/* ==========================================================================
   index.css — 首页页面样式（介绍落地页，科幻极简风）
   类别：页面（index.php 专属）
   ========================================================================== */

.landing-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 56px 24px 72px;
    position: relative;
}

/* 顶部青色光晕装饰 */
.landing-main::before {
    content: '';
    position: absolute;
    top: -80px;
    left: 50%;
    transform: translateX(-50%);
    width: 680px;
    height: 340px;
    background: radial-gradient(50% 50% at 50% 50%, rgba(34, 211, 238, 0.12), transparent 70%);
    pointer-events: none;
}

/* ---------- Hero ---------- */
.landing-hero {
    max-width: 760px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-icon {
    font-size: 3.4rem;
    color: var(--accent);
    margin-bottom: 18px;
    filter: drop-shadow(0 0 14px rgba(34, 211, 238, 0.55));
}

.hero-title {
    font-size: clamp(2.4rem, 6vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.08;
    color: #eaf6ff;
    text-shadow: 0 0 30px rgba(34, 211, 238, 0.3);
}

.hero-sub {
    margin: 18px auto 34px;
    font-size: 1.08rem;
    color: var(--text-secondary);
    max-width: 560px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    justify-content: center;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 34px;
    border-radius: var(--radius-pill);
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    color: #04121a;
    font-weight: 700;
    font-size: 0.98rem;
    text-decoration: none;
    box-shadow: 0 0 22px rgba(34, 211, 238, 0.28);
    transition: filter 0.2s, box-shadow 0.2s, transform 0.15s;
}

.hero-cta:hover {
    filter: brightness(1.12);
    box-shadow: 0 0 34px rgba(34, 211, 238, 0.42);
    transform: translateY(-1px);
}

/* ---------- 特性简介（落地页） ---------- */
.landing-features {
    margin-top: 64px;
    max-width: 900px;
    width: 100%;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    position: relative;
    z-index: 1;
}

.feature {
    padding: 26px 22px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    text-align: center;
    transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}

.feature:hover {
    border-color: rgba(34, 211, 238, 0.35);
    box-shadow: 0 0 24px rgba(34, 211, 238, 0.12);
    transform: translateY(-3px);
}

.feature iconify-icon {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 12px;
    filter: drop-shadow(0 0 10px rgba(34, 211, 238, 0.4));
}

.feature-title {
    font-size: 1.02rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-desc {
    font-size: 0.84rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ---------- 移动端 ---------- */
@media (max-width: 720px) {
    .landing-main { padding: 40px 18px 56px; }
    .landing-features { grid-template-columns: 1fr; gap: 14px; }
}