:root {
    --color-water: #0F3B57;
    --color-water-light: #1C4E6E;
    --color-water-dark: #0A2C42;
    --color-wood: #1E7D5A;
    --color-wood-light: #34A577;
    --color-wood-dark: #155F45;
    --color-bg-warm: #F2F6F8;
    --color-card-mist: #E8F1F4;
    --color-card-white: #FFFFFF;
    --color-text-ink: #16313D;
    --color-text-ink-light: #3D5560;
    --color-accent: #2A9D8F;
    --color-accent-light: #3FBDAE;
    --color-trust-bg: #E2F0EE;
    --color-wechat-green: #1E7D5A;

    --space-8: 8px;
    --space-16: 16px;
    --space-24: 24px;
    --space-40: 40px;
    --space-60: 60px;
    --space-80: 80px;

    --text-12: 12px;
    --text-14: 14px;
    --text-16: 16px;
    --text-20: 20px;
    --text-28: 28px;
    --text-40: 40px;

    --grid-gap: 24px;
    --max-width: 1200px;
    --border-radius-sm: 6px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --border-radius-round: 50%;

    --shadow-sm: 0 1px 3px rgba(27, 42, 51, 0.06);
    --shadow-md: 0 4px 16px rgba(27, 42, 51, 0.08);
    --shadow-lg: 0 8px 32px rgba(27, 42, 51, 0.12);
    --shadow-hover: 0 12px 40px rgba(27, 42, 51, 0.18);
    --shadow-floating: 0 8px 30px rgba(0,0,0,0.15);

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);

    --font-body: 'Inter', 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg-warm);
    color: var(--color-text-ink);
    line-height: 1.8;
    letter-spacing: 0.02em;
    overflow-x: hidden;
    min-height: 100vh;
}

h1, h2, h3, h4, .sans-font {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.01em;
}

.section-module {
    padding: var(--space-60) 0;
    position: relative;
}
.section-module--alt {
    background-color: var(--color-card-mist);
}

.fade-in-up {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s cubic-bezier(0.22, 0.61, 0.36, 1),
                transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
}
.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.stagger-1 { transition-delay: 0.05s; }
.stagger-2 { transition-delay: 0.15s; }
.stagger-3 { transition-delay: 0.25s; }
.stagger-4 { transition-delay: 0.35s; }

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

/* =============================================
   固定顶部栏
   ============================================= */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-24);
    background: rgba(242, 246, 248, 0.95);
    box-shadow: 0 1px 8px rgba(0,0,0,0.08);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.site-header__brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.site-header__logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.site-header__name {
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: 24px;
    font-weight: 700;
    color: var(--color-water);
    white-space: nowrap;
    letter-spacing: 0.04em;
}

.site-header__right {
    display: flex;
    align-items: center;
    gap: var(--space-24);
}

.header-qr__toggle {
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: var(--text-14);
    font-weight: 600;
    color: #fff;
    letter-spacing: 0.04em;
    padding: 8px 20px;
    background: linear-gradient(135deg, #0F3B57 0%, #1E7D5A 100%);
    border: none;
    border-radius: 20px;
    cursor: pointer;
    white-space: nowrap;
    transition: background var(--transition-fast), transform var(--transition-fast);
}
.header-qr__toggle:hover {
    background: linear-gradient(135deg, #0A2C42 0%, #155F45 100%);
    transform: translateY(-1px);
}

.header-qr {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-16);
    cursor: pointer;
}

.header-qr__address {
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: var(--text-14);
    color: var(--color-text-ink-light);
    white-space: nowrap;
    letter-spacing: 0.03em;
    transition: color var(--transition-fast);
}
.header-qr__address:hover {
    color: var(--color-water);
}

.header-qr__popup {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    background: white;
    padding: 12px;
    border-radius: 16px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.25);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px) scale(0.95);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 220px;
    z-index: 110;
}
.header-qr__popup.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}
.header-qr__image {
    width: 180px;
    height: 180px;
    border-radius: 8px;
    display: block;
}

@media (max-width: 768px) {
    .header-qr__popup { display: none; }
}


/* =============================================
   模块1：品牌标识区 (Hero)
   ============================================= */
.hero {
    position: relative;
    min-height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: calc(var(--space-60) + 80px) var(--space-24) var(--space-60);
    overflow: hidden;
    background: radial-gradient(ellipse at 50% 40%, rgba(15, 59, 87, 0.05) 0%, transparent 70%),
                var(--color-bg-warm);
}

.hero__bg-symbol {
    position: absolute;
    font-family: 'Georgia', 'Times New Roman', serif;
    font-weight: 700;
    color: var(--color-water);
    opacity: 0.04;
    pointer-events: none;
    user-select: none;
    animation: floatSymbol 18s ease-in-out infinite;
    z-index: 0;
}
.hero__bg-symbol--pi1 { font-size: 260px; top: -10%; left: -5%; }
.hero__bg-symbol--pi2 { font-size: 200px; bottom: -5%; right: -4%; }
.hero__bg-symbol--beta1 { font-size: 220px; top: 10%; right: 5%; }
.hero__bg-symbol--beta2 { font-size: 160px; bottom: 0; left: 8%; }

