:root {
    --color-primary: #4f46e5;
    --color-secondary: #06b6d4;
    --bg-main: #0b0f1a;
    --bg-card: #111827;
    --bg-soft: #161f33;
    --border: #243047;
    --text-main: #ffffff;
    --text-secondary: #9ca3af;
    --ok: #34d399;
    --warn: #f59e0b;
}

* {
    box-sizing: border-box;
    font-family: "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;
}

body {
    margin: 0;
    background: radial-gradient(1200px 480px at 70% -10%, rgba(79, 70, 229, 0.24), transparent 70%), var(--bg-main);
    color: var(--text-main);
}

a {
    color: #c4b5fd;
}

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

.site-nav {
    position: relative;
    z-index: 10;
    background: #0f172a;
    border-bottom: 1px solid #243047;
}

body.landing .site-nav {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(8px);
    background: rgba(11, 15, 26, 0.7);
    border-bottom: 1px solid rgba(36, 48, 71, 0.6);
}

.site-nav .container {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    margin: 0;
    font-size: 20px;
    letter-spacing: 0.5px;
}

.nav-links {
    display: flex;
    gap: 16px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
}

.nav-links a:hover {
    color: #ddd6fe;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    height: 48px;
    padding: 0 24px;
    font-weight: 600;
    border: 1px solid transparent;
    text-decoration: none;
    cursor: pointer;
}

.btn-primary {
    color: #fff;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    box-shadow: 0 8px 24px rgba(79, 70, 229, 0.35);
}

.btn-primary:hover {
    filter: brightness(1.08);
}

.btn-secondary {
    background: transparent;
    border-color: #334155;
    color: #d1d5db;
}

section {
    padding: 80px 0;
}

.hero {
    padding-top: 76px;
    min-height: 760px;
}

.hero-grid {
    display: grid;
    gap: 28px;
    grid-template-columns: 1.1fr 1fr;
    align-items: center;
}

.hero h1 {
    margin: 0 0 18px;
    font-size: clamp(30px, 5vw, 48px);
    line-height: 1.15;
}

.hero p {
    margin: 0 0 24px;
    color: var(--text-secondary);
    font-size: 18px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.card {
    background: linear-gradient(180deg, rgba(17, 24, 39, 0.96), rgba(17, 24, 39, 0.86));
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
}

.ai-panel {
    background: linear-gradient(165deg, rgba(79, 70, 229, 0.12), rgba(6, 182, 212, 0.08));
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    min-height: 420px;
    max-width: 560px;
    padding: 20px;
}

.ai-panel-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 32px;
    margin-bottom: 12px;
}

.ai-panel-title {
    color: var(--text-secondary);
    font-size: 14px;
}

.tag-ai {
    display: inline-flex;
    height: 24px;
    align-items: center;
    border-radius: 999px;
    padding: 0 10px;
    background: rgba(79, 70, 229, 0.15);
    color: #a5b4fc;
    font-size: 12px;
    font-weight: 700;
}

.ai-flow {
    margin-top: 14px;
    display: grid;
    gap: 12px;
}

.hidden {
    display: none !important;
}

.chat-user,
.chat-ai {
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 14px;
}

.chat-user {
    justify-self: end;
    max-width: 72%;
    background: #4f46e5;
    color: #fff;
}

.chat-ai {
    background: #1f2937;
    color: #fff;
}

.bubble {
    border-radius: 12px;
    padding: 10px 12px;
    background: var(--bg-soft);
    border: 1px solid #253352;
    color: #dbeafe;
    font-size: 14px;
}

.hero-run-btn {
    width: 100%;
    height: 40px;
    border-radius: 10px;
    margin: 4px 0 0;
}
.hero-run-btn.secondary {
    background: #334155;
}

.demo-examples {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.ex-chip {
    width: auto;
    height: 30px;
    margin: 0;
    padding: 0 10px;
    border-radius: 999px;
    background: rgba(79, 70, 229, 0.16);
    border: 1px solid rgba(79, 70, 229, 0.4);
    color: #c7d2fe;
    font-size: 12px;
}

