/* ============================================================
   Scratch+ Toolkit · 科技玻璃风样式
   ============================================================ */

:root {
    /* 色彩 */
    --c-cyan:    #7af9ff;
    --c-blue:    #6aa6ff;
    --c-violet:  #b388ff;
    --c-pink:    #ff8ad6;
    --c-green:   #7affc4;
    --c-amber:   #ffd27a;

    --bg-0:      #050815;
    --bg-1:      #0a0f25;
    --bg-2:      #111634;

    --text-0:    #f4f7ff;
    --text-1:    #c8d0e8;
    --text-2:    #8a93b8;
    --text-3:    #5b6488;

    --line:      rgba(140, 170, 255, 0.18);
    --line-soft: rgba(140, 170, 255, 0.08);

    --glass-bg:     rgba(20, 28, 60, 0.42);
    --glass-bg-2:   rgba(30, 40, 80, 0.55);
    --glass-blur:   18px;
    --glass-sat:    140%;

    --shadow-1:  0 8px 32px rgba(0, 8, 40, 0.45);
    --shadow-2:  0 20px 60px rgba(0, 8, 40, 0.55);
    --glow-cyan:   0 0 24px rgba(122, 249, 255, 0.45);
    --glow-violet: 0 0 24px rgba(179, 136, 255, 0.45);

    --radius-s: 10px;
    --radius-m: 16px;
    --radius-l: 24px;
    --radius-xl: 32px;

    --ease:      cubic-bezier(.22, .61, .36, 1);
    --ease-back: cubic-bezier(.34, 1.56, .64, 1);
}

/* ===== 基础重置 ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg-0);
    color: var(--text-1);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    position: relative;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* ============================================================
   动态背景
   ============================================================ */
.bg-stage {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    background:
        radial-gradient(ellipse at 20% 0%, rgba(106, 166, 255, 0.18), transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(179, 136, 255, 0.18), transparent 50%),
        linear-gradient(180deg, var(--bg-0) 0%, var(--bg-1) 100%);
}

.aurora {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.55;
    mix-blend-mode: screen;
    will-change: transform;
}
.aurora-1 {
    width: 50vw; height: 50vw;
    left: -10vw; top: -10vw;
    background: radial-gradient(circle, var(--c-cyan), transparent 60%);
    animation: float-a 22s ease-in-out infinite;
}
.aurora-2 {
    width: 45vw; height: 45vw;
    right: -8vw; top: 10vh;
    background: radial-gradient(circle, var(--c-violet), transparent 60%);
    animation: float-b 26s ease-in-out infinite;
}
.aurora-3 {
    width: 60vw; height: 60vw;
    left: 20vw; bottom: -25vw;
    background: radial-gradient(circle, var(--c-blue), transparent 60%);
    animation: float-c 30s ease-in-out infinite;
}

@keyframes float-a {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50%      { transform: translate(15vw, 8vh) scale(1.15); }
}
@keyframes float-b {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50%      { transform: translate(-10vw, 12vh) scale(0.9); }
}
@keyframes float-c {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50%      { transform: translate(-8vw, -10vh) scale(1.1); }
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(140, 170, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(140, 170, 255, 0.05) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.noise {
    position: absolute;
    inset: 0;
    opacity: 0.04;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ============================================================
   玻璃材质
   ============================================================ */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
    border: 1px solid var(--line);
    box-shadow: var(--shadow-1), inset 0 1px 0 rgba(255, 255, 255, 0.06);
    position: relative;
}
.glass::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, rgba(122, 249, 255, 0.35), transparent 40%, transparent 60%, rgba(179, 136, 255, 0.35));
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
            mask-composite: exclude;
    pointer-events: none;
    opacity: 0.7;
}

/* ============================================================
   顶部导航
   ============================================================ */
.nav {
    position: fixed;
    top: 18px;
    left: 50%;
    transform: translateX(-50%);
    width: min(1280px, calc(100% - 32px));
    border-radius: var(--radius-l);
    z-index: 100;
    transition: top .4s var(--ease), box-shadow .4s var(--ease);
}
.nav-inner {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 12px 18px;
}

