/* ==========================================================================
   DESIGN SYSTEM & VARIABLES — KOZAKBUD
   ========================================================================== */

:root {
    /* Color Palette */
    --color-primary: #6A022B;          /* Deep Dark Burgundy */
    --color-primary-light: #8E0C3A;    /* Elegant Berry */
    --color-accent: #C91E6B;           /* Vibrant Fuchsia / Pink Accent */
    --color-accent-hover: #A51453;     /* Darker Fuchsia */
    --color-dark-plum: #1E0411;        /* Cozy Dark Plum */
    --color-bg-dark: #15020A;          /* Deepest Black-Plum Backdrop */
    --color-light-bg: #FCFAF9;         /* Warm Off-White */
    --color-light-gray: #FAF5F7;       /* Soft Gray-Rose */
    --color-amber: #E2A855;            /* Rating Stars / Golden Accent */
    --color-white: #FFFFFF;
    
    /* Text Colors */
    --color-text-dark: #2D1A22;        /* Deep Charcoal with Berry undertones */
    --color-text-muted: #6B555E;      /* Muted Warm Gray */
    --color-text-light: #F0E6EA;       /* Soft Light Pink-Gray */
    
    /* Typography */
    --font-heading: 'Playfair Display', Georgia, serif;
    --font-ui: 'Montserrat', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Shadows & Border Radius */
    --shadow-sm: 0 4px 10px rgba(21, 2, 10, 0.05);
    --shadow-md: 0 8px 30px rgba(21, 2, 10, 0.08);
    --shadow-lg: 0 15px 50px rgba(21, 2, 10, 0.15);
    --shadow-accent: 0 10px 30px rgba(201, 30, 107, 0.3);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   RESET & GLOBAL STYLES
   ========================================================================== */

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-text-dark);
    background-color: var(--color-light-bg);
    overflow-x: hidden;
}

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

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    border: none;
    outline: none;
}

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

/* ==========================================================================
   UTILITY CLASSES & GRID SYSTEM
   ========================================================================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 800px;
}

/* Grid helper */
.grid {
    display: grid;
    gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

/* Custom 12-column grid for complex layouts like the calculator */
.grid-12 {
    grid-template-columns: repeat(12, 1fr);
}
.col-5 { grid-column: span 5; }
.col-7 { grid-column: span 7; }

/* Flex utilities */
.flex { display: flex; }
.flex-column { flex-direction: column; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.flex-grow { flex-grow: 1; }

.gap-1 { gap: 8px; }
.gap-1.5 { gap: 12px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.gap-4 { gap: 32px; }

/* Spacing and Margins */
.section-padding {
    padding: 100px 0;
}
.py-3 { padding-top: 24px; padding-bottom: 24px; }
.py-4 { padding-top: 48px; padding-bottom: 48px; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-2 { margin-bottom: 16px; }
.margin-auto { margin-left: auto; margin-right: auto; }
.max-width-md { max-width: 480px; }
.max-width-lg { max-width: 640px; }

/* Styling elements */
.text-center { text-align: center; }
.text-white { color: var(--color-white); }
.text-dark { color: var(--color-text-dark); }
.text-amber { color: var(--color-amber); }
.opacity-60 { opacity: 0.6; }
.opacity-70 { opacity: 0.7; }
.opacity-80 { opacity: 0.8; }
.font-bold { font-weight: 700; }
.bg-light { background-color: var(--color-light-bg); }
.bg-light-gray { background-color: var(--color-light-gray); }
.bg-dark { background-color: var(--color-bg-dark); }
.border-bottom-dark { border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
.relative { position: relative; }
.z-10 { z-index: 10; }

/* ==========================================================================
   BUTTONS & BADGES
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn-lg {
    padding: 18px 36px;
    font-size: 1.05rem;
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-accent);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(8px);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-primary-light);
    border: 2px solid var(--color-primary-light);
}

.btn-outline:hover {
    background-color: var(--color-primary-light);
    color: var(--color-white);
    transform: translateY(-2px);
}