@keyframes floatSymbol {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-15px) rotate(1deg); }
    50% { transform: translateY(-5px) rotate(-1deg); }
    75% { transform: translateY(-12px) rotate(0.5deg); }
}

.hero__inner {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-16);
    max-width: 680px;
}

.hero__tagline {
    font-family: var(--font-heading);
    font-size: 26px;
    font-weight: 700;
    color: var(--color-water);
    letter-spacing: 0.06em;
    line-height: 1.3;
}

.hero__core {
    font-size: 20px;
    font-weight: 500;
    color: var(--color-text-ink);
    letter-spacing: 0.05em;
    line-height: 1.4;
}

.hero__method {
    color: var(--color-water);
    font-weight: 700;
    padding: 0 4px;
}

.hero__divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-water), var(--color-accent));
    border-radius: 2px;
    margin: var(--space-8) auto;
}

.hero__skills {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-8);
    flex-wrap: wrap;
}

.hero__skill {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 700;
    color: var(--color-water);
    letter-spacing: 0.06em;
    line-height: 1.4;
}

.hero__skill-divider {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1.4;
    padding: 0 var(--space-4);
}

.hero__closing {
    font-size: 18px;
    font-weight: 500;
    color: var(--color-text-ink-light);
    letter-spacing: 0.04em;
    line-height: 1.6;
}
.hero__closing-from {
    color: var(--color-text-ink);
    font-weight: 500;
}
.hero__closing-to {
    color: var(--color-water);
    font-weight: 700;
    background: linear-gradient(to top, rgba(15,59,87,0.12) 40%, transparent 40%);
    padding: 0 4px;
}

/* =============================================
   模块2：信任横条
   ============================================= */
.trust-bar {
    padding: var(--space-24) 0 var(--space-40);
}
.trust-bar__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--grid-gap);
}
.trust-bar__card {
    background: var(--color-trust-bg);
    border-radius: var(--border-radius-sm);
    padding: var(--space-16) var(--space-16) var(--space-16) var(--space-24);
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-12);
    font-size: var(--text-16);
    color: var(--color-text-ink);
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-weight: 500;
    border-left: 4px solid var(--color-wood);
    transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}
.trust-bar__card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.trust-bar__icon { font-size: 24px; flex-shrink: 0; }
.trust-bar__sub {
    font-size: 12px;
    color: var(--color-wood);
    font-weight: 400;
    margin-top: 2px;
    line-height: 1.4;
}

/* =============================================
   模块2.5：教育理念
   ============================================= */
.philosophy__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--grid-gap);
}

.philosophy__card {
    background: var(--color-card-white);
    border-radius: var(--border-radius-md);
    padding: var(--space-24);
    display: flex;
    flex-direction: column;
    gap: var(--space-16);
    border-left: 4px solid var(--color-accent);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}
.philosophy__card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.philosophy__card-quote {
    font-family: var(--font-heading);
    font-size: var(--text-20);
    font-weight: 700;
    color: var(--color-water);
    line-height: 1.3;
    letter-spacing: 0.04em;
}

.philosophy__card-divider {
    width: 40px;
    height: 2px;
    background: var(--color-accent);
    border-radius: 1px;
}

.philosophy__card-title {
    font-size: var(--text-16);
    font-weight: 700;
    color: var(--color-wood);
    margin-bottom: var(--space-8);
    line-height: 1.4;
}

.philosophy__card-desc {
    font-size: var(--text-14);
    color: var(--color-text-ink-light);
    line-height: 1.8;
    letter-spacing: 0.02em;
}
.philosophy__card-desc strong {
    color: var(--color-water);
    font-weight: 700;
}

/* =============================================
   模块3：教学内容
   ============================================= */
.teaching-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-40);
    align-items: center;
    padding: var(--space-40) 0;
    border-bottom: 1px solid rgba(42, 157, 143, 0.25);
}
.teaching-item:last-child { border-bottom: none; }
.teaching-item__text { padding: var(--space-16) 0; }
.teaching-item__number {
    font-family: 'Inter', 'PingFang SC', sans-serif;
    font-size: var(--text-14);
    font-weight: 600;
    color: var(--color-wood);
    letter-spacing: 0.06em;
    margin-bottom: var(--space-8);
    display: block;
}
.teaching-item__title {
    font-size: var(--text-28);
    color: var(--color-water);
    margin-bottom: var(--space-12);
    line-height: 1.3;
}
.teaching-item__desc {
    font-size: var(--text-16);
    color: var(--color-text-ink-light);
    line-height: 1.8;
}
.teaching-item__illustration {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-16);
}
.teaching-item__illustration svg {
    width: 100%;
    max-width: 300px;
    height: auto;
}

