/* ==========================================================================
   1. Переменные и Сброс стилей (Reset & Custom Properties)
   ========================================================================== */
:root {
    /* Цветовая палитра */
    --color-bg-main: #070b17;
    --color-bg-surface: #0d1326;
    --color-bg-card: #111827;
    --color-accent: #63ffb3;
    --color-accent-hover: #47e59c;
    --color-text-primary: #ffffff;
    --color-text-secondary: #9ca3af;
    --color-border: rgba(99, 255, 179, 0.15);
    --color-glass-bg: rgba(13, 19, 38, 0.6);

    /* Градиенты и Свечения */
    --gradient-primary: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    --shadow-neon: 0 0 20px rgba(99, 255, 179, 0.3);
    --shadow-neon-intense: 0 0 30px rgba(99, 255, 179, 0.5);
    --shadow-card: 0 20px 40px rgba(0, 0, 0, 0.5);

    /* Шрифты и Скругления */
    --font-main: 'Inter', sans-serif;
    --radius-lg: 24px;
    --radius-md: 12px;
    --radius-sm: 8px;

    /* Адаптивная типографика через clamp() — Уменьшенный размер H2 */
    --fs-h2: clamp(1.5rem, 2vw + 0.8rem, 2.25rem);
    --fs-body: clamp(0.95rem, 0.2vw + 0.9rem, 1.15rem);
    --fs-nav: 0.95rem;

    /* Анимации */
    --transition-smooth: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

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

html {
    scroll-behavior: smooth;
    font-family: var(--font-main);
    background-color: var(--color-bg-main);
    color: var(--color-text-primary);
    overflow-x: hidden;
}

body {
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Стандартный широкий контейнер для хедера и футера */
.container {
    width: 100%;
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 clamp(1rem, 5vw, 4rem);
}

/* ШИРОКИЙ КОНТЕЙНЕР (92% от ширины экрана для содержания и текстовых блоков) */
.container-narrow {
    width: 92vw;
    max-width: 1720px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* ==========================================================================
   2. Компоненты: Кнопки и Стеклянные Панели (Glassmorphism)
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: clamp(0.75rem, 1.5vw, 1rem) clamp(1.5rem, 2.5vw, 2.5rem);
    font-family: var(--font-main);
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
    text-decoration: none;
    white-space: nowrap;
}

.btn--primary {
    background: var(--gradient-primary);
    color: var(--color-bg-main);
    box-shadow: var(--shadow-neon);
}

.btn--primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-neon-intense);
}

.btn--secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
}

.btn--secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-3px);
}

.glass-panel {
    background: var(--color-glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-card), inset 0 1px 1px rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
}

/* ==========================================================================
   3. Шапка сайта (Header)
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition-smooth);
    border-bottom: 1px solid transparent;
}

.header--scrolled {
    background: rgba(7, 11, 23, 0.75);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding: 0.75rem 0;
}

.header__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: clamp(4rem, 8vh, 6rem);
    transition: var(--transition-smooth);
}

.header--scrolled .header__container {
    height: 4rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    text-decoration: none;
    letter-spacing: 1px;
}

.logo span {
    color: var(--color-accent);
    text-shadow: 0 0 10px rgba(99, 255, 179, 0.5);
}

.nav__list {
    display: flex;
    list-style: none;
    gap: clamp(1.5rem, 3vw, 3rem);
}

.nav__link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--fs-nav);
    font-weight: 500;
    transition: var(--transition-smooth);
    position: relative;
}

.nav__link:hover, .nav__link--active {
    color: var(--color-accent);
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-neon);
}

.nav__link:hover::after {
    width: 100%;
}

.header__actions {
    display: flex;
    gap: 1rem;
}

@media (max-width: 768px) {
    .nav { display: none; }
}

/* ==========================================================================
   4. Главный экран (Hero Section) с максимальным подложечным свечением
   ========================================================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 6rem;
    overflow: hidden;
}

/* Сверхмощное панорамное свечение, убранное НА ЗАДНИЙ ПЛАН (z-index: 0) */
.hero::before {
    content: '';
    position: absolute;
    top: 5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 170vw;
    height: 850px; 
    z-index: 0;
    pointer-events: none;
    border-radius: 50%;
    
    background: radial-gradient(ellipse at center, 
        rgba(99, 255, 179, 0.7) 0%, 
        rgba(71, 229, 156, 0.3) 30%, 
        rgba(71, 229, 156, 0.05) 55%, 
        transparent 70%
    );
    
    filter: blur(80px);
    mix-blend-mode: screen;
}

.hero__bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: radial-gradient(circle at 15% 80%, rgba(13, 19, 38, 0.6) 0%, transparent 50%);
}