/* brand */
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-logo {
    display: grid;
    place-items: center;
    width: 44px; height: 44px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(122, 249, 255, 0.15), rgba(179, 136, 255, 0.15));
    border: 1px solid var(--line);
    box-shadow: var(--glow-cyan);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-title {
    font-family: "Orbitron", sans-serif;
    font-weight: 800;
    font-size: 18px;
    color: var(--text-0);
    letter-spacing: 0.5px;
}
.brand-plus {
    background: linear-gradient(135deg, var(--c-cyan), var(--c-violet));
    -webkit-background-clip: text;
            background-clip: text;
    -webkit-text-fill-color: transparent;
}
.brand-sub {
    font-size: 11px;
    color: var(--text-2);
    letter-spacing: 2px;
}

/* tabs */
.tabs {
    display: flex;
    align-items: center;
    gap: 4px;
    position: relative;
    flex: 1;
    justify-content: center;
}
.tab {
    position: relative;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 18px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-2);
    transition: color .35s var(--ease);
    white-space: nowrap;
}
.tab-dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--text-3);
    transition: all .35s var(--ease);
}
.tab:hover { color: var(--text-0); }
.tab.active { color: var(--text-0); }
.tab.active .tab-dot {
    background: var(--c-cyan);
    box-shadow: 0 0 10px var(--c-cyan);
}

.tab-glider {
    position: absolute;
    z-index: 1;
    top: 0; left: 0;
    height: 100%;
    border-radius: 999px;
    background: linear-gradient(135deg, rgba(122, 249, 255, 0.18), rgba(179, 136, 255, 0.18));
    border: 1px solid rgba(122, 249, 255, 0.35);
    box-shadow: 0 0 20px rgba(122, 249, 255, 0.25);
    transition: transform .45s var(--ease-back), width .45s var(--ease-back), opacity .35s var(--ease);
    opacity: 0;
    pointer-events: none;
}
.tab-glider.show { opacity: 1; }

/* nav actions */
.nav-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
}
.nav-toggle span {
    width: 22px; height: 2px;
    background: var(--text-1);
    border-radius: 2px;
    transition: all .35s var(--ease);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   按钮
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 500;
    transition: all .3s var(--ease);
    cursor: pointer;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}
.btn-lg { padding: 14px 28px; font-size: 15px; }

.btn-primary {
    background: linear-gradient(135deg, var(--c-cyan), var(--c-blue) 50%, var(--c-violet));
    color: #050815;
    font-weight: 700;
    box-shadow: 0 8px 24px rgba(106, 166, 255, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.4);
}
.btn-primary::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.4), transparent 70%);
    transform: translateX(-100%);
    transition: transform .6s var(--ease);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(122, 249, 255, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}
.btn-primary:hover::after { transform: translateX(100%); }

.btn-ghost {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--line);
    color: var(--text-0);
}
.btn-ghost:hover {
    border-color: rgba(122, 249, 255, 0.5);
    box-shadow: 0 0 20px rgba(122, 249, 255, 0.25);
    transform: translateY(-2px);
}

/* ============================================================
   主内容
   ============================================================ */
.main {
    padding: 130px 24px 80px;
    max-width: 1280px;
    margin: 0 auto;
}

.page { display: none; animation: pageIn .55s var(--ease) both; }
.page.active { display: block; }

@keyframes pageIn {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

.page-head { text-align: center; margin-bottom: 56px; }
.page-eyebrow {
    display: inline-block;
    font-family: "Orbitron", sans-serif;
    font-size: 12px;
    letter-spacing: 4px;
    color: var(--c-cyan);
    padding: 6px 14px;
    border: 1px solid rgba(122, 249, 255, 0.3);
    border-radius: 999px;
    background: rgba(122, 249, 255, 0.06);
    margin-bottom: 18px;
}
.page-title {
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 800;
    color: var(--text-0);
    line-height: 1.15;
    letter-spacing: -1px;
    margin-bottom: 14px;
}
.page-desc {
    font-size: 17px;
    color: var(--text-2);
    max-width: 620px;
    margin: 0 auto;
}

.grad-text {
    background: linear-gradient(135deg, var(--c-cyan), var(--c-blue) 50%, var(--c-violet));
    -webkit-background-clip: text;
            background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% auto;
    animation: gradShift 6s linear infinite;
}
@keyframes gradShift {
    0%   { background-position: 0% center; }
    100% { background-position: 200% center; }
}

/* ============================================================
   首页 Hero
   ============================================================ */
.hero { text-align: center; padding: 40px 0 30px; }

