/* ========================================
   小熊贴贴 PandaTietie - 官网样式
   ======================================== */

/* --- CSS Variables --- */
:root {
    --color-primary: #5fb3b0;
    --color-primary-dark: #4a9491;
    --color-primary-light: #8fd4d1;
    --color-primary-bg: #e6f5f4;

    --color-accent: #ff9aa2;
    --color-accent-light: #ffe6e8;

    --color-warm: #fff0e1;
    --color-warm-bg: #fffaf5;

    --color-text: #2b2b2b;
    --color-text-secondary: #5e5e5e;
    --color-text-light: #9a9a9a;

    --color-bg: #ffffff;
    --color-bg-alt: #fffaf5;
    --color-border: #f0e8e0;

    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 28px;
    --radius-xl: 40px;

    --shadow-sm: 0 4px 12px rgba(95, 179, 176, 0.08);
    --shadow-md: 0 8px 28px rgba(95, 179, 176, 0.12);
    --shadow-lg: 0 20px 60px rgba(95, 179, 176, 0.18);
    --shadow-float: 0 24px 80px rgba(43, 43, 43, 0.14);

    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: #fff;
    padding: 8px 16px;
    z-index: 10000;
    font-weight: 600;
    border-radius: 0 0 var(--radius-sm) 0;
    transition: top 0.2s ease;
}

.skip-link:focus {
    top: 0;
    outline: 2px solid #fff;
    outline-offset: -2px;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

/* --- Container --- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    border: none;
    white-space: nowrap;
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    box-shadow: 0 6px 20px rgba(95, 179, 176, 0.4);
}

.btn--primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 28px rgba(95, 179, 176, 0.5);
}

.btn--outline {
    background: rgba(255, 255, 255, 0.7);
    color: var(--color-primary-dark);
    border: 2px solid var(--color-primary-light);
    backdrop-filter: blur(8px);
}

.btn--outline:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
    transform: translateY(-3px) scale(1.02);
}

/* --- Section Header --- */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header__tag {
    display: inline-block;
    padding: 8px 22px;
    background: var(--color-primary-bg);
    color: var(--color-primary-dark);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.05em;
    border: 1px solid rgba(95, 179, 176, 0.15);
}

.section-header__title {
    font-size: clamp(1.875rem, 4.5vw, 2.75rem);
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: 14px;
    letter-spacing: -0.03em;
}

.section-header__desc {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ========================================
   Header / Navigation
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.header--scrolled {
    background: rgba(255, 255, 255, 0.92);
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 1001;
    padding: 6px 10px;
    margin-left: -10px;
    border-radius: var(--radius-md);
    transition: background 0.3s ease;
}

.nav__logo:hover {
    background: rgba(95, 179, 176, 0.08);
}

.nav__logo-icon {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.nav__logo:hover .nav__logo-icon {
    transform: rotate(-6deg) scale(1.1);
}

.nav__logo-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    letter-spacing: -0.02em;
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: 36px;
}

.nav__link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color 0.3s ease;
    position: relative;
    padding: 6px 0;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    border-radius: 2px;
    transition: width 0.3s ease;
}

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

.nav__link:hover::after,
.nav__link--active::after {
    width: 100%;
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: rgba(95, 179, 176, 0.08);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    z-index: 1001;
    transition: background 0.3s ease;
}

.nav__toggle:hover {
    background: rgba(95, 179, 176, 0.15);
}

.nav__toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.nav__toggle--active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav__toggle--active span:nth-child(2) {
    opacity: 0;
}

.nav__toggle--active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 140px 0 100px;
    overflow: hidden;
    background: linear-gradient(160deg, var(--color-warm-bg) 0%, #fff 55%, var(--color-primary-bg) 100%);
}

.hero__bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.hero__circle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.18;
    filter: blur(40px);
}

.hero__circle--1 {
    width: 520px;
    height: 520px;
    background: var(--color-primary);
    top: -160px;
    right: -120px;
    animation: float 10s ease-in-out infinite;
}

.hero__circle--2 {
    width: 360px;
    height: 360px;
    background: var(--color-accent);
    bottom: -80px;
    left: -60px;
    animation: float 7s ease-in-out infinite reverse;
}

