/* =============================================
   Máy Massage Cổ Vai Gáy SiaaSoo — Landing Page
   Design System & Styles
   ============================================= */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
    /* Colors */
    --color-bg-dark: #1a1a2e;
    --color-bg-dark-2: #16213e;
    --color-bg-dark-3: #0f0f23;
    --color-bg-light: #f8f9fc;
    --color-bg-white: #ffffff;

    --color-accent: #ff6b35;
    --color-accent-hover: #e85a27;
    --color-accent-glow: rgba(255, 107, 53, 0.4);
    --color-yellow: #ffc107;

    --color-sale: #e63946;
    --color-sale-bg: #e63946;

    --color-text-dark: #2d2d3a;
    --color-text-body: #555566;
    --color-text-light: #8888a0;
    --color-text-white: #ffffff;
    --color-text-white-soft: rgba(255, 255, 255, 0.75);

    --color-brand: #55B9F3;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-light: #e4e4ec;
    --color-card-dark: rgba(255, 255, 255, 0.04);
    --color-card-light: #ffffff;

    --color-success: #22c55e;

    /* Typography */
    --font-primary: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Montserrat', 'Be Vietnam Pro', sans-serif;

    --fs-xs: 0.75rem;      /* 12px */
    --fs-sm: 0.875rem;     /* 14px */
    --fs-base: 1rem;       /* 16px */
    --fs-md: 1.125rem;     /* 18px */
    --fs-lg: 1.25rem;      /* 20px */
    --fs-xl: 1.5rem;       /* 24px */
    --fs-2xl: 1.75rem;     /* 28px */
    --fs-3xl: 2rem;        /* 32px */
    --fs-4xl: 2.5rem;      /* 40px */
    --fs-5xl: 3rem;        /* 48px */

    --fw-light: 300;
    --fw-regular: 400;
    --fw-medium: 500;
    --fw-semibold: 600;
    --fw-bold: 700;
    --fw-extrabold: 800;
    --fw-black: 900;

    --lh-tight: 1.2;
    --lh-normal: 1.6;
    --lh-relaxed: 1.8;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 5rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50%;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.16);
    --shadow-glow: 0 0 30px var(--color-accent-glow);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Z-index */
    --z-sticky: 100;
    --z-popup: 1000;

    /* Header */
    --header-height: 56px;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-primary);
    font-size: var(--fs-base);
    line-height: var(--lh-normal);
    color: var(--color-text-dark);
    background-color: var(--color-bg-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul, ol {
    list-style: none;
}

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

/* --- Utility: Section Title --- */
.section-title {
    font-family: var(--font-heading);
    font-size: var(--fs-2xl);
    font-weight: var(--fw-extrabold);
    color: var(--color-text-dark);
    text-align: center;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.02em;
}

.section-title--light {
    color: var(--color-text-white);
}

.section-desc {
    font-size: var(--fs-sm);
    color: var(--color-text-body);
    text-align: center;
    margin-bottom: var(--space-2xl);
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
    line-height: var(--lh-relaxed);
}

.section-desc--light {
    color: var(--color-text-white-soft);
}

.required {
    color: var(--color-sale);
}

/* --- Fade-in Animation --- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

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

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .fade-in {
        opacity: 1;
        transform: none;
    }

    html {
        scroll-behavior: auto;
    }
}

/* =============================================
   HEADER
   ============================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(26, 26, 46, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: var(--z-sticky);
    transition: box-shadow var(--transition-base);
}

.header.scrolled {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.header__container {
    max-width: 480px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-md);
}

.header__logo img {
    height: 100px;
    width: auto;
    object-fit: contain;
}

.header__hotline {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--color-accent);
    font-weight: var(--fw-semibold);
    font-size: var(--fs-sm);
    padding: var(--space-xs) var(--space-sm);
    border: 1.5px solid var(--color-accent);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast), color var(--transition-fast);
    min-height: 44px;
    min-width: 44px;
}

.header__hotline:hover,
.header__hotline:active {
    background: var(--color-accent);
    color: var(--color-text-white);
}

.header__hotline svg {
    flex-shrink: 0;
}

/* =============================================
   HERO BANNER
   ============================================= */
.hero {
    position: relative;
    background: linear-gradient(165deg, var(--color-bg-dark) 0%, var(--color-bg-dark-2) 50%, var(--color-bg-dark-3) 100%);
    padding: calc(var(--header-height) + var(--space-2xl)) var(--space-md) var(--space-3xl);
    overflow: hidden;
    text-align: center;
}