.btn-accent {
    background-color: var(--color-amber);
    color: var(--color-bg-dark);
    box-shadow: 0 4px 15px rgba(226, 168, 85, 0.3);
}

.btn-accent:hover {
    background-color: #f1b765;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(226, 168, 85, 0.5);
}

/* Arrow inside buttons */
.btn-arrow {
    width: 20px;
    height: 20px;
    margin-left: 10px;
    transition: var(--transition-fast);
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* Glow Effect */
.glow-effect::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transform: rotate(45deg);
    transition: var(--transition-slow);
    opacity: 0;
}

.glow-effect:hover::after {
    left: 120%;
    transition: 0.8s ease-in-out;
    opacity: 1;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-family: var(--font-ui);
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 20px;
}

.badge-primary {
    background-color: rgba(201, 30, 107, 0.15);
    color: var(--color-accent);
}

.badge-accent {
    background-color: rgba(226, 168, 85, 0.15);
    color: var(--color-amber);
}

/* ==========================================================================
   CARDS & NEUMORPHISM / GLASSMORPHISM
   ========================================================================== */

.card {
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    padding: 32px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

/* Glassmorphism styling */
.glass-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(20px) saturate(120%);
    -webkit-backdrop-filter: blur(20px) saturate(120%);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.dark-card {
    background: radial-gradient(circle at top left, var(--color-dark-plum), var(--color-bg-dark));
    color: var(--color-text-light);
    border: 1px solid rgba(201, 30, 107, 0.15);
    box-shadow: var(--shadow-lg);
}

/* ==========================================================================
   HEADER SECTION
   ========================================================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: rgba(21, 2, 10, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding: 16px 0;
    transition: var(--transition-normal);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 40px;
    height: 40px;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-family: var(--font-ui);
    font-weight: 800;
    font-size: 1.3rem;
    letter-spacing: 2px;
    color: var(--color-white);
    line-height: 1.1;
}

.logo-subtitle {
    font-family: var(--font-ui);
    font-weight: 600;
    font-size: 0.65rem;
    letter-spacing: 3px;
    color: var(--color-accent);
    line-height: 1.1;
    margin-top: 2px;
}

/* Nav Menu */
.nav-list {
    display: flex;
    list-style: none;
    gap: 28px;
}

.nav-link {
    font-family: var(--font-ui);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-text-light);
    letter-spacing: 0.5px;
    position: relative;
    padding: 6px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-white);
}

.nav-link:hover::after {
    width: 100%;
}

/* Header contacts */
.header-contacts {
    display: flex;
    align-items: center;
    gap: 20px;
}

.phone-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-white);
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.9rem;
}

.phone-link:hover {
    color: var(--color-accent);
}

.phone-icon {
    width: 18px;
    height: 18px;
    animation: pulse-phone 2s infinite;
}

@keyframes pulse-phone {
    0% { transform: scale(1); }
    50% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

/* Burger Button */
.burger-menu {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 26px;
    height: 18px;
    background: transparent;
    cursor: pointer;
}

.burger-line {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-white);
    border-radius: 2px;
    transition: var(--transition-fast);
}

/* Mobile overlay menu */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-bg-dark);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 40px;
    width: 100%;
    padding: 40px;
    position: relative;
}

.mobile-menu-close {
    position: absolute;
    top: 30px;
    right: 30px;
    background: transparent;
    font-size: 3rem;
    color: var(--color-white);
    cursor: pointer;
}

.mobile-nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.mobile-nav-link {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--color-white);
}

.mobile-menu-contacts {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.mobile-phone-link {
    font-family: var(--font-ui);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-accent);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */

.hero-section {
    padding: 180px 0 100px;
    background: radial-gradient(circle at 10% 20%, var(--color-dark-plum) 0%, var(--color-bg-dark) 90%);
    color: var(--color-white);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(201, 30, 107, 0.12) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    z-index: 1;
    pointer-events: none;
}