.ex-chip:hover {
    background: rgba(79, 70, 229, 0.26);
}

.typing {
    overflow: hidden;
    white-space: nowrap;
    border-right: 2px solid #fff;
    animation: typing 2.2s steps(30, end), blink 0.8s infinite;
}

.thinking-dots {
    display: inline-flex;
    gap: 6px;
    padding: 0 2px;
}

.thinking-dots span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #93c5fd;
    animation: dot 1.2s infinite ease-in-out;
}

.thinking-dots span:nth-child(2) { animation-delay: 0.15s; }
.thinking-dots span:nth-child(3) { animation-delay: 0.3s; }

@keyframes dot {
    0%, 80%, 100% { transform: translateY(0); opacity: 0.35; }
    40% { transform: translateY(-4px); opacity: 1; }
}

.preview {
    margin-top: 4px;
    padding: 16px;
    border-radius: 12px;
    background: #0b1220;
    border: 1px solid #1f2a44;
    font-size: 13px;
    color: #e5e7eb;
}

.preview mark {
    color: #67e8f9;
    background: transparent;
    font-weight: 700;
}

.status-rail {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    height: 24px;
    border-radius: 999px;
    padding: 0 10px;
    background: rgba(30, 41, 59, 0.7);
    border: 1px solid #334155;
    color: #94a3b8;
    font-size: 12px;
}

.status-pill.active {
    color: #dbeafe;
    border-color: #60a5fa;
    background: rgba(37, 99, 235, 0.2);
}

.ai-input {
    height: 56px;
    border-radius: 14px;
    padding: 0 16px;
    background: #111827;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #fff;
}

.ai-input::placeholder {
    color: #9ca3af;
}

@keyframes typing {
    from { width: 0; }
    to { width: 100%; }
}

@keyframes blink {
    50% { border-color: transparent; }
}

.section-title {
    margin: 0 0 12px;
    font-size: 30px;
}

.section-sub {
    margin: 0 0 22px;
    color: var(--text-secondary);
}

.grid-3 {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.scene-card:hover,
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(79, 70, 229, 0.4);
}

.scene-card,
.feature-card {
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.scene-step {
    color: #a5b4fc;
    font-weight: 700;
    margin: 8px 0;
}

.workflow-line {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
}

.wf-node {
    text-align: center;
    position: relative;
}

.wf-node:not(:last-child)::after {
    content: "→";
    position: absolute;
    right: -14px;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
    font-size: 22px;
}

.wf-icon {
    font-size: 28px;
    margin-bottom: 10px;
}

.steps-timeline {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
}

.time-step {
    position: relative;
    padding: 20px 16px 14px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: rgba(17, 24, 39, 0.82);
}

.time-step:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -20px;
    top: 32px;
    width: 20px;
    height: 2px;
    background: #334155;
}

.step-dot {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #fff;
}

.cta {
    text-align: center;
    padding-bottom: 80px;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.24), rgba(6, 182, 212, 0.14));
}

.cta h2 {
    margin: 0 0 12px;
    font-size: 34px;
}

.muted {
    color: var(--text-secondary);
    font-size: 14px;
}

.ok { color: var(--ok); }
.warn { color: var(--warn); }

.form-wrap {
    max-width: 480px;
    margin: 72px auto;
}

input, button {
    width: 100%;
    padding: 11px 12px;
    margin: 8px 0;
    border-radius: 10px;
}

input {
    border: 1px solid #334155;
    background: #0f172a;
    color: #fff;
}

button {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #fff;
    border: none;
    cursor: pointer;
    font-weight: 700;
}

button.secondary {
    background: #334155;
}

footer {
    border-top: 1px solid rgba(51, 65, 85, 0.6);
    padding: 24px 0 36px;
    color: var(--text-secondary);
}

@media (max-width: 920px) {
    .hero-grid,
    .grid-3,
    .workflow-line,
    .steps-timeline {
        grid-template-columns: 1fr;
    }
    .wf-node:not(:last-child)::after,
    .time-step:not(:last-child)::after {
        content: none;
    }
    .site-nav .container {
        flex-direction: column;
        gap: 8px;
        padding-top: 10px;
        padding-bottom: 10px;
    }
}