.hero__circle--3 {
    width: 280px;
    height: 280px;
    background: var(--color-primary-light);
    top: 40%;
    left: 55%;
    animation: float 12s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) translateX(0); }
    33% { transform: translateY(-24px) translateX(12px); }
    66% { transform: translateY(12px) translateX(-12px); }
}

.hero__content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero__text {
    max-width: 560px;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.8);
    color: var(--color-primary-dark);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 28px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(95, 179, 176, 0.15);
    box-shadow: var(--shadow-sm);
}

.hero__badge-logo {
    width: 22px;
    height: 22px;
    border-radius: 6px;
    vertical-align: middle;
}

.hero__title {
    font-size: clamp(2.5rem, 6vw, 3.75rem);
    font-weight: 900;
    line-height: 1.12;
    letter-spacing: -0.04em;
    margin-bottom: 24px;
    color: var(--color-text);
}

.hero__title--highlight {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.hero__desc {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.85;
    margin-bottom: 36px;
}

.hero__actions {
    display: flex;
    gap: 16px;
    margin-bottom: 52px;
    flex-wrap: wrap;
}

.hero__stats {
    display: flex;
    gap: 48px;
}

.hero__stat {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.hero__stat-num {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--color-primary-dark);
    letter-spacing: -0.03em;
}

.hero__stat-label {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

/* Hero Visual - Product Showcase */
.hero__visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero__showcase {
    position: relative;
    width: 100%;
    max-width: 480px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero__showcase-frame {
    position: relative;
    width: 100%;
    max-width: 360px;
    aspect-ratio: 9 / 16;
    border-radius: var(--radius-xl);
    background: linear-gradient(145deg, #fff 0%, var(--color-warm-bg) 100%);
    padding: 16px;
    box-shadow: var(--shadow-float);
    animation: showcaseFloat 6s ease-in-out infinite;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.hero__showcase-frame::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 20%, rgba(255, 154, 162, 0.15), transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(95, 179, 176, 0.12), transparent 50%);
    pointer-events: none;
    z-index: 0;
}

@keyframes showcaseFloat {
    0%, 100% { transform: translateY(0) rotate(-1deg); }
    50% { transform: translateY(-16px) rotate(1deg); }
}

.hero__showcase-img {
    position: relative;
    z-index: 1;
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: var(--radius-lg);
}

.hero__floating-card {
    position: absolute;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px;
    background: rgba(255, 255, 255, 0.92);
    border-radius: 50px;
    box-shadow: var(--shadow-md);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.7);
    z-index: 10;
    animation: cardFloat 5s ease-in-out infinite;
}

.hero__floating-icon {
    font-size: 1.3rem;
    line-height: 1;
}

.hero__floating-text {
    white-space: nowrap;
}

.hero__floating-card--1 {
    top: 10%;
    left: -10%;
    animation-delay: 0s;
}

.hero__floating-card--2 {
    top: 45%;
    right: -8%;
    animation-delay: 1.5s;
}

.hero__floating-card--3 {
    bottom: 12%;
    left: -4%;
    animation-delay: 3s;
}

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

.demo-map {
    position: relative;
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #d4e8d0, #c8dcc8);
    border-radius: 16px;
    overflow: hidden;
}

.demo-map__path {
    position: absolute;
    top: 50%;
    left: 20%;
    width: 60%;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
    opacity: 0.5;
    transform: rotate(-5deg);
}

.demo-map__pin {
    position: absolute;
    top: 45%;
    right: 20%;
    width: 16px;
    height: 16px;
    background: #e74c3c;
    border-radius: 50% 50% 50% 0;
    transform: rotate(-45deg);
    box-shadow: 0 2px 8px rgba(231, 76, 60, 0.4);
}

.demo-map__avatar {
    position: absolute;
    bottom: 20px;
    left: 20px;
    width: 44px;
    height: 44px;
    background: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-md);
}

.demo-info {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.demo-info__item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: #fff;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

.demo-info__icon {
    font-size: 1.1rem;
}

/* ========================================
   Features Section
   ======================================== */
.features {
    padding: 120px 0;
    background: var(--color-bg);
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    padding: 40px 30px;
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 0;
    background: linear-gradient(180deg, var(--color-primary-bg), transparent);
    transition: height 0.4s ease;
    z-index: 0;
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-card:hover::before {
    height: 100%;
}