.hero-section::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(142, 12, 58, 0.15) 0%, transparent 60%);
    bottom: -100px;
    left: -100px;
    z-index: 1;
    pointer-events: none;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.8rem;
    line-height: 1.15;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 24px;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--color-text-light);
    margin-bottom: 40px;
    max-width: 520px;
}

.hero-cta-wrapper {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.hero-trust-badges {
    display: flex;
    gap: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 32px;
    max-width: 500px;
}

.trust-badge {
    display: flex;
    flex-direction: column;
}

.badge-num {
    font-family: var(--font-ui);
    font-weight: 800;
    font-size: 1.8rem;
    color: var(--color-accent);
    line-height: 1.1;
}

.badge-lbl {
    font-size: 0.8rem;
    color: var(--color-text-light);
    opacity: 0.8;
    margin-top: 4px;
}

/* Hero visual image container */
.hero-image-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: visible;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
    z-index: 5;
}

.hero-image {
    border-radius: var(--radius-lg);
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.glass-tag {
    position: absolute;
    backdrop-filter: blur(12px) saturate(120%);
    -webkit-backdrop-filter: blur(12px) saturate(120%);
    background: rgba(21, 2, 10, 0.65);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: 14px 20px;
    z-index: 10;
    box-shadow: var(--shadow-lg);
}

.hero-tag-top {
    top: 24px;
    left: -32px;
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 320px;
}

.tag-icon {
    font-size: 1.4rem;
}

.tag-text {
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.8rem;
    color: var(--color-white);
}

.hero-tag-bottom {
    bottom: -24px;
    right: 24px;
    text-align: center;
}

.stars {
    color: var(--color-amber);
    letter-spacing: 3px;
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.tag-sub {
    font-family: var(--font-ui);
    font-weight: 500;
    font-size: 0.75rem;
    color: var(--color-text-light);
}

/* Wave shape separator */
.wave-shape {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    line-height: 0;
    z-index: 10;
}

.wave-shape svg {
    width: 100%;
    height: 60px;
}

/* ==========================================================================
   DYNAMIC CALCULATOR SECTION
   ========================================================================== */

.section-header {
    margin-bottom: 60px;
}

.sub-heading {
    font-family: var(--font-ui);
    font-weight: 800;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-accent);
    display: block;
    margin-bottom: 12px;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.6rem;
    font-weight: 600;
    line-height: 1.25;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Configurator Layout */
.form-group-custom {
    display: flex;
    flex-direction: column;
}

.group-title {
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--color-text-dark);
}

/* Window shape selections */
.options-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.option-card {
    background: rgba(255, 255, 255, 0.6);
    border: 2px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-md);
    padding: 16px 8px;
    text-align: center;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.option-card input[type="radio"] {
    display: none;
}

.option-visual {
    width: 60px;
    height: 60px;
    color: var(--color-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.w-icon {
    width: 100%;
    height: 100%;
}

.option-name {
    font-family: var(--font-ui);
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.option-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: var(--color-white);
    border-color: rgba(201, 30, 107, 0.3);
}

.option-card.active {
    background: var(--color-white);
    border-color: var(--color-accent);
    box-shadow: 0 8px 20px rgba(201, 30, 107, 0.12);
}

.option-card.active .option-visual {
    color: var(--color-accent);
}

.option-card.active .option-name {
    color: var(--color-primary-light);
    font-weight: 700;
}

/* Button selections (row) */
.options-row {
    display: flex;
    gap: 12px;
}

.option-btn {
    flex: 1;
    background: rgba(255, 255, 255, 0.6);
    border: 2px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-md);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.option-btn input[type="radio"] {
    display: none;
}

.btn-inner {
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.btn-name {
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--color-primary-light);
}

.btn-desc {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.option-btn:hover {
    transform: translateY(-2px);
    background: var(--color-white);
    border-color: rgba(201, 30, 107, 0.3);
}

.option-btn.active {
    background: var(--color-white);
    border-color: var(--color-accent);
    box-shadow: 0 8px 20px rgba(201, 30, 107, 0.12);
}