.hero__bg-glow {
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--color-accent-glow), transparent 70%);
    border-radius: var(--radius-full);
    filter: blur(60px);
    pointer-events: none;
    z-index: 0;
}

.hero__container {
    position: relative;
    z-index: 1;
    max-width: 480px;
    margin: 0 auto;
}

/* Badge giảm giá */
.hero__badge {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    background: var(--color-sale-bg);
    color: var(--color-text-white);
    border-radius: var(--radius-full);
    font-size: var(--fs-xs);
    font-weight: var(--fw-bold);
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    box-shadow: 0 4px 20px rgba(230, 57, 70, 0.4);
    animation: badgePulse 2s ease-in-out infinite;
}

.hero__badge strong {
    font-size: var(--fs-xl);
    font-weight: var(--fw-black);
}

@keyframes badgePulse {
    0%, 100% { transform: scale(1); box-shadow: 0 4px 20px rgba(230, 57, 70, 0.4); }
    50% { transform: scale(1.08); box-shadow: 0 6px 30px rgba(230, 57, 70, 0.6); }
}

/* Hero image */
.hero__image-wrapper {
    max-width: 280px;
    margin: 0 auto var(--space-xl);
    position: relative;
}

.hero__image {
    border-radius: var(--radius-lg);
    filter: drop-shadow(0 16px 40px rgba(0, 0, 0, 0.3));
}

/* Hero content */
.hero__tagline {
    font-size: var(--fs-sm);
    color: var(--color-accent);
    font-weight: var(--fw-medium);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: var(--space-sm);
}

.hero__title {
    font-family: var(--font-heading);
    font-size: var(--fs-2xl);
    font-weight: var(--fw-black);
    color: var(--color-text-white);
    line-height: var(--lh-tight);
    margin-bottom: var(--space-sm);
}

.hero__brand {
    color: var(--color-accent);
}

.hero__subtitle {
    font-size: var(--fs-sm);
    color: var(--color-text-white-soft);
    margin-bottom: var(--space-xl);
    line-height: var(--lh-relaxed);
}

/* Pricing */
.hero__pricing {
    margin-bottom: var(--space-xl);
    animation: priceHighlight 3s ease-in-out infinite;
}

@keyframes priceHighlight {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.03); }
}

.hero__price-original {
    font-size: var(--fs-sm);
    color: var(--color-text-light);
    margin-bottom: var(--space-xs);
}

.hero__price-original del {
    text-decoration: line-through;
    margin-left: var(--space-xs);
}

.hero__price-sale {
    font-family: var(--font-heading);
    font-size: var(--fs-4xl);
    font-weight: var(--fw-black);
    color: var(--color-sale);
    line-height: 1;
    text-shadow: 0 2px 20px rgba(230, 57, 70, 0.3);
}

.hero__price-sale sup {
    font-size: 0.5em;
    vertical-align: super;
}

/* CTA Button */
.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--color-accent) 0%, #ff8f5e 100%);
    color: var(--color-text-white);
    font-weight: var(--fw-bold);
    font-size: var(--fs-base);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    min-height: 52px;
    min-width: 44px;
    text-align: center;
    border: none;
    animation: ctaPulse 2.5s ease-in-out infinite;
    box-shadow: var(--shadow-glow);
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent 30%,
        rgba(255, 255, 255, 0.15) 50%,
        transparent 70%
    );
    transform: rotate(45deg) translateX(-100%);
    animation: ctaShine 4s ease-in-out infinite;
}

@keyframes ctaPulse {
    0%, 100% { box-shadow: 0 0 20px var(--color-accent-glow); }
    50% { box-shadow: 0 0 40px var(--color-accent-glow), 0 0 60px rgba(255, 107, 53, 0.2); }
}

@keyframes ctaShine {
    0%, 60% { transform: rotate(45deg) translateX(-100%); }
    100% { transform: rotate(45deg) translateX(100%); }
}

.cta-button:hover,
.cta-button:active {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 0 50px var(--color-accent-glow);
}

.cta-button--primary {
    width: 100%;
    max-width: 380px;
}

.cta-button--large {
    padding: 18px 36px;
    font-size: var(--fs-md);
    min-height: 56px;
}

