/* === LANDING.CSS ===
 * assets/css/landing.css
 * НАЗНАЧЕНИЕ: Стили лендинга Dormeza — современная темная тема в эстетике "Tech Minimalism + Sleep Science"
 * РАЗМЕР: ~650 строк
 */

/* ============================================
   CSS VARIABLES — ЧИСТЫЕ СОВРЕМЕННЫЕ ЦВЕТА
   ============================================ */
:root {
    /* === ФОНЫ === */
    --bg-primary: hsl(0, 0%, 4%);           /* Чистый темный — почти черный */
    --bg-secondary: hsl(0, 0%, 6%);         /* Немного светлее */
    --bg-tertiary: hsl(0, 0%, 8%);          /* Еще светлее */

    /* === ТЕКСТ === */
    --text-primary: hsl(0, 0%, 98%);        /* Почти белый */
    --text-secondary: hsl(0, 0%, 75%);      /* Светло-серый */
    --text-muted: hsl(0, 0%, 55%);          /* Приглушенный серый */

    /* === ОСНОВНЫЕ ЦВЕТА (Ночная палитра) === */
    --color-primary: hsl(235, 85%, 65%);    /* Яркий индиго */
    --color-secondary: hsl(270, 70%, 68%);  /* Лавандовый */
    --color-accent: hsl(160, 75%, 55%);     /* Мятный (для успеха/здоровья) */

    /* === AI ЦВЕТА === */
    --ai-dark: #0a0a0a;
    --ai-gray: #1a1a1a;
    --ai-indigo: hsl(235, 85%, 65%);
    --ai-lavender: hsl(270, 70%, 68%);
    --ai-mint: hsl(160, 75%, 55%);
    --ai-blue: hsl(210, 90%, 60%);
    --ai-green: #10b981;

    /* === КАРТОЧКИ И ГРАНИЦЫ === */
    --card-bg: hsl(0, 0%, 7%);
    --border-color: hsl(0, 0%, 15%);

    /* === СОСТОЯНИЯ === */
    --color-success: hsl(160, 75%, 55%);
    --color-warning: hsl(45, 95%, 60%);
    --color-danger: hsl(0, 85%, 62%);

    /* === ГРАДИЕНТЫ === */
    --gradient-primary: linear-gradient(135deg, var(--ai-indigo), var(--ai-lavender));
    --gradient-card: linear-gradient(135deg, var(--card-bg) 0%, hsla(235, 85%, 65%, 0.06) 100%);
    --gradient-hero: linear-gradient(135deg, var(--ai-indigo) 0%, var(--ai-lavender) 50%, var(--ai-mint) 100%);

    /* === ТИПОГРАФИКА === */
    --font-display: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    /* === ГЕОМЕТРИЯ === */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    /* === ТЕНИ === */
    --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-elevated: 0 12px 40px rgba(0, 0, 0, 0.5);
    --shadow-dramatic: 0 4px 6px rgba(0, 0, 0, 0.1),
                       0 12px 24px hsla(235, 85%, 65%, 0.2),
                       0 24px 48px hsla(235, 85%, 65%, 0.12);

    /* === TRANSITIONS === */
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

    /* === ДОПОЛНИТЕЛЬНО === */
    --text-on-accent: #fff;
}

/* ============================================
   RESET & BASE
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
    position: relative;
}

/* Атмосферный фон со звездной ночью */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 30%, hsla(235, 85%, 65%, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, hsla(270, 70%, 68%, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, hsla(160, 75%, 55%, 0.04) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

body > * {
    position: relative;
    z-index: 1;
}

img {
    max-width: 100%;
    display: block;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--ai-lavender);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   SECTION TITLES
   ============================================ */
.section__title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section__subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 1.125rem;
    margin-bottom: 64px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* ============================================
   BUTTON
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 1rem;
    padding: 16px 36px;
    border-radius: 50px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-bounce);
    text-decoration: none;
    line-height: 1.4;
    white-space: nowrap;
}

.btn--primary {
    background: var(--gradient-primary);
    color: var(--text-on-accent);
    box-shadow: 0 6px 28px hsla(235, 85%, 65%, 0.35);
}

.btn--primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 40px hsla(235, 85%, 65%, 0.5);
    color: var(--text-on-accent);
}

.btn--large {
    padding: 20px 48px;
    font-size: 1.2rem;
}

.btn--secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.btn--secondary:hover {
    transform: translateY(-2px);
    background: var(--bg-tertiary);
    border-color: var(--color-primary);
    color: var(--text-primary);
    box-shadow: 0 8px 24px hsla(235, 85%, 65%, 0.25);
}

.btn--small {
    padding: 10px 20px;
    font-size: 0.9rem;
}

.btn svg {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

.btn--small svg {
    width: 18px;
    height: 18px;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 140px 0 120px;
    overflow: hidden;
}