.option-btn.active .btn-name {
    color: var(--color-accent);
}

/* Checkbox options grid */
.options-checkbox-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.checkbox-card {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.6);
    border: 2px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-md);
    padding: 16px;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    position: relative;
    user-select: none;
}

.checkbox-card input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkbox-custom {
    width: 22px;
    height: 22px;
    border: 2px solid var(--color-text-muted);
    border-radius: 6px;
    margin-right: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition-fast);
}

.checkbox-custom::after {
    content: '✓';
    color: var(--color-white);
    font-weight: 700;
    font-size: 0.8rem;
    opacity: 0;
    transform: scale(0);
    transition: var(--transition-fast);
}

.checkbox-label {
    font-size: 0.8rem;
    font-family: var(--font-ui);
    font-weight: 600;
    color: var(--color-text-dark);
}

.checkbox-card:hover {
    background: var(--color-white);
    border-color: rgba(201, 30, 107, 0.3);
}

.checkbox-card input[type="checkbox"]:checked ~ .checkbox-custom {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
}

.checkbox-card input[type="checkbox"]:checked ~ .checkbox-custom::after {
    opacity: 1;
    transform: scale(1);
}

.checkbox-card.active {
    background: var(--color-white);
    border-color: var(--color-accent);
    box-shadow: 0 8px 20px rgba(201, 30, 107, 0.12);
}

/* Calculator Result Block (Right) */
.calc-results {
    padding: 40px;
}

.result-title {
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 1.15rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 16px;
    margin-bottom: 24px;
}

/* Interactive Window Preview Display */
.window-preview-display {
    width: 100%;
    aspect-ratio: 1.4;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.p-window-frame {
    width: 140px;
    height: 140px;
    border: 10px solid #FFFFFF;
    background: linear-gradient(135deg, rgba(201, 30, 107, 0.1), rgba(255, 255, 255, 0.05));
    border-radius: 4px;
    box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.2), 0 10px 30px rgba(0,0,0,0.3);
    position: relative;
    display: flex;
    transition: var(--transition-normal);
}

/* Pane stylings for calculator changes */
.p-window-pane {
    flex: 1;
    height: 100%;
    border-left: 3px solid rgba(255, 255, 255, 0.8);
    border-right: 3px solid rgba(255, 255, 255, 0.8);
    position: relative;
}

.p-window-pane::before {
    content: '';
    position: absolute;
    top: 5px;
    left: 5px;
    width: 25px;
    height: 40px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.25) 0%, transparent 50%);
    transform: skewX(-20deg);
}

/* Pricing displays */
.price-display-wrapper {
    margin-bottom: 32px;
}

.old-price {
    font-family: var(--font-ui);
    font-size: 1.1rem;
    font-weight: 500;
    text-decoration: line-through;
    color: var(--color-text-muted);
    opacity: 0.7;
    margin-bottom: 4px;
}

.price-row {
    display: flex;
    align-items: baseline;
    gap: 12px;
}

.price-label {
    font-size: 0.95rem;
    opacity: 0.8;
}

.price-val {
    font-family: var(--font-ui);
    font-size: 2.3rem;
    font-weight: 800;
    color: var(--color-accent);
}

.discount-badge-calc {
    background-color: rgba(226, 168, 85, 0.15);
    color: var(--color-amber);
    font-family: var(--font-ui);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 12px;
    border-radius: 4px;
    display: inline-block;
    margin-top: 10px;
}

/* Form Styles */
.form-instruction {
    font-size: 0.85rem;
    color: var(--color-text-light);
    opacity: 0.95;
    margin-bottom: 16px;
}

.form-input {
    width: 100%;
    padding: 16px 20px;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 0.9rem;
    background-color: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--color-white);
    transition: var(--transition-fast);
}

.form-input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.form-input:focus {
    background-color: var(--color-white);
    color: var(--color-text-dark);
    border-color: var(--color-accent);
}