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 18px;
    border-radius: 999px;
    font-size: 13px;
    color: var(--text-1);
    margin-bottom: 28px;
}
.pulse {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--c-green);
    box-shadow: 0 0 0 0 rgba(122, 255, 196, 0.6);
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%   { box-shadow: 0 0 0 0 rgba(122, 255, 196, 0.6); }
    70%  { box-shadow: 0 0 0 12px rgba(122, 255, 196, 0); }
    100% { box-shadow: 0 0 0 0 rgba(122, 255, 196, 0); }
}

.hero-title {
    font-size: clamp(40px, 7vw, 78px);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -2px;
    color: var(--text-0);
    margin-bottom: 24px;
    text-shadow: 0 4px 30px rgba(106, 166, 255, 0.25);
}
.hero-desc {
    font-size: 18px;
    color: var(--text-2);
    max-width: 680px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 14px;
    margin-bottom: 70px;
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
    max-width: 980px;
    margin: 0 auto;
}
.stat {
    padding: 24px 18px;
    border-radius: var(--radius-m);
    text-align: center;
    transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.stat:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2), var(--glow-cyan);
}
.stat-num {
    font-family: "Orbitron", sans-serif;
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    background: linear-gradient(135deg, var(--c-cyan), var(--c-violet));
    -webkit-background-clip: text;
            background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}
.stat-num .unit { font-size: 0.55em; color: var(--text-2); -webkit-text-fill-color: var(--text-2); }
.stat-label {
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-2);
    letter-spacing: 1px;
}

/* preview band */
.preview-band { margin-top: 90px; text-align: center; }
.section-title {
    font-size: clamp(26px, 3.5vw, 36px);
    font-weight: 800;
    color: var(--text-0);
    margin-bottom: 8px;
}
.section-sub { color: var(--text-2); margin-bottom: 38px; }

.preview-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}
.preview-card {
    padding: 28px 22px;
    border-radius: var(--radius-m);
    text-align: left;
    transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.preview-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-2);
}
.preview-icon {
    width: 52px; height: 52px;
    border-radius: 14px;
    display: grid; place-items: center;
    margin-bottom: 16px;
    color: var(--c-cyan);
}
.preview-card h3 { color: var(--text-0); font-size: 18px; margin-bottom: 8px; }
.preview-card p { font-size: 14px; color: var(--text-2); line-height: 1.6; }

/* icon colors */
.ic-cyan   { background: rgba(122, 249, 255, 0.12); color: var(--c-cyan);   border: 1px solid rgba(122, 249, 255, 0.3); }
.ic-blue   { background: rgba(106, 166, 255, 0.12); color: var(--c-blue);   border: 1px solid rgba(106, 166, 255, 0.3); }
.ic-violet { background: rgba(179, 136, 255, 0.12); color: var(--c-violet); border: 1px solid rgba(179, 136, 255, 0.3); }
.ic-green  { background: rgba(122, 255, 196, 0.12); color: var(--c-green);  border: 1px solid rgba(122, 255, 196, 0.3); }
.ic-amber  { background: rgba(255, 210, 122, 0.12); color: var(--c-amber);  border: 1px solid rgba(255, 210, 122, 0.3); }
.ic-pink   { background: rgba(255, 138, 214, 0.12); color: var(--c-pink);   border: 1px solid rgba(255, 138, 214, 0.3); }

/* ============================================================
   功能特性
   ============================================================ */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.feature-card {
    padding: 28px 24px;
    border-radius: var(--radius-m);
    transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-2);
}
.feature-card h3 { color: var(--text-0); font-size: 19px; margin: 16px 0 10px; }
.feature-card p { color: var(--text-2); font-size: 14px; line-height: 1.65; }
.feature-icon {
    width: 56px; height: 56px;
    border-radius: 16px;
    display: grid; place-items: center;
}

.feature-lg {
    grid-column: span 2;
    grid-row: span 1;
}
.feature-tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--c-violet);
    background: rgba(179, 136, 255, 0.1);
    border: 1px solid rgba(179, 136, 255, 0.3);
    margin-bottom: 16px;
}
.feature-list {
    margin-top: 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.feature-list li {
    position: relative;
    padding-left: 22px;
    font-size: 13px;
    color: var(--text-1);
}
.feature-list li::before {
    content: "";
    position: absolute;
    left: 0; top: 8px;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--c-cyan);
    box-shadow: 0 0 8px var(--c-cyan);
}