/* Admin buttons - top right */
.hero__admin-btns {
    position: absolute;
    top: 32px;
    right: 32px;
    display: flex;
    gap: 12px;
    z-index: 100;
}

@media (max-width: 768px) {
    .hero__admin-btns {
        top: 20px;
        right: 20px;
        gap: 8px;
    }
}

/* Звезды на фоне */
.hero__stars {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(1.5px 1.5px at 15% 25%, hsla(235, 85%, 85%, 0.8) 0%, transparent 100%),
        radial-gradient(1px 1px at 35% 60%, hsla(270, 70%, 85%, 0.6) 0%, transparent 100%),
        radial-gradient(2px 2px at 60% 18%, hsla(235, 85%, 85%, 0.9) 0%, transparent 100%),
        radial-gradient(1px 1px at 75% 45%, hsla(160, 75%, 85%, 0.5) 0%, transparent 100%),
        radial-gradient(1.5px 1.5px at 88% 72%, hsla(235, 85%, 85%, 0.7) 0%, transparent 100%),
        radial-gradient(1px 1px at 22% 85%, hsla(270, 70%, 85%, 0.6) 0%, transparent 100%),
        radial-gradient(1.5px 1.5px at 48% 55%, hsla(235, 85%, 85%, 0.4) 0%, transparent 100%),
        radial-gradient(1px 1px at 92% 12%, hsla(160, 75%, 85%, 0.55) 0%, transparent 100%);
    animation: starsTwinkle 6s ease-in-out infinite alternate;
}

@keyframes starsTwinkle {
    0% { opacity: 0.7; }
    100% { opacity: 1; }
}

/* Центральное свечение */
.hero__glow {
    position: absolute;
    width: 800px;
    height: 800px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, hsla(235, 85%, 65%, 0.15) 0%, hsla(270, 70%, 68%, 0.08) 40%, transparent 70%);
    pointer-events: none;
    animation: glowPulse 8s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 1; transform: translate(-50%, -50%) scale(1.1); }
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 50px;
    background: hsla(235, 85%, 65%, 0.12);
    border: 1px solid hsla(235, 85%, 65%, 0.3);
    color: var(--ai-indigo);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 40px;
}

.hero__badge svg {
    width: 18px;
    height: 18px;
}

.hero__title {
    font-family: var(--font-display);
    margin-bottom: 32px;
}

.hero__title-line {
    display: block;
    font-size: clamp(3.5rem, 10vw, 6.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    background: var(--gradient-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.05;
    margin-bottom: 8px;
}

.hero__title-sub {
    display: block;
    font-size: clamp(1.4rem, 3.5vw, 2rem);
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: -0.01em;
    margin-top: 16px;
}

.hero__desc {
    max-width: 680px;
    margin: 0 auto 48px;
    color: var(--text-muted);
    font-size: 1.15rem;
    line-height: 1.7;
}

.hero__cta {
    margin-top: 16px;
}

/* ============================================
   STEPS (HOW IT WORKS)
   ============================================ */
.steps {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.steps__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

.step-card {
    position: relative;
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 40px 28px 36px;
    text-align: center;
    transition: all var(--transition-bounce);
}

.step-card:hover {
    border-color: hsla(235, 85%, 65%, 0.4);
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-dramatic);
}

.step-card__number {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.2;
    position: absolute;
    top: 16px;
    right: 24px;
    line-height: 1;
}

.step-card__icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: hsla(235, 85%, 65%, 0.12);
    color: var(--color-primary);
}

.step-card__icon svg {
    width: 32px;
    height: 32px;
}

.step-card__title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.step-card__desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ============================================
   BENEFITS (WHAT YOU GET)
   ============================================ */
.benefits {
    padding: 120px 0;
}

.benefits__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.benefit-card {
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 40px;
    transition: all var(--transition-bounce);
}

.benefit-card:hover {
    border-color: hsla(270, 70%, 68%, 0.4);
    transform: translateY(-6px);
    box-shadow: 0 12px 36px hsla(270, 70%, 68%, 0.15);
}

.benefit-card__icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    background: hsla(270, 70%, 68%, 0.12);
    color: var(--ai-lavender);
    margin-bottom: 24px;
}

.benefit-card__icon svg {
    width: 30px;
    height: 30px;
}

.benefit-card__title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.benefit-card__desc {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.7;
}

/* ============================================
   METRICS
   ============================================ */
.metrics {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.metrics__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.metric-card {
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    text-align: center;
    transition: all var(--transition-bounce);
}

.metric-card:hover {
    border-color: hsla(160, 75%, 55%, 0.4);
    transform: translateY(-6px);
    box-shadow: 0 12px 32px hsla(160, 75%, 55%, 0.2);
}

.metric-card__abbr {
    font-family: var(--font-display);
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--ai-mint);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 56px;
}

.metric-card__abbr svg {
    width: 36px;
    height: 36px;
    color: var(--ai-mint);
}