.cta-button--full {
    width: 100%;
}

.cta-button svg {
    flex-shrink: 0;
}

/* Trust badges */
.hero__trust {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
    margin-top: var(--space-lg);
    font-size: var(--fs-sm);
    color: var(--color-text-white-soft);
}

/* =============================================
   PROBLEMS SECTION
   ============================================= */
.problems {
    background: linear-gradient(180deg, var(--color-bg-dark-3) 0%, var(--color-bg-dark) 100%);
    padding: var(--space-3xl) var(--space-md);
}

.problems__container {
    max-width: 480px;
    margin: 0 auto;
}

.problems__grid {
    margin-bottom: var(--space-2xl);
}

.problems__image {
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.problems__symptoms {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.problems__symptom {
    text-align: center;
    padding: var(--space-lg) var(--space-sm);
    background: var(--color-card-dark);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: transform var(--transition-base), border-color var(--transition-base);
}

.problems__symptom:hover {
    transform: translateY(-4px);
    border-color: var(--color-accent);
}

.problems__symptom-icon {
    font-size: var(--fs-3xl);
    margin-bottom: var(--space-sm);
}

.problems__symptom h3 {
    font-size: var(--fs-sm);
    font-weight: var(--fw-bold);
    color: var(--color-text-white);
    margin-bottom: var(--space-xs);
}

.problems__symptom p {
    font-size: var(--fs-xs);
    color: var(--color-text-white-soft);
    line-height: var(--lh-normal);
}

/* =============================================
   INTRO SECTION
   ============================================= */
.intro {
    background: var(--color-bg-light);
    padding: var(--space-3xl) var(--space-md);
}

.intro__container {
    max-width: 480px;
    margin: 0 auto;
}

.intro__showcase {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.intro__image-wrap {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.intro__image-wrap img {
    width: 100%;
    transition: transform var(--transition-slow);
}

.intro__image-wrap:hover img {
    transform: scale(1.03);
}

.intro__highlights {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.intro__highlight {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--color-card-light);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.intro__highlight:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.intro__highlight-icon {
    font-size: var(--fs-xl);
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.1), rgba(255, 143, 94, 0.1));
    border-radius: var(--radius-sm);
}

.intro__highlight h3 {
    font-size: var(--fs-base);
    font-weight: var(--fw-bold);
    color: var(--color-text-dark);
    margin-bottom: var(--space-xs);
}

.intro__highlight p {
    font-size: var(--fs-sm);
    color: var(--color-text-body);
    line-height: var(--lh-normal);
}

/* =============================================
   FEATURES SECTION
   ============================================= */
.features {
    background: linear-gradient(180deg, var(--color-bg-dark) 0%, var(--color-bg-dark-2) 100%);
    padding: var(--space-3xl) var(--space-md);
}

.features__container {
    max-width: 480px;
    margin: 0 auto;
}

/* Feature Card */
.feature-card {
    margin-bottom: var(--space-2xl);
    background: var(--color-card-dark);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--transition-base);
}

.feature-card:hover {
    border-color: rgba(255, 107, 53, 0.3);
}

.feature-card:last-child {
    margin-bottom: 0;
}

.feature-card__image {
    width: 100%;
    overflow: hidden;
}

.feature-card__image img {
    width: 100%;
    transition: transform var(--transition-slow);
}

.feature-card:hover .feature-card__image img {
    transform: scale(1.04);
}

.feature-card__content {
    padding: var(--space-xl);
}

.feature-card__title {
    font-family: var(--font-heading);
    font-size: var(--fs-lg);
    font-weight: var(--fw-bold);
    color: var(--color-text-white);
    margin-bottom: var(--space-sm);
}

.feature-card__desc {
    font-size: var(--fs-sm);
    color: var(--color-text-white-soft);
    line-height: var(--lh-relaxed);
}

/* Mode indicators */
.feature-card__modes {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.feature-card__mode {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-accent);
}

.mode-label {
    font-weight: var(--fw-bold);
    color: var(--color-accent);
    font-size: var(--fs-sm);
    min-width: 60px;
}

.mode-value {
    color: var(--color-text-white-soft);
    font-size: var(--fs-sm);
}

/* =============================================
   SPECS SECTION
   ============================================= */
.specs {
    background: var(--color-bg-light);
    padding: var(--space-3xl) var(--space-md);
}