/* ============================================================
   使用教程
   ============================================================ */
.steps { display: flex; flex-direction: column; gap: 24px; max-width: 1100px; margin: 0 auto; }
.step {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 30px;
    padding: 36px;
    border-radius: var(--radius-l);
    align-items: center;
}
.step-num {
    font-family: "Orbitron", sans-serif;
    font-size: 64px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--c-cyan), var(--c-violet));
    -webkit-background-clip: text;
            background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: 16px;
    opacity: 0.85;
}
.step-body h3 { color: var(--text-0); font-size: 24px; margin-bottom: 10px; }
.step-body p { color: var(--text-2); margin-bottom: 16px; line-height: 1.7; }

.step-code {
    font-family: "JetBrains Mono", Consolas, monospace;
    font-size: 13px;
    background: rgba(5, 8, 21, 0.5);
    border: 1px solid var(--line-soft);
    border-radius: 12px;
    padding: 14px 16px;
    color: var(--c-green);
    line-height: 1.8;
}
.step-code .cmt { color: var(--text-3); }

.check-list { display: flex; flex-wrap: wrap; gap: 8px; }
.check {
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 12px;
    color: var(--text-3);
    border: 1px solid var(--line-soft);
    background: rgba(20, 28, 60, 0.4);
}
.check.on {
    color: var(--c-cyan);
    border-color: rgba(122, 249, 255, 0.4);
    background: rgba(122, 249, 255, 0.08);
}

.export-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 8px;
}
.exp {
    padding: 14px;
    text-align: center;
    border-radius: 12px;
    font-weight: 600;
    color: var(--text-0);
    transition: transform .3s var(--ease);
}
.exp:hover { transform: translateY(-3px); box-shadow: var(--glow-cyan); }

/* mockups */
.browser-mock, .palette-mock, .terminal-mock {
    border-radius: var(--radius-m);
    overflow: hidden;
    padding: 0;
}
.bm-bar, .tm-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 14px;
    background: rgba(5, 8, 21, 0.4);
    border-bottom: 1px solid var(--line-soft);
}
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot.r { background: #ff5f57; }
.dot.y { background: #febc2e; }
.dot.g { background: #28c840; }
.bm-url {
    margin-left: 10px;
    padding: 4px 12px;
    border-radius: 6px;
    background: rgba(20, 28, 60, 0.6);
    font-size: 12px;
    color: var(--text-2);
    flex: 1;
}
.bm-body { padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.bm-block {
    height: 28px;
    border-radius: 6px;
    background: linear-gradient(90deg, rgba(122, 249, 255, 0.25), rgba(179, 136, 255, 0.25));
}
.bm-block:nth-child(2) { width: 75%; }
.bm-block:nth-child(3) { width: 50%; }

.palette-mock { padding: 18px; }
.pm-cat {
    font-size: 12px;
    color: var(--c-cyan);
    font-weight: 600;
    margin-bottom: 10px;
    letter-spacing: 1px;
}
.pm-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: 8px;
    background: rgba(20, 28, 60, 0.4);
    margin-bottom: 6px;
    font-size: 13px;
    color: var(--text-1);
}
.pm-block { width: 14px; height: 14px; border-radius: 4px; }
.pm-block.cyan   { background: var(--c-cyan); }
.pm-block.violet { background: var(--c-violet); }
.pm-block.blue   { background: var(--c-blue); }
.pm-block.green  { background: var(--c-green); }

.terminal-mock { padding: 0; }
.tm-body {
    padding: 16px;
    font-family: "JetBrains Mono", Consolas, monospace;
    font-size: 13px;
    line-height: 1.8;
}
.tm-line { color: var(--text-0); }
.tm-line .prompt { color: var(--c-cyan); margin-right: 8px; }
.tm-out { color: var(--c-green); padding-left: 16px; }

