-primary:hover {
        transform: none;
    }
    .scroll-indicator {
        animation: none;
    }
}