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

html {
    scroll-behavior: smooth;
}

body {
    background: #f5f5f7;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: #1d1d1f;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding: 0 1.5rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 0 4rem;
}

/* ===== 导航栏 ===== */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    background: rgba(255, 255, 255, 0.72);
    border-radius: 40px;
    margin-bottom: 3rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.5);
    flex-wrap: wrap;
    gap: 0.8rem;
    position: sticky;
    top: 1rem;
    z-index: 100;
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
}

.logo {
    font-weight: 600;
    font-size: 1.5rem;
    letter-spacing: -0.02em;
    background: linear-gradient(145deg, #1d1d1f, #3a3a3e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo svg {
    width: 28px;
    height: 28px;
    stroke: #1d1d1f;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.nav-links a {
    text-decoration: none;
    color: #1d1d1f;
    font-weight: 450;
    font-size: 0.95rem;
    padding: 8px 16px;
    border-radius: 30px;
    transition: all 0.2s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: #0071e3;
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 60%;
}

.nav-links a:hover {
    background: rgba(0, 113, 227, 0.08);
}

.nav-links .btn-primary-nav {
    background: #0071e3;
    color: white;
    border: none;
    padding: 8px 22px;
    border-radius: 30px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-links .btn-primary-nav::after {
    display: none;
}

.nav-links .btn-primary-nav:hover {
    background: #0077ed;
    transform: scale(1.02);
    box-shadow: 0 8px 20px rgba(0, 113, 227, 0.3);
}

.nav-links .btn-outline-nav {
    border: 1px solid #d2d2d7;
    background: rgba(255, 255, 255, 0.5);
}

.nav-links .btn-outline-nav::after {
    display: none;
}

.nav-links .btn-outline-nav:hover {
    background: #0071e3;
    border-color: #0071e3;
    color: white;
    box-shadow: 0 6px 16px rgba(0, 113, 227, 0.25);
}

/* ===== 分隔线 ===== */
.section-divider {
    width: 100%;
    height: 1px;
    background: linear-gradient(to right, transparent, rgba(0, 113, 227, 0.15), transparent);
    margin: 2rem 0 3rem;
}

/* ===== Hero ===== */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 3.5rem 1.5rem 4rem;
    border-radius: 60px;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: saturate(180%) blur(16px);
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.6);
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 113, 227, 0.04) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(0, 113, 227, 0.08);
    color: #0071e3;
    font-size: 0.8rem;
    font-weight: 500;
    padding: 6px 18px;
    border-radius: 40px;
    letter-spacing: 0.3px;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(0, 113, 227, 0.1);
}

.hero-badge svg {
    width: 16px;
    height: 16px;
    stroke: #0071e3;
    fill: none;
    stroke-width: 2.5;
}

.typewriter-wrapper {
    min-height: 5.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 0.5rem;
    width: 100%;
}

#typewriter-text {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, #1d1d1f 0%, #4a4a4e 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
    max-width: 900px;
    word-break: break-all;
    
    
    
}

.cursor {
    display: inline-block;
    width: 4px;
    height: 3.2rem;
    background: #0071e3;
    margin-left: 4px;
    vertical-align: text-bottom;
    border-radius: 4px;
    animation: blink 1s step-end infinite;
    -webkit-text-fill-color: initial;
}

@keyframes blink {
    0%,
    100% {
        opacity: 1;
    }
    50% {
        opacity: 0;
    }
}

.speed-display {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: rgba(0, 113, 227, 0.06);
    padding: 8px 24px 8px 20px;
    border-radius: 60px;
    margin: 0.8rem 0 1.5rem;
    border: 1px solid rgba(0, 113, 227, 0.08);
}

.speed-display svg {
    width: 20px;
    height: 20px;
    stroke: #0071e3;
    fill: none;
    stroke-width: 2;
}

.speed-display .speed-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: #0071e3;
    letter-spacing: 0.5px;
}

.speed-display .speed-label {
    font-size: 0.95rem;
    color: #6e6e73;
    font-weight: 450;
}

.hero-desc {
    font-size: 1.15rem;
    font-weight: 400;
    color: #6e6e73;
    max-width: 680px;
    margin: 0.5rem auto 1.8rem;
    letter-spacing: -0.01em;
    padding: 0 1rem;
}

.hero-desc .highlight {
    color: #0071e3;
    font-weight: 600;
}

.cta-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-top: 0.5rem;
}

.btn-primary {
    background: #0071e3;
    color: white;
    border: none;
    padding: 14px 44px;
    border-radius: 60px;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    box-shadow: 0 10px 28px rgba(0, 113, 227, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.2);
    letter-spacing: 0.3px;
    text-decoration: none;
    display: inline-block;
}

.btn-primary:hover {
    background: #0077ed;
    transform: scale(1.02) translateY(-3px);
    box-shadow: 0 20px 40px rgba(0, 113, 227, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid #d2d2d7;
    color: #1d1d1f;
    padding: 14px 44px;
    border-radius: 60px;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.02);
    text-decoration: none;
    display: inline-block;
}

.btn-secondary:hover {
    background: white;
    border-color: #0071e3;
    color: #0071e3;
    transform: scale(1.02) translateY(-3px);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.06);
}

.section-title {
    text-align: center;
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.8rem;
}

.section-subtitle {
    text-align: center;
    color: #6e6e73;
    font-size: 1.15rem;
    margin-bottom: 3rem;
    font-weight: 400;
}