.feature-card__icon {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 68px;
    height: 68px;
    border-radius: var(--radius-md);
    margin-bottom: 22px;
    color: #fff;
    transition: transform 0.4s ease;
}

.feature-card:hover .feature-card__icon {
    transform: scale(1.1) rotate(-4deg);
}

.feature-card__icon--map {
    background: linear-gradient(135deg, #5fb3b0, #4a9491);
}

.feature-card__icon--audio {
    background: linear-gradient(135deg, #ff9aa2, #f27a84);
}

.feature-card__icon--chat {
    background: linear-gradient(135deg, #ffc46b, #f5a623);
}

.feature-card__icon--footprint {
    background: linear-gradient(135deg, #8fd4d1, #5fb3b0);
}

.feature-card__icon--device {
    background: linear-gradient(135deg, #9db5e8, #7a9bd8);
}

.feature-card__icon--ai {
    background: linear-gradient(135deg, #c9a8e8, #a87dd8);
}

.feature-card__title {
    position: relative;
    z-index: 1;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text);
}

.feature-card__desc {
    position: relative;
    z-index: 1;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.75;
}

/* ========================================
   How It Works
   ======================================== */
.how-it-works {
    padding: 120px 0;
    background: var(--color-warm-bg);
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 32px;
    max-width: 880px;
    margin: 0 auto;
}

.step {
    display: grid;
    grid-template-columns: 100px 1fr 120px;
    gap: 32px;
    align-items: center;
    padding: 36px 40px;
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    border: 1px solid var(--color-border);
}

.step:hover {
    transform: translateX(12px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

.step__number {
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-primary);
    opacity: 0.18;
    line-height: 1;
    transition: opacity 0.3s ease;
}

.step:hover .step__number {
    opacity: 0.35;
}

.step__title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-text);
}

.step__desc {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.step__visual {
    display: flex;
    justify-content: center;
}

.step__icon-wrap {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary-bg), #fff);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    box-shadow: inset 0 0 0 2px rgba(95, 179, 176, 0.1);
    transition: all 0.35s ease;
}

.step:hover .step__icon-wrap {
    transform: scale(1.08);
    box-shadow: inset 0 0 0 2px rgba(95, 179, 176, 0.2), var(--shadow-sm);
}

/* ========================================
   Devices Section
   ======================================== */
.devices {
    padding: 120px 0;
    background: var(--color-bg);
}

.devices__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    max-width: 840px;
    margin: 0 auto;
}

.device-card {
    text-align: center;
    padding: 44px 36px;
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    overflow: hidden;
}

.device-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.device-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.device-card:hover::before {
    opacity: 1;
}

.device-card__image {
    margin-bottom: 28px;
    position: relative;
}

.device-card__img {
    width: 200px;
    height: 200px;
    max-width: 100%;
    object-fit: cover;
    border-radius: 50%;
    margin: 0 auto;
    display: block;
    box-shadow: var(--shadow-md);
    transition: transform 0.4s ease;
}

.device-card:hover .device-card__img {
    transform: scale(1.05);
}

.device-card__placeholder {
    width: 160px;
    height: 160px;
    background: linear-gradient(135deg, var(--color-warm-bg), var(--color-primary-bg));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.device-card__emoji {
    font-size: 3rem;
}

.device-card__name {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text);
}

.device-card__specs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
}

.device-card__specs li {
    display: inline-block;
    padding: 6px 14px;
    background: var(--color-warm-bg);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* ========================================
   Testimonials
   ======================================== */
.testimonials {
    padding: 120px 0;
    background: var(--color-warm-bg);
}

.testimonials__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.testimonial-card {
    padding: 36px 30px;
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
}

.testimonial-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

.testimonial-card__stars {
    font-size: 1.15rem;
    letter-spacing: 2px;
    margin-bottom: 18px;
}

.testimonial-card__text {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.85;
    margin-bottom: 24px;
    font-style: italic;
}

.testimonial-card__author {
    display: flex;
    flex-direction: column;
    border-top: 1px solid var(--color-border);
    padding-top: 18px;
}

.testimonial-card__name {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--color-text);
}

