/* ==============================================
   Переменные шрифтов и цветов
   =============================================== */
:root {
    --font-family-main: 'Montserrat', sans-serif;
    --color-bg: #0a0a0a;
    --color-text: #eee;
    --color-text-muted: #ccc;
    --color-accent: #f5a623;
    --color-accent-hover: #ffa726;
    --color-navbar-bg: #111111;
}

/* ==============================================
   Глобальные базовые стили
   =============================================== */
body {
    margin: 0;
    font-family: var(--font-family-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    padding-top: 60px; /* Чтобы контент не перекрывался navbar из-за fixed */
}

h1, h2, h3 {
    font-weight: 800;
    letter-spacing: 1.2px;
    color: var(--color-accent);
    margin-top: 0;
}

p {
    font-weight: 400;
    color: var(--color-text-muted);
    max-width: 700px;
}

/* ==============================================
   Навигационная панель (Navbar)
   =============================================== */
.custom-navbar {
    background-color: var(--color-navbar-bg);
    border-bottom: 2px solid var(--color-accent);
    padding: 1rem 0;
    width: 100%;
    position: fixed;  /* Фиксируем navbar сверху */
    top: 0;
    left: 0;
    z-index: 10000;
    font-weight: 600;
    box-shadow: 0 2px 6px rgba(0,0,0,0.8);
}

.custom-navbar .container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.custom-navbar .brand {
    font-size: 1.5rem;
    color: var(--color-accent);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: color 0.3s ease;
    z-index: 11000;
}

.custom-navbar .brand img {
    height: 24px;
    width: 24px;
    filter: invert(57%) sepia(91%) saturate(571%) hue-rotate(11deg) brightness(94%) contrast(85%);
}

.custom-navbar .brand:hover {
    color: var(--color-accent-hover);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: #ddd;
    text-decoration: none;
    font-weight: 600;
    position: relative;
    padding: 5px 0;
    transition: color 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-accent);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 3px;
    background-color: var(--color-accent);
    bottom: -6px;
    left: 0;
    border-radius: 3px;
}

/* Скрываем чекбокс и label гамбургера по умолчанию */
.nav-toggle {
    display: none;
}

.nav-toggle-label {
    display: none;
    cursor: pointer;
    width: 28px;
    height: 20px;
    position: relative;
    z-index: 1100;
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
    display: block;
    background-color: var(--color-accent);
    position: absolute;
    height: 3px;
    width: 28px;
    border-radius: 2px;
    transition: 0.3s ease;
}

.nav-toggle-label span {
    top: 50%;
    transform: translateY(-50%);
}

.nav-toggle-label span::before {
    content: '';
    top: -8px;
}

.nav-toggle-label span::after {
    content: '';
    bottom: -8px;
}

/* ==============================================
   Прочие секции и общий контент
   =============================================== */
section {
    padding: 80px 20px 40px;
    max-width: 900px;
    margin: 0 auto;
}

#fullscreen-video-section {
    position: relative;
    height: 60vh;
    overflow: hidden;
}

#fullscreen-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.4);
}

#video-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--color-accent);
    font-weight: 800;
    font-size: 3rem;
    text-shadow: 1px 1px 8px #000;
}

/* Табы */
.tabs {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.tab-button {
    background: #222;
    color: #aaa;
    border: none;
    padding: 10px 20px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.tab-button.active,
.tab-button:hover {
    background-color: var(--color-accent);
    color: #111;
}

/* ==============================================
   Скрытые и видимые секции форм (step1, step2)
   =============================================== */
.step1, .step2 {
    transition: opacity 0.3s ease;
}

.step1.hidden, .step2.hidden {
    opacity: 0;
    pointer-events: none;
    height: 0;
    overflow: hidden;
    transition: opacity 0.3s ease, height 0.3s ease;
}

.step2 {
    display: none;
}

.step2.visible {
    display: block;
    opacity: 1;
    pointer-events: auto;
    height: auto;
}

/* ==============================================
   Кнопки и формы
   =============================================== */
button {
    background-color: var(--color-accent);
    border: none;
    padding: 12px 24px;
    font-weight: 800;
    color: #111;
    cursor: pointer;
    border-radius: 6px;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: var(--color-accent-hover);
}

input[type=text],
input[type=email],
input[type=tel] {
    padding: 10px;
    border-radius: 4px;
    border: 1px solid #444;
    background-color: #222;
    color: var(--color-text);
    margin-bottom: 10px;
    font-size: 1rem;
    width: 100%;
    box-sizing: border-box;
}

input::placeholder {
    color: #888;
}

/* ==============================================
   Лоадер (круговая анимация)
   =============================================== */
.loader {
    border: 5px solid #222;
    border-top: 5px solid var(--color-accent);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
    display: none;
}

@keyframes spin {
    0% { transform: rotate(0deg);}
    100% { transform: rotate(360deg);}
}