.specs__container {
    max-width: 480px;
    margin: 0 auto;
}

.specs__table-wrapper {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.specs__table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-card-light);
}

.specs__table tr {
    border-bottom: 1px solid var(--color-border-light);
    transition: background var(--transition-fast);
}

.specs__table tr:last-child {
    border-bottom: none;
}

.specs__table tr:hover {
    background: rgba(255, 107, 53, 0.04);
}

.specs__label {
    padding: 14px 16px;
    font-weight: var(--fw-semibold);
    color: var(--color-text-dark);
    font-size: var(--fs-sm);
    white-space: nowrap;
    width: 40%;
    background: rgba(85, 185, 243, 0.04);
    border-right: 2px solid var(--color-brand);
}

.specs__value {
    padding: 14px 16px;
    font-size: var(--fs-sm);
    color: var(--color-text-body);
}

/* =============================================
   GALLERY SECTION
   ============================================= */
.gallery {
    background: linear-gradient(180deg, var(--color-bg-dark-2) 0%, var(--color-bg-dark) 100%);
    padding: var(--space-3xl) var(--space-md);
}

.gallery__container {
    max-width: 480px;
    margin: 0 auto;
}

.gallery__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.gallery__item {
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 1;
    cursor: pointer;
    position: relative;
}

.gallery__item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.gallery__item:hover img {
    transform: scale(1.08);
}

.gallery__item::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.2) 0%, transparent 50%);
    pointer-events: none;
}

/* =============================================
   REVIEWS SECTION
   ============================================= */
.reviews {
    background: var(--color-bg-light);
    padding: var(--space-3xl) var(--space-md);
}

.reviews__container {
    max-width: 480px;
    margin: 0 auto;
}

.reviews__grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.review-card {
    background: var(--color-card-light);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-light);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.review-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.review-card__header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.review-card__avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-brand), var(--color-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-white);
    font-weight: var(--fw-bold);
    font-size: var(--fs-sm);
    flex-shrink: 0;
}

.review-card__name {
    font-size: var(--fs-base);
    font-weight: var(--fw-semibold);
    color: var(--color-text-dark);
}

.review-card__stars {
    font-size: var(--fs-sm);
    letter-spacing: 2px;
}

.review-card__text {
    font-size: var(--fs-sm);
    color: var(--color-text-body);
    line-height: var(--lh-relaxed);
    font-style: italic;
    margin-bottom: var(--space-md);
}

.review-card__date {
    font-size: var(--fs-xs);
    color: var(--color-text-light);
}

/* =============================================
   CTA MID SECTION
   ============================================= */
.cta-mid {
    background: linear-gradient(135deg, var(--color-bg-dark) 0%, #1e2a4a 50%, var(--color-bg-dark-2) 100%);
    padding: var(--space-3xl) var(--space-md);
    position: relative;
    overflow: hidden;
}

.cta-mid::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.15) 0%, transparent 70%);
    pointer-events: none;
}

.cta-mid__container {
    max-width: 480px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta-mid__title {
    font-family: var(--font-heading);
    font-size: var(--fs-xl);
    font-weight: var(--fw-extrabold);
    color: var(--color-text-white);
    margin-bottom: var(--space-xl);
}

.cta-mid__pricing {
    margin-bottom: var(--space-md);
}

.cta-mid__old-price {
    font-size: var(--fs-md);
    color: var(--color-text-light);
    text-decoration: line-through;
    display: block;
    margin-bottom: var(--space-xs);
}

.cta-mid__new-price {
    font-family: var(--font-heading);
    font-size: var(--fs-5xl);
    font-weight: var(--fw-black);
    color: var(--color-sale);
    line-height: 1;
    animation: priceBounce 3s ease-in-out infinite;
}

@keyframes priceBounce {
    0%, 100% { transform: scale(1); }
    30% { transform: scale(1.05); }
    60% { transform: scale(1); }
}

.cta-mid__new-price sup {
    font-size: 0.4em;
    vertical-align: super;
}

.cta-mid__savings {
    font-size: var(--fs-sm);
    color: var(--color-success);
    margin-bottom: var(--space-xl);
}

.cta-mid__savings strong {
    font-weight: var(--fw-extrabold);
}

.cta-mid__note {
    font-size: var(--fs-xs);
    color: var(--color-text-white-soft);
    margin-top: var(--space-lg);
}