.testimonial-card__role {
    font-size: 0.82rem;
    color: var(--color-text-light);
    margin-top: 2px;
}

/* ========================================
   Download Section
   ======================================== */
.download {
    padding: 120px 0;
    background: var(--color-bg);
}

.download__card {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 56px;
    align-items: center;
    padding: 64px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-xl);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.download__card::before {
    content: '';
    position: absolute;
    width: 360px;
    height: 360px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    top: -120px;
    right: -120px;
}

.download__card::after {
    content: '';
    position: absolute;
    width: 240px;
    height: 240px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    bottom: -60px;
    left: -60px;
}

.download__content {
    position: relative;
    z-index: 1;
}

.download__title {
    font-size: clamp(1.875rem, 4vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 14px;
    letter-spacing: -0.03em;
}

.download__desc {
    font-size: 1.1rem;
    opacity: 0.92;
    margin-bottom: 36px;
    line-height: 1.7;
}

.download__methods {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.download__method {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 22px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.25);
    transition: all 0.3s ease;
    cursor: pointer;
}

.download__method:hover {
    background: rgba(255, 255, 255, 0.28);
}

.download__method--hidden {
    display: none;
}

.download__method-icon {
    flex-shrink: 0;
}

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

.download__method-text strong {
    font-size: 1rem;
    margin-bottom: 2px;
}

.download__method-text span {
    font-size: 0.82rem;
    opacity: 0.85;
}

.download__qrcode {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.download__qrcode-img {
    width: 170px;
    height: 170px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    background: #fff;
}

.download__qrcode-placeholder {
    padding: 20px;
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
}

.download__qrcode-label {
    font-size: 0.88rem;
    opacity: 0.9;
}

/* ========================================
   Safety Section
   ======================================== */
.safety {
    padding: 120px 0;
    background: var(--color-warm-bg);
}

.safety__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.safety-card {
    padding: 36px 24px;
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    overflow: hidden;
}

.safety-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 0;
    background: linear-gradient(180deg, var(--color-primary-bg), transparent);
    transition: height 0.4s ease;
    z-index: 0;
}

.safety-card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.safety-card:hover::before {
    height: 100%;
}

.safety-card__icon {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 68px;
    height: 68px;
    border-radius: var(--radius-md);
    margin: 0 auto 22px;
    color: #fff;
    transition: transform 0.4s ease;
}

.safety-card:hover .safety-card__icon {
    transform: scale(1.1) rotate(-4deg);
}

.safety-card__icon--material {
    background: linear-gradient(135deg, #5fb3b0, #4a9491);
}

.safety-card__icon--radiation {
    background: linear-gradient(135deg, #8fd4d1, #5fb3b0);
}

.safety-card__icon--privacy {
    background: linear-gradient(135deg, #9db5e8, #7a9bd8);
}

.safety-card__icon--control {
    background: linear-gradient(135deg, #ffc46b, #f5a623);
}

.safety-card__title {
    position: relative;
    z-index: 1;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text);
}

.safety-card__desc {
    position: relative;
    z-index: 1;
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    line-height: 1.75;
}

/* ========================================
   Brand Story Section
   ======================================== */
.brand-story {
    padding: 120px 0;
    background: var(--color-bg);
}

.brand-story__card {
    max-width: 900px;
    margin: 0 auto;
    padding: 56px 60px;
    background: linear-gradient(135deg, var(--color-warm-bg), var(--color-primary-bg));
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.brand-story__card::before {
    content: '';
    position: absolute;
    width: 280px;
    height: 280px;
    background: rgba(255, 154, 162, 0.08);
    border-radius: 50%;
    top: -80px;
    right: -80px;
}

.brand-story__card::after {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    background: rgba(95, 179, 176, 0.06);
    border-radius: 50%;
    bottom: -60px;
    left: -60px;
}

.brand-story__icon {
    position: relative;
    z-index: 1;
    width: 76px;
    height: 76px;
    margin: 0 auto 26px;
    border-radius: 50%;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.brand-story__title {
    position: relative;
    z-index: 1;
    font-size: clamp(1.5rem, 3.5vw, 2.25rem);
    font-weight: 800;
    margin-bottom: 28px;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.brand-story__content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    margin: 0 auto;
}

.brand-story__text {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
    margin-bottom: 18px;
}