.hero__container {
    position: relative;
    z-index: 2;
}

/* Сама карточка Hero (чистая, без наложения неона поверх текста) */
.hero__card {
    position: relative;
    z-index: 2;
    padding: clamp(2.5rem, 6vw, 5rem);
    max-width: 960px;
    text-align: center;
    margin: 0 auto;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.7);
}

/* Большой, жирный и красивый заголовок с неоновой поддержкой */
.hero__title {
    font-size: clamp(2.5rem, 5.5vw + 1rem, 5.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 2rem;
    letter-spacing: -0.03em;
    
    background: linear-gradient(180deg, #ffffff 20%, #c3c7db 70%, #9ca3af 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    
    text-shadow: 0 4px 20px rgba(255, 255, 255, 0.15), 
                 0 0 40px rgba(99, 255, 179, 0.2);
}

.hero__text {
    font-size: clamp(1.05rem, 0.3vw + 1rem, 1.3rem);
    color: var(--color-text-secondary);
    max-width: 680px;
    margin: 0 auto 3rem;
    line-height: 1.65;
}

.hero__actions {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* ==========================================================================
   4.1 Выпадающее содержание (Ширина вровень с текстовыми блоками — 92vw)
   ========================================================================== */
.toc-section {
    padding-top: 5rem; /* Хороший отступ сверху от Hero-секции */
    padding-bottom: 0;
    width: 100%;
}

.toc-accordion {
    width: 100%;
    background: var(--color-bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-smooth);
}

.toc-accordion:hover {
    border-color: rgba(99, 255, 179, 0.2);
    box-shadow: 0 0 30px rgba(99, 255, 179, 0.05);
}

.toc-accordion__trigger {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
    background: none;
    border: none;
    color: var(--color-accent);
    font-family: var(--font-main);
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.toc-accordion__icon {
    position: relative;
    width: 16px;
    height: 16px;
    transition: var(--transition-smooth);
}

.toc-accordion__icon::before,
.toc-accordion__icon::after {
    content: '';
    position: absolute;
    background-color: var(--color-accent);
    transition: var(--transition-smooth);
}

.toc-accordion__icon::before {
    top: 7px;
    left: 0;
    width: 16px;
    height: 2px;
}

.toc-accordion__icon::after {
    top: 0;
    left: 7px;
    width: 2px;
    height: 16px;
}

.toc-accordion.is-open .toc-accordion__icon {
    transform: rotate(180deg);
}

.toc-accordion.is-open .toc-accordion__icon::after {
    transform: rotate(90deg);
    opacity: 0;
}

.toc-accordion__content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.toc-accordion__list {
    list-style: none;
    padding: 0 2rem 1.5rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toc-accordion__link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 1.05rem;
    transition: var(--transition-smooth);
    display: inline-block;
}

.toc-accordion__link:hover {
    color: var(--color-text-primary);
    transform: translateX(6px);
}

/* ==========================================================================
   4.2 Текстовые блоки (Ширина 92vw)
   ========================================================================== */
.text-blocks-section {
    display: flex;
    flex-direction: column;
    padding-top: 3.5rem; 
    padding-bottom: 5rem;
    width: 100%;
}

.text-block {
    width: 100%;
    background: linear-gradient(145deg, var(--color-bg-surface), rgba(17, 24, 39, 0.3));
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-lg);
    padding: clamp(2rem, 4vw, 3.5rem);
    box-shadow: var(--shadow-card);
    transition: var(--transition-smooth);
    scroll-margin-top: 7rem;
}

.text-block:hover {
    border-color: rgba(99, 255, 179, 0.15);
    box-shadow: 0 20px 40px rgba(0,0,0,0.6), 0 0 40px rgba(99, 255, 179, 0.02);
    transform: translateY(-2px);
}

/* Главный заголовок секции H2 */
.text-block > h2 {
    font-size: var(--fs-h2);
    margin-bottom: 2.2rem; 
    color: var(--color-text-primary);
}

