/* ===== Токены ===== */
:root {
    --color-ink: #1a1a1a;
    --color-ink-hover: #333;
    --color-muted: #666;
    --color-faint: #999;
    --color-surface: #ffffff;
    --color-bg-alt: #f5f5f5;
    --color-line: rgba(0, 0, 0, 0.1);
    --color-line-soft: rgba(0, 0, 0, 0.06);
    --color-border-strong: rgba(15, 15, 15, 0.2);
    --color-contrast-bg: #1a1a1a;
    --color-contrast-bg-hover: #333;
    --color-contrast-text: #ffffff;
    --color-accent: #b45309;
    --color-accent-soft: rgba(180, 83, 9, 0.09);
    --color-watermark: rgba(26, 26, 26, 0.07);
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-card-hover: 0 12px 28px rgba(0, 0, 0, 0.12);
    --shadow-pop: 0 8px 32px rgba(0, 0, 0, 0.15);
    --transition: 0.3s ease;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-ink: #f0efea;
        --color-ink-hover: #ffffff;
        --color-muted: #a6a49e;
        --color-faint: #75736d;
        --color-surface: #201f1d;
        --color-bg-alt: #2a2927;
        --color-line: rgba(255, 255, 255, 0.12);
        --color-line-soft: rgba(255, 255, 255, 0.07);
        --color-border-strong: rgba(255, 255, 255, 0.24);
        --color-contrast-bg: #f0efea;
        --color-contrast-bg-hover: #ffffff;
        --color-contrast-text: #171717;
        --color-accent: #e0a458;
        --color-accent-soft: rgba(224, 164, 88, 0.13);
        --color-watermark: rgba(240, 239, 234, 0.06);
        --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.4);
        --shadow-card-hover: 0 12px 28px rgba(0, 0, 0, 0.5);
        --shadow-pop: 0 8px 32px rgba(0, 0, 0, 0.5);
    }
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    background: linear-gradient(135deg, #ffffff 0%, #f5f5f5 100%);
    color: var(--color-ink);
    line-height: 1.6;
}

@media (prefers-color-scheme: dark) {
    body {
        background: linear-gradient(135deg, #1b1a18 0%, #121110 100%);
    }
}

:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* Каркас: шапка, растянутый контент, футер у низа страницы */
.page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.page > main {
    flex: 1;
}

/* ===== Шапка ===== */
.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 2rem;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-line);
    animation: slideDown 0.6s ease-out;
}

.logo-link {
    text-decoration: none;
    color: inherit;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--color-ink);
    transition: color var(--transition);
}

.logo::after {
    content: "";
    display: inline-block;
    width: 7px;
    height: 7px;
    margin-left: 5px;
    border-radius: 50%;
    background: var(--color-accent);
    vertical-align: middle;
}

.logo-link:hover .logo {
    color: var(--color-ink-hover);
}

/* ===== Футер ===== */
.site-footer {
    background: #161616;
    color: #fff;
    text-align: center;
    padding: 2rem;
    font-size: 0.9rem;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

/* ===== Кнопки (в т.ч. кнопки-ссылки) ===== */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1.1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn:active {
    transform: translateY(-1px);
}

.btn-primary {
    background: var(--color-contrast-bg);
    color: var(--color-contrast-text);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    background: var(--color-contrast-bg-hover);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-ink);
    border: 2px solid var(--color-ink);
}

.btn-secondary:hover {
    background: var(--color-bg-alt);
    transform: translateY(-3px);
}

.btn-sm {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

/* ===== Заголовок секции ===== */
.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 3rem;
}

/* ===== Появление карточек по порядку ===== */
.reveal {
    opacity: 0;
    animation: scaleIn 0.6s ease-out forwards;
}

.reveal:nth-child(1) { animation-delay: 0.1s; }
.reveal:nth-child(2) { animation-delay: 0.2s; }
.reveal:nth-child(3) { animation-delay: 0.3s; }
.reveal:nth-child(4) { animation-delay: 0.4s; }

/* ===== Анимации ===== */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ===== Адаптивность ===== */
@media (max-width: 640px) {
    .site-header {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-delay: 0s !important;
        transition-duration: 0.01ms !important;
    }
}