.brand-story__text:last-of-type {
    margin-bottom: 0;
}

.brand-story__text strong {
    color: var(--color-primary-dark);
}

.brand-story__slogan {
    position: relative;
    z-index: 1;
    margin-top: 36px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary-dark);
    letter-spacing: 0.02em;
}

/* ========================================
   FAQ Page Specific Styles
   ======================================== */
.faq-page-hero {
    padding: 140px 0 60px;
    background: linear-gradient(160deg, var(--color-warm-bg) 0%, #fff 55%, var(--color-primary-bg) 100%);
    text-align: center;
}

.faq-page-hero__title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 900;
    color: var(--color-text);
    margin-top: 16px;
    margin-bottom: 16px;
    letter-spacing: -0.03em;
}

.faq-page-hero__desc {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

.faq-page {
    padding: 60px 0 120px;
    background: var(--color-bg);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.faq__answer-conclusion {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 10px;
}

.faq__answer-list {
    list-style: none;
    padding: 0;
    margin: 12px 0;
}

.faq__answer-list li {
    padding: 6px 0 6px 20px;
    position: relative;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.faq__answer-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.faq__more-link {
    color: var(--color-primary-dark);
    font-weight: 600;
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color 0.3s ease;
}

.faq__more-link:hover {
    color: var(--color-primary);
}

.faq__answer-conclusion {
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.faq__view-all {
    text-align: center;
    margin-top: 40px;
}

.faq__view-all .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.faq__answer-list {
    list-style: none;
    padding: 0;
    margin: 12px 0;
}

.faq__answer-list li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.faq__answer-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-primary);
}

.faq-cta {
    padding: 0 0 120px;
    background: var(--color-bg);
}

.faq-cta__card {
    text-align: center;
    padding: 56px 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-xl);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.faq-cta__card::before {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    top: -100px;
    right: -100px;
}

.faq-cta__title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    margin-bottom: 14px;
    letter-spacing: -0.02em;
    position: relative;
    z-index: 1;
}

.faq-cta__desc {
    font-size: 1.05rem;
    opacity: 0.92;
    margin-bottom: 32px;
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

.faq-cta__actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.faq-cta__actions .btn--outline {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.3);
}

.faq-cta__actions .btn--outline:hover {
    background: rgba(255, 255, 255, 0.28);
    border-color: rgba(255, 255, 255, 0.5);
    color: #fff;
}

/* ========================================
   FAQ Section
   ======================================== */
.faq {
    padding: 120px 0;
    background: var(--color-bg);
}

.faq__list {
    max-width: 840px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq__item {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 26px 30px;
    transition: all 0.3s ease;
}

.faq__item:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-sm);
}

.faq__item[open] {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.faq__question {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    cursor: pointer;
    list-style: none;
    outline: none;
    padding-right: 24px;
    line-height: 1.5;
}

.faq__question::-webkit-details-marker {
    display: none;
}

.faq__question::after {
    content: "+";
    float: right;
    color: var(--color-primary);
    font-weight: 300;
    font-size: 1.5rem;
    line-height: 1;
    transition: transform 0.3s ease;
    margin-right: -24px;
}

.faq__item[open] .faq__question::after {
    transform: rotate(45deg);
}

.faq__answer {
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    line-height: 1.85;
    font-size: 0.97rem;
}

/* ========================================
   Expert Quote Section
   ======================================== */
.expert-quote {
    padding: 120px 0;
    background: var(--color-primary-bg);
}

.expert-quote__card {
    max-width: 900px;
    margin: 0 auto;
    padding: 56px 60px;
    background: #fff;
    border-radius: var(--radius-lg);
    border-left: 6px solid var(--color-primary);
    box-shadow: var(--shadow-md);
    text-align: center;
    position: relative;
}

.expert-quote__icon {
    width: 76px;
    height: 76px;
    margin: 0 auto 26px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary-bg), #fff);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.expert-quote__text p {
    font-size: 1.3rem;
    line-height: 1.9;
    color: var(--color-text);
    font-style: italic;
    margin-bottom: 28px;
    position: relative;
    padding-left: 40px;
}

