/* ===================================================
   1. ОСНОВНІ НАЛАШТУВАННЯ ТА ФОН
   =================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #ffffff;
    padding-top: 70px;
    line-height: 1.6;
    background-image: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)),
                      url('https://images.unsplash.com/photo-1490645935967-10de6ba17061?q=80&w=2000');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-color: #1a1a1a;
}

/* ===================================================
   2. ШАПКА ТА НАВІГАЦІЯ
   =================================================== */
.top-header {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 70px;
    background-color: rgba(20, 50, 50, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.header-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #ffffff;
    text-decoration: none;
    flex-shrink: 0;
}

.desktop-nav {
    display: flex;
    align-items: center;
    gap: 10px;
}

.desktop-nav a {
    text-decoration: none;
    color: #ffffff;
    font-weight: 600;
    padding: 10px 15px;
    font-size: 14px;
    text-transform: uppercase;
    opacity: 0.85;
    transition: 0.3s;
    white-space: nowrap;
}

.desktop-nav a:hover {
    opacity: 1;
    color: #f1c40f;
}

/* DROPDOWN */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #ffffff;
    min-width: 220px;
    box-shadow: 0px 8px 16px rgba(0,0,0,0.2);
    z-index: 1000;
    border-radius: 8px;
    padding: 10px 0;
    overflow: hidden;
}

.dropdown-menu a {
    color: #2c3e50;
    padding: 12px 20px;
    display: block;
    text-transform: none;
    border-bottom: 1px solid #f1f1f1;
    opacity: 1;
}

.dropdown-menu a:hover {
    background-color: #f8f9fa;
    color: #e74c3c;
}

.dropdown:hover .dropdown-menu {
    display: block;
}

/* ===================================================
   3. КОНТЕНТ-БЛОКИ (ТЕМНЕ СКЛО)
   =================================================== */
.content-area, .how-it-works, .faq-section, .benefits-dark, .glass-section {
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 30px;
    margin: 40px auto;
    padding: 40px 20px;
    max-width: 1100px;
    width: 95%;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.container {
    background: transparent;
    box-shadow: none;
    width: 100%;
    padding: 0;
}

/* ===================================================
   4. ТЕКСТИ ТА ЗАГОЛОВКИ
   =================================================== */
h1, h2, .section-title, .section-title-light, .glass-title {
    color: #f1c40f;
    text-align: center;
    margin-bottom: 25px;
}

p, label, .subtitle, .slider-header label {
    color: rgba(255, 255, 255, 0.9);
}

/* ===================================================
   5. ЕЛЕМЕНТИ ФОРМ (КАЛЬКУЛЯТОР)
   =================================================== */
.activity-card, .goal-label, .step, .benefit-card, .glass-faq {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 15px;
    color: #fff;
    transition: 0.3s;
}

input[type="radio"]:checked + .card-content,
input[type="radio"]:checked + .goal-label {
    background: #27ae60;
    border-color: #27ae60;
    color: white;
}

.slider-group {
    width: 100%;
    max-width: 900px;
    margin: 20px auto;
}

.modern-slider {
    width: 100%;
    cursor: pointer;
}

#calc-form {
    width: 100%;
    max-width: 950px;
    margin: 0 auto;
    scroll-margin-top: 100px;
}

.slider-value {
    background: #f1c40f;
    color: #000;
    padding: 2px 12px;
    border-radius: 10px;
    font-weight: bold;
}

#result {
    background: rgba(0, 0, 0, 0.8);
    border: 2px solid #f1c40f;
    color: white;
    padding: 30px;
    border-radius: 20px;
    margin-top: 20px;
}

/* ===================================================
   6. КАРТКИ ТАРИФІВ
   =================================================== */
.menu-offer-section {
    display: flex;
    gap: 30px;
    justify-content: center;
    align-items: stretch;
    flex-wrap: wrap;
    margin: 40px auto;
    max-width: 1000px;
}

.offer-card {
    flex: 1;
    min-width: 300px;
    max-width: 350px;
    background: #ffffff;
    border-radius: 20px;
    padding: 30px;
    color: #2d3436;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: 0.3s;
    border: 1px solid #eee;
}

.offer-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.offer-card.premium-card {
    border: 3px solid #f1c40f;
    transform: scale(1.05);
}

.price {
    font-weight: 800;
    font-size: 1.2rem;
    color: #2c3e50;
    margin: 15px 0;
}

/* ===================================================
   7. HERO СЕКЦІЯ (ГОЛОВНА)
   =================================================== */
.hero-home {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 70vh;
    padding: 40px 20px;
}