/* ============================================================
   关于
   ============================================================ */
.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 50px;
}
.about-card {
    padding: 28px 24px;
    border-radius: var(--radius-m);
    transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.about-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-2); }
.about-lg {
    grid-column: span 3;
}
.about-lg h3 { color: var(--text-0); font-size: 24px; margin-bottom: 14px; }
.about-lg p { color: var(--text-1); margin-bottom: 12px; line-height: 1.8; }
.about-meta {
    margin-top: 22px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    padding-top: 22px;
    border-top: 1px solid var(--line-soft);
}
.about-meta div { display: flex; flex-direction: column; gap: 4px; }
.about-meta span { font-size: 12px; color: var(--text-3); }
.about-meta strong { color: var(--text-0); font-size: 18px; }

.about-card h3 { color: var(--text-0); font-size: 18px; margin: 14px 0 8px; }
.about-card p { color: var(--text-2); font-size: 14px; line-height: 1.65; }
.about-icon {
    width: 50px; height: 50px;
    border-radius: 14px;
    display: grid; place-items: center;
}

.cta-band {
    padding: 50px;
    border-radius: var(--radius-l);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
    flex-wrap: wrap;
    background: linear-gradient(135deg, rgba(122, 249, 255, 0.08), rgba(179, 136, 255, 0.08)), var(--glass-bg);
}
.cta-text h2 { color: var(--text-0); font-size: 28px; margin-bottom: 8px; }
.cta-text p { color: var(--text-2); }
.cta-actions { display: flex; gap: 12px; }

/* ============================================================
   页脚
   ============================================================ */
.footer {
    margin-top: 80px;
    padding: 50px 24px 24px;
    border-top: 1px solid var(--line-soft);
    background: linear-gradient(180deg, transparent, rgba(5, 8, 21, 0.6));
}
.footer-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.4fr 2fr;
    gap: 40px;
    padding-bottom: 36px;
    border-bottom: 1px solid var(--line-soft);
}
.footer-brand .brand-title { font-size: 22px; }
.footer-brand p { color: var(--text-2); margin-top: 10px; font-size: 14px; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.footer-col h4 { color: var(--text-0); font-size: 14px; margin-bottom: 14px; }
.footer-col a {
    display: block;
    color: var(--text-2);
    font-size: 13px;
    padding: 5px 0;
    transition: color .3s var(--ease);
}
.footer-col a:hover { color: var(--c-cyan); }
.footer-bottom {
    max-width: 1280px;
    margin: 18px auto 0;
    display: flex;
    justify-content: space-between;
    color: var(--text-3);
    font-size: 12px;
    flex-wrap: wrap;
    gap: 8px;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
    .preview-grid,
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .feature-lg { grid-column: span 2; }
    .about-grid { grid-template-columns: repeat(2, 1fr); }
    .about-lg { grid-column: span 2; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
    .about-meta { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav { top: 10px; width: calc(100% - 20px); }
    .nav-inner { gap: 12px; padding: 10px 14px; flex-wrap: wrap; }
    .tabs {
        display: none;
        position: absolute;
        top: calc(100% + 8px);
        left: 0; right: 0;
        flex-direction: column;
        padding: 14px;
        border-radius: var(--radius-l);
        background: var(--glass-bg-2);
        backdrop-filter: blur(var(--glass-blur));
        border: 1px solid var(--line);
        gap: 6px;
    }
    .tabs.open { display: flex; }
    .tab { width: 100%; justify-content: flex-start; }
    .tab-glider { display: none; }
    .nav-toggle { display: flex; margin-left: auto; }
    .nav-actions .btn-ghost { display: none; }

    .main { padding: 110px 16px 60px; }
    .hero-cta { flex-direction: column; align-items: stretch; }
    .step { grid-template-columns: 1fr; padding: 24px; }
    .step-illu { order: -1; }
    .step-num { font-size: 48px; }
    .cta-band { flex-direction: column; text-align: center; padding: 36px 24px; }
    .footer-inner { grid-template-columns: 1fr; }
    .footer-cols { grid-template-columns: repeat(3, 1fr); }
    .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
    .preview-grid,
    .feature-grid,
    .about-grid { grid-template-columns: 1fr; }
    .feature-lg,
    .about-lg { grid-column: span 1; }
    .hero-stats { grid-template-columns: 1fr 1fr; }
    .about-meta { grid-template-columns: 1fr 1fr; }
    .export-grid { grid-template-columns: 1fr 1fr; }
    .brand-sub { display: none; }
    .footer-cols { grid-template-columns: 1fr; }
}

/* 减弱动画偏好 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}