.privacy-note {
    font-size: 0.7rem;
    text-align: center;
    color: var(--color-text-light);
    opacity: 0.85;
    margin-top: 8px;
}

/* ==========================================================================
   QUIZ LEAD MAGNET SECTION
   ========================================================================== */

.quiz-section {
    overflow: hidden;
}

.quiz-bg-decoration {
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(201, 30, 107, 0.08) 0%, transparent 60%);
    bottom: -150px;
    right: -100px;
    z-index: 1;
    pointer-events: none;
}

.quiz-card {
    padding: 48px;
    position: relative;
    z-index: 5;
}

/* Quiz progress bar */
.quiz-progress-bar-wrap {
    background-color: rgba(255, 255, 255, 0.05);
    height: 8px;
    border-radius: var(--radius-full);
    margin-bottom: 40px;
    position: relative;
}

.quiz-progress {
    background: linear-gradient(90deg, var(--color-accent), var(--color-amber));
    height: 100%;
    border-radius: var(--radius-full);
    transition: var(--transition-normal);
}

.progress-text {
    position: absolute;
    right: 0;
    top: -24px;
    font-family: var(--font-ui);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-amber);
}

/* Steps container styling */
.quiz-steps-container {
    min-height: 280px;
}

.quiz-step {
    display: none;
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}

.quiz-step.active {
    display: block;
    opacity: 1;
    transform: translateX(0);
}

.quiz-step-q {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 32px;
}

/* Answers style grids */
.quiz-answers-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.quiz-answer-card {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.02);
    border: 2px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    padding: 24px;
    cursor: pointer;
    position: relative;
    user-select: none;
    transition: var(--transition-normal);
}

.quiz-answer-card input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.q-icon {
    font-size: 1.8rem;
    margin-right: 20px;
    flex-shrink: 0;
    transition: var(--transition-normal);
}

.q-label {
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.quiz-answer-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

.quiz-answer-card input[type="radio"]:checked ~ .q-icon {
    transform: scale(1.15);
}

.quiz-answer-card.active {
    background: rgba(201, 30, 107, 0.06);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-accent);
}

.quiz-answer-card.active .q-label {
    color: var(--color-white);
}

/* Quiz Gift Cards */
.gift-card {
    flex-direction: column;
    justify-content: center;
    padding: 32px 20px;
    text-align: center;
}

.gift-visual {
    font-size: 2.8rem;
    margin-bottom: 16px;
    transition: var(--transition-normal);
}

.gift-badge-status {
    position: absolute;
    top: 12px;
    right: 12px;
    background-color: var(--color-amber);
    color: var(--color-bg-dark);
    font-family: var(--font-ui);
    font-size: 0.6rem;
    font-weight: 800;
    text-transform: uppercase;
    padding: 4px 8px;
    border-radius: 4px;
}

.gift-card:hover .gift-visual {
    transform: translateY(-5px);
}

/* Final Quiz Capture */
.success-trophy {
    font-size: 4rem;
    margin-bottom: 24px;
    animation: bounce-trophy 2.5s infinite;
}

@keyframes bounce-trophy {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.quiz-final-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.quiz-final-desc {
    font-size: 1rem;
    color: var(--color-text-light);
    opacity: 0.85;
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.quiz-final-form {
    max-width: 450px;
}

.quiz-final-form .form-input {
    background-color: var(--color-white);
    color: var(--color-text-dark);
    border-color: rgba(0,0,0,0.1);
}

.quiz-final-form .form-input::placeholder {
    color: var(--color-text-muted);
}

/* ==========================================================================
   PRODUCT CATALOG SECTION
   ========================================================================== */

.catalog-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.tab-btn {
    background-color: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(0, 0, 0, 0.05);
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.tab-btn:hover {
    background-color: var(--color-white);
    color: var(--color-primary-light);
}

.tab-btn.active {
    background-color: var(--color-accent);
    color: var(--color-white);
    box-shadow: var(--shadow-accent);
}