.hero-glass-card {
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 30px;
    padding: 30px 40px;
    max-width: 1100px;
    width: 95%;
    margin: 20px auto;
    text-align: center;
}

.hero-glass-card h1 {
    font-size: 2rem;
    color: #f1c40f;
}

.hero-subtitle {
    display: inline-block;
    text-align: left;
    margin-bottom: 20px;
    font-size: 1rem;
    color: #ffffff;
}

.hero-stats {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: rgba(255, 255, 255, 0.1);
    padding: 10px 15px;
    border-radius: 20px;
    min-width: 140px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-card strong {
    font-size: 18px;
    color: #f1c40f;
}

/* ===================================================
   8. ВІДГУКИ ТА ФОРМИ (СКЛО)
   =================================================== */
.glass-review {
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 30px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    color: white;
    margin-top: 40px;
}

.glass-review input,
.glass-review textarea,
.glass-review select,
.glass-input {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    padding: 12px;
    color: white;
    width: 100%;
    outline: none;
}

/* ===================================================
   9. КОЛЬОРОВІ БЛОКИ (ДІАБЕТ)
   =================================================== */
.box-ok {
    border: 2px solid #27ae60;
    color: #27ae60;
    background: rgba(39, 174, 96, 0.05);
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 15px;
    font-weight: 600;
}

.box-warn {
    border: 2px solid #f39c12;
    color: #d35400;
    background: rgba(243, 156, 18, 0.05);
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 15px;
    font-weight: 600;
}

.box-bad,
.box-forbidden {
    border: 2px solid #e74c3c;
    color: #e74c3c;
    background: rgba(231, 76, 60, 0.05);
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 15px;
    font-weight: 600;
}

/* ===================================================
   10. КНОПКИ ТА ФУТЕР
   =================================================== */
.main-btn,
.buy-btn,
.cta-scroll {
    background: linear-gradient(135deg, #f1c40f 0%, #f39c12 100%);
    color: #000;
    font-weight: 800;
    text-transform: uppercase;
    border: none;
    border-radius: 50px;
    padding: 15px 30px;
    cursor: pointer;
    transition: 0.3s;
    text-decoration: none;
}

footer {
    text-align: center;
    padding: 40px 20px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    color: white;
    margin-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

footer a {
    color: #f1c40f;
    margin: 0 15px;
    font-size: 24px;
    text-decoration: none;
    display: inline-block;
}

/* ===================================================
   11. АДАПТИВНІСТЬ
   =================================================== */

/* --- ДЛЯ ПК (понад 950px) --- */
@media (min-width: 951px) {
    .menu-btn {
        display: none;
    }

    .desktop-nav {
        display: flex;
        flex-direction: row;
        position: static;
        background: transparent;
        width: auto;
        height: auto;
    }
}

/* --- ДЛЯ МОБІЛЬНИХ (до 950px) --- */
@media (max-width: 950px) {
    .menu-btn {
        display: block;
        font-size: 24px;
        color: #ffffff;
        cursor: pointer;
        z-index: 1001;
    }

    .desktop-nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 280px;
        height: calc(100vh - 70px);
        background: rgba(20, 50, 50, 0.98);
        flex-direction: column;
        padding-top: 20px;
        z-index: 999;
        backdrop-filter: blur(10px);
        overflow-y: auto;
        transition: left 0.4s ease;
        display: flex;
    }

    .desktop-nav.active {
        left: 0;
    }

    .desktop-nav a {
        width: 100%;
        text-align: left;
        padding: 15px 25px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .dropdown-menu {
        position: static;
        background: rgba(255, 255, 255, 0.05);
        box-shadow: none;
        width: 100%;
        padding: 0;
    }

    .dropdown-menu a {
        color: #f1c40f;
        padding-left: 50px;
        font-size: 13px;
    }
}

/* --- ДЛЯ ПЛАНШЕТІВ ТА МЕНШИХ ЕКРАНІВ (до 768px) --- */
@media (max-width: 768px) {
    .header-container {
        padding: 10px 15px;
    }

    .desktop-nav {
        width: 80%;           /* Зручніше на маленьких екранах */
        max-width: 320px;
    }

    .content-area,
    .how-it-works,
    .faq-section,
    .benefits-dark {
        padding: 20px 15px;
        margin: 20px auto;
    }

    .hero-glass-card h1 {
        font-size: 1.8rem;
    }

    .offer-card {
        min-width: 100%;
    }

    .slider-group {
        max-width: 100%;
    }

    .hero-stats {
        flex-direction: column;
        gap: 10px;
    }

    .stat-card {
        min-width: 100%;
    }
}