/* ==============================================
   Поле загрузки файла (custom)
   =============================================== */
input[type="file"] {
    display: none;
}

.custom-file-upload {
    display: inline-block;
    padding: 10px 25px;
    cursor: pointer;
    color: #121212;
    background-color: var(--color-accent);
    border-radius: 6px;
    font-weight: 800;
    font-family: var(--font-family-main);
    transition: background-color 0.3s ease, color 0.3s ease;
    box-shadow: 0 4px 8px rgba(245, 166, 35, 0.5);
    user-select: none;
}

.custom-file-upload:hover {
    background-color: var(--color-accent-hover);
    color: #000;
}

.file-name {
    margin-left: 15px;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-style: italic;
}

/* ==============================================
   Радио кнопки
   =============================================== */
.radio-group label {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-right: 20px;
    cursor: pointer;
    font-weight: 600;
    color: #ddd;
    font-family: var(--font-family-main);
    user-select: none;
    transition: color 0.3s ease;
}

.radio-group input[type="radio"] {
    appearance: none;
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border: 3px solid var(--color-accent);
    border-radius: 50%;
    background-color: #111;
    cursor: pointer;
    position: relative;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.radio-group input[type="radio"]:checked {
    background-color: var(--color-accent);
    border-color: var(--color-accent-hover);
}

.radio-group input[type="radio"]:focus {
    outline: none;
    box-shadow: 0 0 8px var(--color-accent);
}

.radio-group label:hover {
    color: var(--color-accent);
}

/* ==============================================
   Слайдер и поле ввода (одна строка)
   =============================================== */
.slider-inputs {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: flex-start;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 300px;
    height: 6px;
    border-radius: 4px;
    background: #333;
    cursor: pointer;
    box-shadow: none;
    outline: none !important;
    border: none;
    transition: box-shadow 0.3s ease;
}

input[type="range"]:hover {
    box-shadow: 0 0 6px var(--color-accent);
}

input[type="range"]:focus {
    box-shadow: 0 0 8px var(--color-accent-hover);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--color-accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 0 6px var(--color-accent);
    transition: box-shadow 0.3s ease;
}

input[type="range"]:focus::-webkit-slider-thumb {
    box-shadow: 0 0 12px var(--color-accent-hover);
}

input[type="text"]#output {
    width: 4ch;
    padding: 8px 6px;
    border-radius: 6px;
    border: 1px solid #444;
    background-color: #222;
    color: var(--color-text);
    font-weight: 600;
    font-family: var(--font-family-main);
    text-align: center;
    transition: border-color 0.3s ease;
}

input[type="text"]#output:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 8px var(--color-accent) inset;
}

/* ==============================================
   Мобильная адаптация navbar
   =============================================== */
@media (max-width: 768px) {
    .custom-navbar {
        padding: 0.75rem 1rem;
        height: 60px;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 11000;
        background-color: var(--color-navbar-bg);
        border-bottom: 2px solid var(--color-accent);
    }

    .custom-navbar .container {
        justify-content: space-between;
        align-items: center;
        position: relative;
        max-width: 100%;
        padding: 0;
    }

    .custom-navbar .brand {
        font-size: 1.3rem;
        gap: 8px;
        padding-left: 10px;
        z-index: 12000;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        position: fixed;
        top: 60px;
        left: 0;
        background-color: var(--color-navbar-bg);
        border-top: 2px solid var(--color-accent);
        padding: 20px 0;
        z-index: 10999;
    }

    #nav-toggle:checked + .nav-toggle-label + .nav-links {
        display: flex;
    }

    .nav-links li {
        width: 100%;
        border-bottom: 1px solid #222;
        margin: 0;
    }

    .nav-links a {
        display: block;
        padding: 15px 20px;
        font-size: 1.15rem;
        color: #ddd;
        font-weight: 600;
        transition: background-color 0.3s ease;
        width: 100%;
    }

    .nav-links a:hover,
    .nav-links a.active {
        background-color: var(--color-accent);
        color: #111;
    }

    .nav-toggle-label {
        display: flex;
        cursor: pointer;
        width: 35px;
        height: 25px;
        align-items: center;
        justify-content: center;
        position: relative;
        z-index: 12000;
        margin-right: 30px; /* сдвиг гамбургера влево */
        user-select: none;
    }

    .nav-toggle-label span,
    .nav-toggle-label span::before,
    .nav-toggle-label span::after {
        width: 28px;
        height: 3px;
        background-color: var(--color-accent);
        border-radius: 2px;
        display: block;
        position: relative;
        transition: all 0.3s ease;
    }

    .nav-toggle-label span::before {
        content: "";
        position: absolute;
        top: -8px;
        left: 0;
    }

    .nav-toggle-label span::after {
        content: "";
        position: absolute;
        top: 8px;
        left: 0;
    }
}