/* Product Cards Grid */
.product-card {
    padding: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: relative;
    border: 1px solid rgba(0,0,0,0.02);
}

.product-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background-color: var(--color-primary-light);
    color: var(--color-white);
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.65rem;
    text-transform: uppercase;
    padding: 6px 12px;
    border-radius: 4px;
    z-index: 5;
}

.product-badge.badge-sale {
    background-color: var(--color-accent);
}

.product-badge.badge-premium {
    background-color: var(--color-amber);
    color: var(--color-bg-dark);
}

.product-icon-wrap {
    height: 180px;
    background: linear-gradient(135deg, rgba(201, 30, 107, 0.05) 0%, rgba(21, 2, 10, 0.05) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary-light);
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
    transition: var(--transition-normal);
}

.product-svg {
    width: 80px;
    height: 80px;
    transition: var(--transition-normal);
}

.product-card:hover .product-icon-wrap {
    color: var(--color-accent);
    background: linear-gradient(135deg, rgba(201, 30, 107, 0.1) 0%, rgba(21, 2, 10, 0.1) 100%);
}

.product-card:hover .product-svg {
    transform: scale(1.1);
}

.product-info {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.product-title {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.product-desc {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 20px;
    flex-grow: 1;
}

.product-specs {
    list-style: none;
    border-top: 1px dashed rgba(0, 0, 0, 0.08);
    border-bottom: 1px dashed rgba(0, 0, 0, 0.08);
    padding: 16px 0;
    margin-bottom: 24px;
}

.product-specs li {
    font-size: 0.8rem;
    margin-bottom: 6px;
    color: var(--color-text-dark);
}

.product-specs li:last-child {
    margin-bottom: 0;
}

.product-price-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.prod-price-col {
    display: flex;
    flex-direction: column;
}

.prod-price-col .old-price {
    font-size: 0.85rem;
    margin-bottom: 0;
}

.current-price {
    font-family: var(--font-ui);
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--color-accent);
}

/* ==========================================================================
   TECHNICAL SPECS SECTION (Hotspots)
   ========================================================================== */

.advantages-section {
    background-color: var(--color-bg-dark);
    padding: 120px 0;
}

/* Interactive 3D technical profile diagram */
.tech-profile-card {
    position: relative;
    border-radius: var(--radius-lg);
    background: radial-gradient(circle, var(--color-dark-plum), var(--color-bg-dark));
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow-lg);
    padding: 24px;
}

.tech-image {
    width: 100%;
    border-radius: var(--radius-md);
    opacity: 0.9;
}

/* Hotspots styling */
.tech-indicator {
    position: absolute;
    width: 32px;
    height: 32px;
    background-color: var(--color-accent);
    color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-ui);
    font-weight: 800;
    font-size: 0.85rem;
    cursor: pointer;
    box-shadow: 0 0 0 0 rgba(201, 30, 107, 0.5);
    animation: pulse-hotspot 2s infinite;
    z-index: 10;
}

@keyframes pulse-hotspot {
    0% { box-shadow: 0 0 0 0 rgba(201, 30, 107, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(201, 30, 107, 0); }
    100% { box-shadow: 0 0 0 0 rgba(201, 30, 107, 0); }
}

.ind-1 { top: 32%; left: 35%; }
.ind-2 { top: 58%; left: 38%; }
.ind-3 { top: 72%; left: 52%; }
.ind-4 { top: 22%; left: 68%; }

/* Tooltip definitions */
.tech-indicator::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 42px;
    left: 50%;
    transform: translateX(-50%) scale(0.85);
    background: rgba(21, 2, 10, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    width: 180px;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-lg);
    z-index: 15;
}

.tech-indicator:hover::after {
    opacity: 1;
    transform: translateX(-50%) scale(1);
}

.tech-indicator:hover {
    background-color: var(--color-amber);
    color: var(--color-bg-dark);
}

/* Advantage content list */
.adv-item {
    align-items: flex-start;
}

.adv-icon-wrap {
    font-size: 1.8rem;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.adv-item-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.adv-item-desc {
    font-size: 0.85rem;
    line-height: 1.5;
}

