:root {
    --primary: #1890FF;
    --primary-dark: #096DD9;
    --accent: #FA8C16;
    --text-main: #1F2937;
    --text-sub: #6B7280;
    --bg-gradient: linear-gradient(135deg, #E6F7FF 0%, #FFFFFF 100%);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: 1px solid rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.05);
    --radius: 24px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-gradient);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navbar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: 0.3s;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    padding: 15px 0;
}

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

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

.logo { height: 40px; }
.brand-name { font-size: 22px; font-weight: 700; color: var(--text-main); }

.dl-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
    box-shadow: 0 4px 12px rgba(24, 144, 255, 0.3);
}

.dl-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    padding: 80px 0 120px;
    position: relative;
    overflow: hidden;
    text-align: center;
}

.hero-title {
    font-size: 56px;
    line-height: 1.1;
    margin-bottom: 20px;
    background: linear-gradient(90deg, #1890FF, #FA8C16);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 20px;
    color: var(--text-sub);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-visual {
    position: relative;
    width: 320px;
    height: 600px;
    margin: 60px auto 0;
}

.phone-mockup {
    width: 100%;
    height: 100%;
    background: #000;
    border-radius: 40px;
    border: 8px solid #fff;
    box-shadow: 0 25px 60px rgba(24, 144, 255, 0.25);
    overflow: hidden;
    position: relative;
    z-index: 2;
}

.phone-mockup img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Floating Cards */
.float-card {
    position: absolute;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: var(--glass-border);
    padding: 15px 20px;
    border-radius: 16px;
    box-shadow: var(--glass-shadow);
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    color: var(--text-main);
    z-index: 3;
    transition: transform 0.1s ease-out;
}

.fc-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
}

.c1 { top: 15%; left: -140px; }
.c1 .fc-icon { background: #FA8C16; }

.c2 { top: 30%; right: -120px; }
.c2 .fc-icon { background: #1890FF; }

.c3 { bottom: 20%; left: -100px; }
.c3 .fc-icon { background: #52C41A; }

.hero-bg-circle {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(24, 144, 255, 0.1) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
}

/* Bento Grid Features */
.features { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 { font-size: 36px; margin-bottom: 15px; }
.section-header p { color: var(--text-sub); }

.bento-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 280px);
    gap: 24px;
}

.bento-item {
    background: var(--white);
    border-radius: var(--radius);
    padding: 30px;
    position: relative;
    overflow: hidden;
    transition: 0.3s;
    border: 1px solid #F0F0F0;
}

.bento-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
}

.b-large { grid-column: span 2; grid-row: span 2; background: linear-gradient(135deg, #1890FF 0%, #69C0FF 100%); color: white; }
.b-wide { grid-column: span 2; }
.b-tall { grid-row: span 2; }

.b-large h3 { font-size: 32px; margin-bottom: 15px; }
.b-large p { opacity: 0.9; max-width: 80%; }
.b-icon-bg {
    position: absolute;
    bottom: -20px;
    right: -20px;
    font-size: 180px;
    opacity: 0.1;
    transform: rotate(-15deg);
}

.bento-icon {
    width: 50px;
    height: 50px;
    background: #F0F5FF;
    color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
}

.bento-item h3 { font-size: 20px; margin-bottom: 10px; font-weight: 700; }
.bento-item p { color: var(--text-sub); font-size: 14px; }
.b-large p { color: white; }

/* Breathing Button */
.breathing-btn {
    animation: breathe 3s infinite ease-in-out;
}

@keyframes breathe {
    0% { box-shadow: 0 0 0 0 rgba(24, 144, 255, 0.4); transform: scale(1); }
    50% { box-shadow: 0 0 0 15px rgba(24, 144, 255, 0); transform: scale(1.05); }
    100% { box-shadow: 0 0 0 0 rgba(24, 144, 255, 0); transform: scale(1); }
}

/* Footer */
.footer {
    padding: 60px 0;
    background: var(--white);
    border-top: 1px solid #eee;
}

.seo-box {
    background: #FAFAFA;
    padding: 30px;
    border-radius: 16px;
    margin-bottom: 40px;
}

.seo-box h3 { font-size: 16px; margin-bottom: 10px; color: #333; }
.seo-box p { font-size: 13px; color: #888; line-height: 1.8; }

.footer-copy { text-align: center; color: #999; font-size: 12px; }

/* Responsive */
@media (max-width: 900px) {
    .bento-grid { grid-template-columns: 1fr; grid-template-rows: auto; }
    .b-large, .b-wide, .b-tall { grid-column: auto; grid-row: auto; min-height: 200px; }
    
    .hero-title { font-size: 42px; }
    .hero-visual { width: 280px; height: 560px; margin-top: 40px; }
    
    .float-card { position: relative; top: auto; left: auto; right: auto; bottom: auto; margin: 10px auto; width: fit-content; transform: none !important; }
    .hero-visual { display: flex; flex-direction: column; height: auto; background: transparent; box-shadow: none; border: none; }
    .phone-mockup { height: 500px; margin-bottom: 20px; border: 8px solid #333; }
}