/* Подзаголовки внутри блока (H3) — ЧУТЬ КРУПНЕЕ И С ГАРАНТИРОВАННЫМ ОТСТУПОМ */
.text-block__title {
    font-size: clamp(1.5rem, 2.2vw, 1.95rem); /* Слегка увеличили размер для читаемости */
    font-weight: 700;
    margin-top: 3.5rem !important; /* Четкий верхний отступ от предыдущих текстов */
    margin-bottom: 0;
    color: var(--color-text-primary);
}

/* Сброс верхнего отступа только для самого первого H3, чтобы он не отваливался от шапки блока */
.text-block > .text-block__title:first-of-type,
.text-block > h2 + .text-block__title {
    margin-top: 0 !important;
}

/* Основной текст под H3 */
.text-block__text {
    font-size: var(--fs-body);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-top: 0.6rem;     /* Аккуратный прижим к своему H3 сверху */
    margin-bottom: 0;       /* Абзацы текста друг за другом идут плотно */
}

.text-block__intro{
    display:grid;
    grid-template-columns:1fr 420px;
    gap:40px;
    align-items:start;
    margin-bottom:40px;
}

.text-block__intro-content{
    min-width:0;
}

.text-block__intro-content .text-block__title{
    margin-top:0 !important;
}

.text-block__image-wrapper{
    width:100%;
}

.text-block__image{
    display:block;
    width:100%;
    height:320px;
    object-fit:cover;
    border-radius:20px;
    border:1px solid rgba(255,255,255,.05);
    box-shadow:var(--shadow-card);
    transition:.35s ease;
}

.text-block__image:hover{
    transform:scale(1.02);
}


/* ==========================================================================
   5. Информационный блок: Аккордеоны (FAQ Section)
   ========================================================================== */
.faq-section {
    padding-top: clamp(5rem, 12vh, 8rem); 
    padding-bottom: clamp(4rem, 10vh, 6rem);
}

.faq-section__title {
    font-size: var(--fs-h2);
    text-align: center;
    margin-bottom: clamp(2.5rem, 6vh, 4.5rem); 
    letter-spacing: -0.01em;
}

.accordion-group {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.accordion {
    background: var(--color-bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-smooth);
}

.accordion:hover {
    border-color: rgba(99, 255, 179, 0.2);
    box-shadow: 0 0 20px rgba(99, 255, 179, 0.03);
    background: var(--color-bg-card);
}

.accordion__trigger {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-family: var(--font-main);
    font-size: 1.1rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.accordion__title-text {
    padding-right: 1.5rem;
}

.accordion__icon {
    position: relative;
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    transition: var(--transition-smooth);
}

.accordion__icon::before,
.accordion__icon::after {
    content: '';
    position: absolute;
    background-color: var(--color-accent);
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-neon);
}

.accordion__icon::before {
    top: 9px;
    left: 2px;
    width: 16px;
    height: 2px;
}

.accordion__icon::after {
    top: 2px;
    left: 9px;
    width: 2px;
    height: 16px;
}

.accordion.is-open {
    border-color: rgba(99, 255, 179, 0.3);
    background: var(--color-bg-card);
}

.accordion.is-open .accordion__icon {
    transform: rotate(180deg);
}

.accordion.is-open .accordion__icon::after {
    transform: rotate(90deg);
    opacity: 0;
}

.accordion__content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.accordion__inner {
    padding: 0 2rem 1.5rem 2rem;
    color: var(--color-text-secondary);
    font-size: var(--fs-body);
    line-height: 1.6;
}

/* ==========================================================================
   6. Плавные анимации появления (Scroll Animations)
   ========================================================================== */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.25, 1, 0.5, 1), 
                transform 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

.fade-up.appeared {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width:1100px){

    .text-block__intro{
        grid-template-columns:1fr 320px;
        gap:30px;
    }

    .text-block__image{
        height:260px;
    }

}

@media (max-width:768px){

    .text-block__intro{
        display:flex;
        flex-direction:column-reverse;
        gap:24px;
    }

    .text-block__image{
        width:100%;
        height:auto;
        aspect-ratio:16/9;
    }

}


/* ==========================
   Очень маленькие экраны
========================== */

@media (max-width:480px){

    .text-block{
        padding:1.2rem;
    }

}

@media (max-width:768px){

    .header__actions{
        gap:8px;
    }

    .header__actions .btn{
        padding:8px 12px;
        font-size:1rem;
        min-width:auto;
    }

}

@media (max-width:480px){

    .header__actions{
        gap:6px;
    }

    .header__actions .btn{
        padding:7px 10px;
        font-size:0.7rem;
    }

}