.metric-card__name {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.metric-card__desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ============================================
   FAQ
   ============================================ */
.faq {
    padding: 120px 0;
}

.faq__list {
    max-width: 800px;
    margin: 0 auto;
}

.faq__item {
    border-bottom: 1px solid var(--border-color);
}

.faq__item:first-child {
    border-top: 1px solid var(--border-color);
}

.faq__question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 26px 0;
    background: none;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    gap: 20px;
    transition: color var(--transition);
}

.faq__question:hover {
    color: var(--color-primary);
}

.faq__chevron {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform var(--transition);
}

.faq__item.is-open .faq__chevron {
    transform: rotate(180deg);
    color: var(--color-primary);
}

.faq__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq__item.is-open .faq__answer {
    max-height: 400px;
}

.faq__answer p {
    padding-bottom: 26px;
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.7;
}

/* ============================================
   FINAL CTA
   ============================================ */
.final-cta {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.final-cta__content {
    text-align: center;
    max-width: 680px;
    margin: 0 auto;
    padding: 72px 48px;
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
}

.final-cta__content::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center top, hsla(235, 85%, 65%, 0.12) 0%, transparent 60%);
    pointer-events: none;
}

.final-cta__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    margin: 0 auto 28px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: var(--text-on-accent);
    box-shadow: var(--shadow-dramatic);
}

.final-cta__icon svg {
    width: 40px;
    height: 40px;
}

.final-cta__title {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 3.5vw, 2.4rem);
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.final-cta__desc {
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 36px;
}

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

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

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(28px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
    from { transform: scale(0.92); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.fade-in {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* Staggered reveals для карточек */
.steps__grid .step-card.fade-in.is-visible:nth-child(1) { transition-delay: 0.1s; }
.steps__grid .step-card.fade-in.is-visible:nth-child(2) { transition-delay: 0.2s; }
.steps__grid .step-card.fade-in.is-visible:nth-child(3) { transition-delay: 0.3s; }
.steps__grid .step-card.fade-in.is-visible:nth-child(4) { transition-delay: 0.4s; }

.benefits__grid .benefit-card.fade-in.is-visible:nth-child(1) { transition-delay: 0.1s; }
.benefits__grid .benefit-card.fade-in.is-visible:nth-child(2) { transition-delay: 0.2s; }
.benefits__grid .benefit-card.fade-in.is-visible:nth-child(3) { transition-delay: 0.3s; }
.benefits__grid .benefit-card.fade-in.is-visible:nth-child(4) { transition-delay: 0.4s; }

.metrics__grid .metric-card.fade-in.is-visible:nth-child(1) { transition-delay: 0.1s; }
.metrics__grid .metric-card.fade-in.is-visible:nth-child(2) { transition-delay: 0.2s; }
.metrics__grid .metric-card.fade-in.is-visible:nth-child(3) { transition-delay: 0.3s; }
.metrics__grid .metric-card.fade-in.is-visible:nth-child(4) { transition-delay: 0.4s; }
.metrics__grid .metric-card.fade-in.is-visible:nth-child(5) { transition-delay: 0.5s; }
.metrics__grid .metric-card.fade-in.is-visible:nth-child(6) { transition-delay: 0.6s; }

/* ============================================
   RESPONSIVE: LAPTOP (1024px)
   ============================================ */
@media (max-width: 1024px) {
    .steps__grid { grid-template-columns: repeat(2, 1fr); }
    .metrics__grid { grid-template-columns: repeat(2, 1fr); }
    .hero { padding: 120px 0 100px; }
    .steps, .benefits, .metrics, .faq, .final-cta { padding: 100px 0; }
}

/* === RESPONSIVE: TABLET (768px) === */
@media (max-width: 768px) {
    .steps__grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
    .benefits__grid { grid-template-columns: 1fr; gap: 20px; }
    .metrics__grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
    .hero { padding: 100px 0 80px; }
    .hero__desc { font-size: 1.05rem; }
    .steps, .benefits, .metrics, .faq, .final-cta { padding: 80px 0; }
    .final-cta__content { padding: 56px 32px; }
}

/* === RESPONSIVE: SMALL TABLET (640px) === */
@media (max-width: 640px) {
    .hero__title-line { font-size: 3rem; }
    .section__title { margin-bottom: 12px; }
    .section__subtitle { margin-bottom: 48px; font-size: 1.05rem; }
    .hero { padding: 90px 0 70px; }
}

/* === RESPONSIVE: MOBILE (480px) === */
@media (max-width: 480px) {
    .steps__grid { grid-template-columns: 1fr; }
    .metrics__grid { grid-template-columns: 1fr; }
    .hero__title-line { font-size: 2.8rem; }
    .hero__badge { font-size: 0.8rem; padding: 8px 18px; }
    .btn--large { padding: 18px 36px; font-size: 1.05rem; }
    .container { padding: 0 20px; }
    .step-card { padding: 32px 24px 28px; }
    .benefit-card { padding: 32px 24px; }
}