/* ==========================================================================
   PROCESS STEPS SECTION
   ========================================================================== */

.step-card {
    position: relative;
    border: 1px solid rgba(0,0,0,0.02);
    box-shadow: var(--shadow-sm);
}

.step-num {
    font-family: var(--font-ui);
    font-weight: 800;
    font-size: 2.8rem;
    color: rgba(201, 30, 107, 0.08);
    line-height: 1;
    margin-bottom: 16px;
    transition: var(--transition-normal);
}

.step-card:hover .step-num {
    color: rgba(201, 30, 107, 0.15);
    transform: translateY(-4px);
}

.step-title {
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 10px;
    color: var(--color-primary-light);
}

.step-desc {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.step-card::before {
    content: '';
    position: absolute;
    top: 50px;
    right: -24px;
    width: 24px;
    height: 2px;
    border-top: 2px dashed rgba(201, 30, 107, 0.2);
    z-index: 5;
}

.steps-grid .step-card:last-child::before {
    display: none;
}

/* ==========================================================================
   REVIEWS & TESTIMONIAL CAROUSEL
   ========================================================================== */

.reviews-carousel-wrapper {
    max-width: 680px;
    margin: 0 auto;
    position: relative;
}

.reviews-carousel {
    position: relative;
    overflow: hidden;
    min-height: 240px;
}

.review-slide {
    display: none;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.review-slide.active {
    display: block;
    opacity: 1;
}

.review-card {
    border: 1px solid rgba(0, 0, 0, 0.02);
}

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.95rem;
}

.user-name {
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.95rem;
    line-height: 1.2;
}

.user-status {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.review-content {
    margin-top: 20px;
    font-size: 0.95rem;
    font-style: italic;
    color: var(--color-text-dark);
}

/* Dots navigation */
.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 24px;
}

.dot {
    width: 10px;
    height: 10px;
    background-color: rgba(201, 30, 107, 0.2);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-fast);
}

.dot.active {
    background-color: var(--color-accent);
    width: 24px;
}

/* ==========================================================================
   FAQ SECTION (ACCORDIONS)
   ========================================================================== */

.faq-accordion-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background-color: var(--color-light-gray);
    border: 1px solid rgba(0, 0, 0, 0.03);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-normal);
}

.faq-question {
    padding: 24px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.faq-question h3 {
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--color-primary-light);
    padding-right: 16px;
}

.faq-arrow {
    font-size: 1.6rem;
    line-height: 1;
    color: var(--color-text-muted);
    transition: var(--transition-normal);
    transform: rotate(45deg); /* Plus symbol */
}

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

.faq-answer div {
    padding: 0 32px 28px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* Open styles */
.faq-item.active {
    background-color: var(--color-white);
    border-color: rgba(201, 30, 107, 0.15);
    box-shadow: var(--shadow-md);
}

.faq-item.active .faq-answer {
    max-height: 1000px;
    transition: max-height 0.5s cubic-bezier(1, 0, 1, 0);
}

.faq-item.active .faq-arrow {
    transform: rotate(90deg); /* Close symbol (rotated plus) */
    color: var(--color-accent);
}

/* ==========================================================================
   FOOTER SECTION
   ========================================================================== */

.footer-cta {
    background: radial-gradient(circle at center, var(--color-dark-plum) 0%, var(--color-bg-dark) 100%);
    overflow: hidden;
}

.footer-cta::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(201, 30, 107, 0.08) 0%, transparent 60%);
    top: -300px;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
}

/* Trust checks on CTA footer */
.cta-trust {
    font-size: 0.75rem;
    font-family: var(--font-ui);
    font-weight: 700;
}

.cta-trust span {
    color: var(--color-amber);
}

/* Footer details block */
.footer-info {
    padding-top: 80px;
    background-color: var(--color-bg-dark);
}