/* =============================================
   ORDER SECTION
   ============================================= */
.order {
    background: var(--color-bg-white);
    padding: var(--space-3xl) var(--space-md) var(--space-4xl);
}

.order__container {
    max-width: 480px;
    margin: 0 auto;
}

.order__wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

/* Order Summary */
.order__product {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    padding: var(--space-lg);
    background: var(--color-bg-light);
    border-radius: var(--radius-md);
}

.order__product-image {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.order__product-info h3 {
    font-size: var(--fs-sm);
    font-weight: var(--fw-bold);
    color: var(--color-text-dark);
    margin-bottom: var(--space-xs);
    line-height: var(--lh-tight);
}

.order__product-pricing {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xs);
}

.order__product-pricing del {
    font-size: var(--fs-sm);
    color: var(--color-text-light);
}

.order__product-sale-price {
    font-size: var(--fs-lg);
    font-weight: var(--fw-extrabold);
    color: var(--color-sale);
}

.order__product-badge {
    font-size: var(--fs-xs);
    color: var(--color-success);
    font-weight: var(--fw-medium);
}

/* Benefits */
.order__benefits {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.order__benefit {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--fs-sm);
    color: var(--color-text-body);
}

.order__benefit-icon {
    flex-shrink: 0;
    font-size: var(--fs-md);
}

/* Order Form */
.order__form {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.order__form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.order__label {
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    color: var(--color-text-dark);
}

.order__input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-md);
    font-size: var(--fs-base);
    color: var(--color-text-dark);
    background: var(--color-bg-white);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    min-height: 48px;
}

.order__input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.15);
}

.order__input::placeholder {
    color: var(--color-text-light);
    font-size: var(--fs-sm);
}

.order__input.error {
    border-color: var(--color-sale);
    box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.12);
}

.order__textarea {
    resize: vertical;
    min-height: 80px;
}

.order__form-note {
    text-align: center;
    font-size: var(--fs-xs);
    color: var(--color-text-light);
    margin-top: calc(-1 * var(--space-sm));
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
    background: var(--color-bg-dark-3);
    padding: var(--space-2xl) var(--space-md);
    text-align: center;
}

.footer__container {
    max-width: 480px;
    margin: 0 auto;
}

.footer__logo {
    height: 126px;
    width: auto;
    margin: 0 auto var(--space-md);
    opacity: 0.9;
}

.footer__address {
    font-size: var(--fs-sm);
    color: var(--color-text-white-soft);
    margin-bottom: var(--space-sm);
    line-height: var(--lh-relaxed);
}

.footer__phone {
    display: inline-block;
    font-size: var(--fs-base);
    font-weight: var(--fw-semibold);
    color: var(--color-accent);
    margin-bottom: var(--space-lg);
    min-height: 44px;
    line-height: 44px;
}

.footer__phone:hover {
    text-decoration: underline;
}

.footer__divider {
    height: 1px;
    background: var(--color-border);
    margin-bottom: var(--space-lg);
}

.footer__copyright {
    font-size: var(--fs-xs);
    color: var(--color-text-light);
}

/* =============================================
   STICKY CTA (Mobile)
   ============================================= */
.sticky-cta {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    padding: var(--space-sm) var(--space-md);
    background: rgba(15, 15, 35, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid var(--color-border);
    transform: translateY(100%);
    transition: transform var(--transition-base);
}

.sticky-cta.visible {
    transform: translateY(0);
}

.cta-button--sticky {
    width: 100%;
    padding: 14px;
    font-size: var(--fs-sm);
    font-weight: var(--fw-bold);
}

/* =============================================
   ORDER SUCCESS POPUP
   ============================================= */
.order-success-popup {
    position: fixed;
    inset: 0;
    z-index: var(--z-popup);
    background: rgba(0, 0, 0, 0.6);
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.order-success-popup.active {
    display: flex;
}

.order-success-popup__content {
    background: var(--color-bg-white);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl) var(--space-xl);
    text-align: center;
    max-width: 380px;
    width: 100%;
    box-shadow: var(--shadow-lg);
    animation: popupSlideIn 0.4s ease-out;
}

@keyframes popupSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.order-success-popup__icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