.expert-quote__text p::before {
    content: "\201C";
    position: absolute;
    left: 0;
    top: -10px;
    font-size: 3.25rem;
    line-height: 1;
    color: var(--color-primary);
    opacity: 0.25;
    font-style: normal;
}

.expert-quote__footer {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.expert-quote__attribution {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-primary-dark);
}

.expert-quote__note {
    font-size: 0.88rem;
    color: var(--color-text-light);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: 72px 0 32px;
    background: #2b2b2b;
    color: rgba(255, 255, 255, 0.7);
}

.footer__grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 52px;
}

.footer__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    color: #fff;
    font-size: 1.25rem;
    font-weight: 700;
}

.footer__logo img {
    width: 38px;
    height: 38px;
    border-radius: 8px;
}

.footer__desc {
    font-size: 0.95rem;
    line-height: 1.7;
}

.footer__links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 32px;
}

.footer__links-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
}

.footer__links-group ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer__links-group a {
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer__links-group a:hover {
    color: var(--color-primary-light);
}

.footer__bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.85rem;
}

.footer__icp {
    opacity: 0.5;
    color: inherit;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.footer__icp:hover {
    opacity: 0.8;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 1024px) {
    .hero__content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 60px;
    }

    .hero__text {
        max-width: 100%;
    }

    .hero__actions {
        justify-content: center;
    }

    .hero__stats {
        justify-content: center;
    }

    .hero__visual {
        order: -1;
    }

    .hero__showcase {
        max-width: 360px;
    }

    .hero__showcase-frame {
        max-width: 280px;
    }

    .hero__floating-card--1 {
        left: -4%;
    }

    .hero__floating-card--2 {
        right: -4%;
    }

    .hero__floating-card--3 {
        left: 0%;
    }

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

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

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

    .download__card {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 48px 32px;
    }

    .download__methods {
        justify-content: center;
    }

    .download__qrcode {
        order: -1;
    }

    .footer__grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav__menu {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        gap: 32px;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.3s ease;
    }

    .nav__menu--open {
        opacity: 1;
        pointer-events: all;
    }

    .nav__link {
        font-size: 1.3rem;
    }

    .nav__toggle {
        display: flex;
    }

    .features__grid {
        grid-template-columns: 1fr;
    }

    .safety__grid {
        grid-template-columns: 1fr;
    }

    .testimonials__grid {
        grid-template-columns: 1fr;
    }

    .step {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 28px 24px;
        gap: 20px;
    }

    .step__visual {
        order: -1;
    }

    .devices__grid {
        grid-template-columns: 1fr;
    }

    .hero__stats {
        gap: 28px;
    }

    .hero__stat-num {
        font-size: 1.5rem;
    }

    .hero__showcase {
        max-width: 280px;
    }

    .hero__showcase-frame {
        max-width: 220px;
        padding: 12px;
    }

    .hero__floating-card {
        padding: 8px 12px;
        font-size: 0.8rem;
    }

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

    .hero__floating-card--1 {
        left: -8%;
        top: 5%;
    }

    .hero__floating-card--2 {
        right: -8%;
    }

    .hero__floating-card--3 {
        left: -4%;
        bottom: 8%;
    }

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

    .footer__bottom {
        flex-direction: column;
        text-align: center;
    }

    .expert-quote__card {
        padding: 36px 28px;
    }

    .brand-story__card {
        padding: 36px 28px;
    }

    .faq-page-hero {
        padding: 120px 0 40px;
    }

    .faq-cta__card {
        padding: 40px 24px;
    }

    .expert-quote__text p {
        font-size: 1.1rem;
        padding-left: 28px;
    }

    .expert-quote__text p::before {
        font-size: 2.5rem;
        top: -6px;
    }

    .faq__item {
        padding: 22px 22px;
    }

    .faq__question {
        font-size: 1rem;
    }

    .download__card {
        padding: 40px 24px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 120px 0 70px;
    }

    .hero__showcase {
        max-width: 240px;
    }

    .hero__showcase-frame {
        max-width: 180px;
    }

    .hero__floating-card {
        display: none;
    }

    .download__methods {
        flex-direction: column;
    }

    .footer__links {
        grid-template-columns: 1fr;
    }

    .step__icon-wrap {
        width: 64px;
        height: 64px;
    }

    .device-card__img {
        width: 160px;
        height: 160px;
    }
}