.teaching-item--even .teaching-item__text { order: 2; }
.teaching-item--even .teaching-item__illustration { order: 1; }

/* =============================================
   模块6：过往成果/家长反馈（微信截图）
   ============================================= */
.testimonials__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-24);
    align-items: start;
}
.testimonial-img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    display: block;
}

/* =============================================
   模块8：页脚
   ============================================= */
.footer {
    background: var(--color-water-dark);
    color: rgba(255,255,255,0.7);
    padding: var(--space-24) var(--space-24);
}
.footer__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-16);
    max-width: var(--max-width);
    margin: 0 auto;
}
.footer__left {
    font-size: var(--text-14);
    letter-spacing: 0.04em;
    line-height: 1.8;
    font-family: 'Inter', 'PingFang SC', sans-serif;
}
.footer__right {
    font-family: 'Georgia', serif;
    font-size: var(--text-20);
    font-weight: 700;
    color: rgba(255,255,255,0.15);
    user-select: none;
}



/* =============================================
   微信二维码弹窗
   ============================================= */
.qr-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.qr-modal.active {
    opacity: 1;
    visibility: visible;
}
.qr-modal__overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    cursor: pointer;
}
.qr-modal__content {
    position: relative;
    background: #fff;
    border-radius: 20px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.qr-modal.active .qr-modal__content {
    transform: scale(1);
}
.qr-modal__close {
    position: absolute;
    top: 8px;
    right: 12px;
    background: none;
    border: none;
    font-size: 28px;
    color: #999;
    cursor: pointer;
    line-height: 1;
    padding: 4px;
    transition: color var(--transition-fast);
}
.qr-modal__close:hover {
    color: #333;
}
.qr-modal__image {
    width: 200px;
    height: 200px;
    border-radius: 12px;
    display: block;
}
.qr-modal__hint {
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: 14px;
    color: #888;
    text-align: center;
}

@media (max-width: 480px) {
    .qr-modal__content {
        padding: 24px;
        margin: 0 20px;
    }
    .qr-modal__image {
        width: 180px;
        height: 180px;
    }
}

.module-heading {
    text-align: center;
    margin-bottom: var(--space-40);
}
.module-heading__title {
    font-size: var(--text-28);
    color: var(--color-water);
    letter-spacing: 0.04em;
    position: relative;
    display: inline-block;
}
.module-heading__title::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: var(--color-accent);
    margin: var(--space-12) auto 0;
    border-radius: 2px;
}

/* =============================================
   响应式：768px以下
   ============================================= */
@media (max-width: 768px) {
    :root {
        --space-60: 40px;
        --space-40: 28px;
        --space-24: 16px;
    }

    .site-header {
        height: 64px;
        padding: 0 12px;
    }
    .site-header__logo { width: 40px; height: 40px; }
    .site-header__name { font-size: 20px; }
    .site-header__right { gap: var(--space-16); }
    .header-qr__toggle { font-size: var(--text-12); padding: 6px 16px; }
    .header-qr__address { font-size: var(--text-12); }

    .hero {
        padding: calc(var(--space-40) + 72px) var(--space-16) var(--space-40);
    }
    .hero__tagline { font-size: 20px; }
    .hero__core { font-size: 17px; }
    .hero__skill { font-size: 17px; }
    .hero__skill-divider { font-size: 17px; }
    .hero__closing { font-size: 16px; }
    .hero__bg-symbol { opacity: 0.025 !important; }

    .trust-bar__grid {
        grid-template-columns: 1fr;
        gap: var(--space-12);
    }
    .trust-bar__card {
        padding: var(--space-12) var(--space-12) var(--space-12) var(--space-20);
        font-size: 15px;
        min-height: 44px;
    }

    .philosophy__grid {
        grid-template-columns: 1fr;
        gap: var(--space-16);
    }
    .philosophy__card { padding: var(--space-16); }

    .teaching-item {
        grid-template-columns: 1fr;
        gap: var(--space-16);
        padding: var(--space-24) 0;
    }
    .teaching-item--even .teaching-item__text { order: 0; }
    .teaching-item--even .teaching-item__illustration { order: 0; }
    .teaching-item__illustration { display: none; }
    .teaching-item__title { font-size: var(--text-20); }
    .teaching-item__desc { font-size: 15px; }

    .testimonials__grid {
        grid-template-columns: 1fr;
        gap: var(--space-16);
    }

    .footer__inner { flex-direction: column; text-align: center; }
    .footer__right { font-size: var(--text-16); }

    .module-heading__title { font-size: var(--text-20); }
}

@media (max-width: 480px) {
    .hero { padding: calc(var(--space-40) + 72px) var(--space-16) var(--space-40); }
    .hero__inner { gap: var(--space-12); }
    .hero__tagline { font-size: 17px; }
    .hero__core { font-size: 15px; }
    .hero__skill { font-size: 15px; }
    .hero__skill-divider { font-size: 15px; }
    .hero__closing { font-size: 14px; }
}