/* ============================================
   WEBOX.top - 微盒助理 官网样式表
   ============================================ */

/* --- CSS Variables --- */
:root {
    --color-primary: #4F46E5;
    --color-primary-dark: #4338CA;
    --color-primary-light: #EEF2FF;
    --color-secondary: #0EA5E9;
    --color-accent: #F59E0B;
    --color-success: #10B981;
    --color-text: #1E293B;
    --color-text-light: #64748B;
    --color-text-lighter: #94A3B8;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F8FAFC;
    --color-bg-dark: #0F172A;
    --color-border: #E2E8F0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --max-width: 1200px;
    --header-height: 72px;
    --transition: 0.3s ease;
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    overflow-x: hidden;
}

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

ul { list-style: none; }

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

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

/* --- Typography --- */
.section {
    padding: 100px 0;
}

.section__header {
    text-align: center;
    margin-bottom: 64px;
}

.section__title {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    color: var(--color-text);
}

.section__desc {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn--primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.btn--primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

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

.btn--outline:hover {
    background: var(--color-primary-light);
    transform: translateY(-1px);
}

/* ============================================
   Header / Navigation
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition);
}

.header.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    font-size: 1.25rem;
}

.logo__icon { font-size: 1.5rem; }

.logo__text { color: var(--color-text); }

.logo__dot { color: var(--color-primary); }

/* Nav */
.nav__list {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav__link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-light);
    transition: color var(--transition);
    position: relative;
}

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

.nav__link--cta {
    padding: 10px 24px;
    background: var(--color-primary);
    color: #fff;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.nav__link--cta:hover {
    background: var(--color-primary-dark);
    color: #fff;
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

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

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

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

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

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #EEF2FF 0%, #E0F2FE 50%, #F0FDF4 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.hero__title {
    font-size: 3.25rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero__highlight {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: 1.1875rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 36px;
}

.hero__subtitle strong {
    color: var(--color-primary);
}

.hero__actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

/* Stats */
.hero__stats {
    display: flex;
    gap: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat__number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary);
}

.stat__label {
    font-size: 0.875rem;
    color: var(--color-text-lighter);
}

/* Phone Mockup */
.hero__visual {
    display: flex;
    justify-content: center;
}

.phone-mock {
    width: 280px;
    background: #fff;
    border-radius: 36px;
    padding: 12px;
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(0,0,0,0.05);
    position: relative;
}

.phone-mock__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 16px 12px;
}

.phone-mock__time {
    font-size: 0.875rem;
    font-weight: 600;
}

.phone-mock__battery {
    display: inline-block;
    width: 22px;
    height: 10px;
    border: 1.5px solid #666;
    border-radius: 2px;
    position: relative;
}

.phone-mock__battery::after {
    content: '';
    position: absolute;
    right: -4px;
    top: 2px;
    width: 3px;
    height: 5px;
    background: #666;
    border-radius: 0 1px 1px 0;
}

.phone-mock__body {
    background: linear-gradient(135deg, #EEF2FF, #E0F2FE);
    border-radius: 24px;
    padding: 20px;
    min-height: 340px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.phone-mock__greeting {
    font-size: 1.125rem;
    font-weight: 700;
}

.phone-mock__weather {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.phone-mock__card {
    background: #fff;
    border-radius: 12px;
    padding: 14px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

.phone-mock__toolbar {
    display: flex;
    gap: 16px;
    justify-content: center;
    padding: 12px 0;
    font-size: 1.5rem;
    margin-top: auto;
}

.phone-mock__footer {
    display: flex;
    justify-content: space-around;
    padding: 12px 16px 4px;
    font-size: 1.25rem;
    color: var(--color-text-lighter);
}

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

.features__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: all var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.feature-card__icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    display: block;
}

.feature-card__title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card__desc {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ============================================
   Tools Showcase
   ============================================ */
.tools {
    background: var(--color-bg-alt);
}

.tools__tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 40px;
}

.tools__tab {
    padding: 8px 20px;
    border-radius: 999px;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    color: var(--color-text-light);
}

.tools__tab:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.tools__tab.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

.tools__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 16px;
}

.tool-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px 12px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: default;
    transition: all var(--transition);
    text-align: center;
}

.tool-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.tool-item__icon {
    font-size: 1.75rem;
}

.tool-item__name {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text);
}

/* Filter animation */
.tool-item.hidden {
    display: none;
}

/* ============================================
   Scenarios Section
   ============================================ */
.scenarios__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.scenario-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: all var(--transition);
}

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

.scenario-card__icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.scenario-card__title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.scenario-card__desc {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ============================================
   Privacy Section
   ============================================ */
.privacy {
    background: var(--color-bg-alt);
}

.privacy__content {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.privacy__item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    background: var(--color-bg);
    padding: 28px 32px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.privacy__item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.privacy__icon {
    font-size: 2rem;
    flex-shrink: 0;
    width: 48px;
    text-align: center;
}

.privacy__item h3 {
    font-size: 1.0625rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.privacy__item p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ============================================
   Download / CTA Section
   ============================================ */
.download {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
}

.download__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    max-width: 960px;
    margin: 0 auto;
}

.download__title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.3;
}

.download__desc {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: 36px;
}

.download__steps {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 28px;
}

.step {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 1rem;
}

.step__num {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.download__alt {
    font-size: 0.9375rem;
    opacity: 0.85;
}

.download__alt strong {
    font-weight: 700;
}

/* QR Code */
.download__qrcode {
    display: flex;
    justify-content: center;
}

.qrcode-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    width: 200px;
    height: 200px;
    justify-content: center;
}

.qrcode-icon {
    font-size: 4rem;
}

.qrcode-text {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
}

.qrcode-hint {
    font-size: 0.8125rem;
    color: var(--color-text-lighter);
}

/* ============================================
   QR Code Hover Effects
   ============================================ */