.order-success-popup__content h3 {
    font-family: var(--font-heading);
    font-size: var(--fs-xl);
    font-weight: var(--fw-bold);
    color: var(--color-success);
    margin-bottom: var(--space-sm);
}

.order-success-popup__content p {
    font-size: var(--fs-sm);
    color: var(--color-text-body);
    margin-bottom: var(--space-xl);
    line-height: var(--lh-relaxed);
}

.order-success-popup__content .cta-button {
    animation: none;
}

/* =============================================
   RESPONSIVE — Tablet (768px+)
   ============================================= */
@media (min-width: 768px) {
    :root {
        --header-height: 64px;
    }

    .header__container,
    .hero__container,
    .problems__container,
    .intro__container,
    .features__container,
    .specs__container,
    .gallery__container,
    .reviews__container,
    .cta-mid__container,
    .order__container,
    .footer__container {
        max-width: 720px;
    }

    .section-title {
        font-size: var(--fs-3xl);
    }

    .section-desc {
        font-size: var(--fs-base);
    }

    .hero__title {
        font-size: var(--fs-3xl);
    }

    .hero__image-wrapper {
        max-width: 340px;
    }

    .problems__symptoms {
        gap: var(--space-lg);
    }

    .problems__symptom h3 {
        font-size: var(--fs-base);
    }

    .problems__symptom p {
        font-size: var(--fs-sm);
    }

    .intro__showcase {
        flex-direction: row;
        align-items: stretch;
    }

    .intro__image-wrap {
        flex: 1;
        min-width: 0;
    }

    .intro__image-wrap img {
        height: 100%;
        object-fit: cover;
    }

    .intro__highlights {
        flex: 1;
    }

    .feature-card {
        display: flex;
        align-items: stretch;
    }

    .feature-card__image {
        width: 45%;
        flex-shrink: 0;
    }

    .feature-card__image img {
        height: 100%;
        object-fit: cover;
    }

    .feature-card__content {
        flex: 1;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }

    .feature-card--reverse {
        flex-direction: row-reverse;
    }

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

    .reviews__grid {
        flex-direction: row;
        gap: var(--space-lg);
    }

    .review-card {
        flex: 1;
    }

    .order__wrapper {
        flex-direction: row;
    }

    .order__summary {
        flex: 1;
    }

    .order__form {
        flex: 1;
    }

    .sticky-cta {
        display: none;
    }

    .cta-mid__new-price {
        font-size: 4rem;
    }
}

/* =============================================
   RESPONSIVE — Desktop (1024px+)
   ============================================= */
@media (min-width: 1024px) {
    .header__container,
    .hero__container,
    .problems__container,
    .intro__container,
    .features__container,
    .specs__container,
    .gallery__container,
    .reviews__container,
    .cta-mid__container,
    .order__container,
    .footer__container {
        max-width: 1000px;
    }

    .section-title {
        font-size: var(--fs-4xl);
    }

    .hero {
        padding-top: calc(var(--header-height) + var(--space-4xl));
        padding-bottom: var(--space-4xl);
    }

    .hero__container {
        display: grid;
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
        gap: var(--space-xl);
        text-align: left;
        align-items: center;
    }

    .hero__badge {
        grid-column: 2;
        grid-row: 1;
        justify-self: end;
        margin-bottom: 0;
    }

    .hero__image-wrapper {
        grid-column: 2;
        grid-row: 1 / 3;
        max-width: 400px;
        margin: 0;
        justify-self: center;
    }

    .hero__content {
        grid-column: 1;
        grid-row: 1 / 3;
    }

    .hero__title {
        font-size: var(--fs-4xl);
    }

    .hero__trust {
        justify-content: flex-start;
    }

    .cta-button--primary {
        width: auto;
    }

    .feature-card__title {
        font-size: var(--fs-xl);
    }

    .feature-card__desc {
        font-size: var(--fs-base);
    }

    .intro__highlight p {
        font-size: var(--fs-base);
    }

    .hero__bg-glow {
        width: 500px;
        height: 500px;
        left: 60%;
    }

    .specs__label,
    .specs__value {
        padding: 16px 24px;
        font-size: var(--fs-base);
    }
}

/* Extra bottom padding to avoid sticky CTA overlap on mobile */
@media (max-width: 767px) {
    .footer {
        padding-bottom: calc(var(--space-2xl) + 70px);
    }
}