.footer-col {
    display: flex;
    flex-direction: column;
}

.footer-desc {
    font-size: 0.85rem;
    color: var(--color-text-light);
    opacity: 0.9;
    line-height: 1.6;
}

.social-links {
    margin-top: 16px;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-sm);
    color: var(--color-white);
}

.social-icon:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
    transform: translateY(-2px);
}

.footer-title {
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--color-white);
    margin-bottom: 24px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-link {
    font-size: 0.85rem;
    color: var(--color-text-light);
    opacity: 0.9;
    transition: var(--transition-fast);
}

.footer-link:hover {
    color: var(--color-amber);
    opacity: 1;
}

.footer-contacts-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-contacts-list li {
    font-size: 0.85rem;
    color: var(--color-text-light);
    opacity: 0.9;
}

.c-icon {
    font-size: 1.1rem;
}

.footer-bottom {
    font-size: 0.8rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--color-text-light);
}

.copyright {
    opacity: 0.9;
}

.footer-seo-links {
    opacity: 0.9;
}

/* ==========================================================================
   MODAL DIALOGS
   ========================================================================== */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(21, 2, 10, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-card {
    max-width: 480px;
    width: 100%;
    position: relative;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
    transform: scale(0.85);
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.35s ease-out;
}

.modal-overlay.active .modal-card {
    transform: scale(1);
    opacity: 1;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: transparent;
    font-size: 2rem;
    color: var(--color-text-muted);
    cursor: pointer;
    line-height: 1;
}

.modal-close:hover {
    color: var(--color-accent);
}

.modal-gift-icon {
    font-size: 3rem;
    margin-bottom: 12px;
    display: inline-block;
}

.modal-title {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--color-text-dark);
}

.modal-subtitle {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 8px;
}

.modal-card .form-input {
    background-color: var(--color-light-gray);
    color: var(--color-text-dark);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.modal-card .form-input::placeholder {
    color: var(--color-text-muted);
}

.modal-card .form-input:focus {
    background-color: var(--color-white);
    border-color: var(--color-accent);
}

/* Success Modal Details */
.success-icon-wrap {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-full);
    background-color: #E6FDF0;
    border: 2px solid #57D9A3;
    color: #1F8455;
    font-size: 2rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

/* ==========================================================================
   SCROLL ANIMATIONS (Intersection Observer classes)
   ========================================================================== */

.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.25, 1, 0.5, 1), transform 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES (Mobile First approach)
   ========================================================================== */

/* Up to 1024px: Tablets & Laptops */
@media (max-width: 1024px) {
    html { font-size: 15px; }
    
    .hero-title { font-size: 3rem; }
    .hero-desc { font-size: 1.05rem; }
    
    .calc-grid {
        grid-template-columns: 1fr;
    }
    .col-5, .col-7 {
        grid-column: span 12;
    }
    
    .options-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-section .container {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    
    .steps-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }
    .step-card::before {
        display: none;
    }
}

/* Up to 768px: Mobile / Medium Tablets */
@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .burger-menu {
        display: flex;
    }
    
    .header-contacts {
        display: none;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }
    
    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-cta-wrapper {
        justify-content: center;
    }
    
    .hero-trust-badges {
        margin-left: auto;
        margin-right: auto;
        justify-content: center;
    }
    
    .hero-tag-top {
        left: -10px;
        max-width: 280px;
    }
    
    .catalog-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .footer-lead-form {
        flex-direction: column;
    }
    
    .footer-lead-form .btn {
        width: 100%;
    }
}

/* Up to 480px: Narrow Mobile */
@media (max-width: 480px) {
    .hero-title { font-size: 2.4rem; }
    
    .options-checkbox-grid {
        grid-template-columns: 1fr;
    }
    
    .options-row {
        flex-direction: column;
    }
    
    .quiz-answers-grid {
        grid-template-columns: 1fr;
    }
    
    .quiz-card {
        padding: 24px;
    }
    
    .quiz-step-q {
        font-size: 1.4rem;
    }
    
    .tab-btn {
        width: 100%;
    }
}