/* -- Download section: real QR image -- */
.qrcode-box {
    position: relative;
    overflow: hidden;
    background: #fff;
    border-radius: var(--radius-xl);
    padding: 32px;
    text-align: center;
    box-shadow: var(--shadow-xl);
}

.qrcode-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-xl);
    opacity: 0;
    transform: scale(0.85);
    transition: opacity 0.4s ease, transform 0.4s ease;
    pointer-events: none;
}

.qrcode-box:hover .qrcode-img {
    opacity: 1;
    transform: scale(1);
}

.qrcode-box:hover .qrcode-placeholder {
    opacity: 0;
    transform: scale(0.85);
}

.qrcode-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    width: 200px;
    height: 200px;
    justify-content: center;
    transition: opacity 0.4s ease, transform 0.4s ease;
}

/* -- Hero section: button tooltip QR -- */
.qr-hover-trigger {
    position: relative;
    display: inline-flex;
}

.qr-hover-img {
    position: absolute;
    bottom: calc(100% + 16px);
    left: 50%;
    transform: translateX(-50%) scale(0.8);
    opacity: 0;
    pointer-events: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    transition: opacity 0.35s ease, transform 0.35s ease;
    width: 160px;
    height: 160px;
    object-fit: cover;
    z-index: 100;
}

.qr-hover-trigger:hover .qr-hover-img {
    opacity: 1;
    transform: translateX(-50%) scale(1);
}

/* Arrow indicator below the tooltip QR */
.qr-hover-img::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: #fff;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-bg-dark);
    color: #fff;
    padding: 64px 0 32px;
}

.footer__inner {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 64px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer__brand .logo__text { color: #fff; }

.footer__desc {
    margin-top: 16px;
    font-size: 0.9375rem;
    color: rgba(255,255,255,0.6);
    line-height: 1.7;
}

.footer__links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer__title {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 20px;
    color: rgba(255,255,255,0.5);
}

.footer__col ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer__col a,
.footer__col span {
    font-size: 0.9375rem;
    color: rgba(255,255,255,0.7);
    transition: color var(--transition);
}

.footer__col a:hover {
    color: #fff;
}

.footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    font-size: 0.875rem;
    color: rgba(255,255,255,0.4);
}

.footer__icp a {
    color: rgba(255,255,255,0.4);
}

.footer__icp a:hover {
    color: rgba(255,255,255,0.7);
}

/* ============================================
   Back to Top
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition);
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    z-index: 900;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}

/* ============================================
   Responsive Styles
   ============================================ */

/* Tablet */
@media (max-width: 1024px) {
    .hero__title { font-size: 2.75rem; }
    .features__grid { grid-template-columns: repeat(2, 1fr); }
    .scenarios__grid { grid-template-columns: repeat(2, 1fr); }
    .download__inner { grid-template-columns: 1fr; text-align: center; }
    .download__steps { align-items: center; }
    .footer__inner { grid-template-columns: 1fr; gap: 40px; }
}

/* Mobile */
@media (max-width: 768px) {
    .section { padding: 64px 0; }
    .section__title { font-size: 1.75rem; }
    .section__desc { font-size: 1rem; }
    .section__header { margin-bottom: 40px; }

    /* Nav */
    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(12px);
        padding: 24px;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        transition: all var(--transition);
        pointer-events: none;
    }

    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav__list {
        flex-direction: column;
        gap: 20px;
        align-items: stretch;
    }

    .nav__link--cta {
        text-align: center;
    }

    .hamburger { display: flex; }

    /* Hero */
    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }

    .hero__inner {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .hero__title { font-size: 2.25rem; }
    .hero__subtitle { font-size: 1rem; }
    .hero__actions { flex-direction: column; }
    .hero__stats { gap: 24px; }

    .hide-mobile { display: none; }

    .phone-mock { width: 240px; }

    /* Features */
    .features__grid { grid-template-columns: 1fr; gap: 20px; }

    /* Tools */
    .tools__grid {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
        gap: 12px;
    }

    .tool-item { padding: 16px 8px; }
    .tool-item__icon { font-size: 1.5rem; }

    /* Scenarios */
    .scenarios__grid { grid-template-columns: 1fr; gap: 16px; }

    /* Privacy */
    .privacy__item { flex-direction: column; padding: 20px; }
    .privacy__icon { width: auto; text-align: left; }

    /* Download */
    .download__title { font-size: 1.75rem; }

    .qrcode-placeholder {
        width: 160px;
        height: 160px;
    }

    .qrcode-box {
        padding: 20px;
    }

    /* Mobile: hide hero tooltip QR (touch devices can't hover) */
    .qr-hover-img {
        display: none;
    }

    /* Footer */
    .footer__links { grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .footer__bottom { flex-direction: column; gap: 8px; text-align: center; }
}

/* Small Mobile */
@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero__title { font-size: 1.75rem; }
    .stat__number { font-size: 1.5rem; }
    .tools__grid { grid-template-columns: repeat(3, 1fr); }
    .footer__links { grid-template-columns: 1fr; }

    .qrcode-placeholder {
        width: 140px;
        height: 140px;
    }
    .qrcode-box {
        padding: 16px;
    }
}

/* ============================================
   Scroll Animations (Intersection Observer)
   ============================================ */
[data-aos] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

[data-aos-delay="100"] { transition-delay: 0.1s; }
[data-aos-delay="200"] { transition-delay: 0.2s; }
[data-aos-delay="300"] { transition-delay: 0.3s; }
[data-aos-delay="400"] { transition-delay: 0.4s; }
[data-aos-delay="500"] { transition-delay: 0.5s; }