/* =============================================================
   TTBOX-STYLE.CSS  v8
   科技 · 大气 · 简约  —  Apple / Tesla 风格黑白极简
   ============================================================= */

/* ============ 全局 ============ */
body.ttbox-theme {
    background: #000;
    color: #f5f5f7;
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    -webkit-font-smoothing: antialiased;
}

body.ttbox-theme * { box-sizing: border-box; }

body.ttbox-theme h1,
body.ttbox-theme h2,
body.ttbox-theme h3,
body.ttbox-theme h4 {
    color: #f5f5f7;
    font-weight: 600;
    letter-spacing: -0.02em;
}

body.ttbox-theme p {
    color: rgba(255,255,255,0.55);
    line-height: 1.7;
}

body.ttbox-theme a { color: #f5f5f7; text-decoration: none; }

/* ============ 容器 ============ */
.tt-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 48px;
}

/* ============ 导航 ============ */
body.ttbox-theme #navigation-section {
    background: rgba(0,0,0,0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 9999;
    transition: all 0.3s ease;
}

body.ttbox-theme #navigation-section .row {
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
}

body.ttbox-theme #navigation-section .row > [class*="col-"] {
    padding: 0;
    margin: 0;
}

body.ttbox-theme #navigation-section .row > .col-lg-2 {
    flex: 0 0 auto;
    width: auto;
}

body.ttbox-theme #navigation-section .row > .col-lg-10 {
    flex: 1 1 auto;
    width: auto;
}

body.ttbox-theme #navigation-section .offset-2 { margin-left: 0; }

body.ttbox-theme #navigation-section .logo img {
    height: 24px;
    transition: opacity 0.3s;
}

body.ttbox-theme #navigation-section .logo img:hover { opacity: 0.7; }

body.ttbox-theme #navigation-section .navigation ul {
    display: flex;
    gap: 28px;
    align-items: center;
    justify-content: flex-end;
    list-style: none;
    margin: 0;
    padding: 0;
}

body.ttbox-theme #navigation-section .navigation ul li { display: inline-block; }

body.ttbox-theme .navigation ul li a {
    color: rgba(255,255,255,0.65);
    font-size: 12px;
    font-weight: 400;
    letter-spacing: 0;
    transition: color 0.3s;
    padding: 0;
    line-height: 52px;
    display: block;
}

body.ttbox-theme .navigation ul li a:hover,
body.ttbox-theme .navigation ul li.current a {
    color: #fff;
}

body.ttbox-theme .navigation ul li a::after { display: none; }

/* ============ HERO ============ */
.tt-hero {
    position: relative;
    min-height: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: #000;
    overflow: hidden;
    padding: 120px 0 100px;
}

/* 分栏 Hero — 产品页左右布局 */
.tt-hero--split {
    text-align: left;
    padding: 120px 0 100px;
    min-height: auto;
}

.tt-hero--split .tt-hero-content {
    display: block;
}

.tt-hero--split .row {
    flex-direction: row !important;
    align-items: center;
    justify-content: space-between;
}

.tt-hero--split .row > .col-lg-6 {
    flex: 0 0 50% !important;
    max-width: 50% !important;
    width: 50% !important;
}

.tt-hero--split .tt-hero-tag {
    margin-left: 0;
}

.tt-hero--split .tt-hero-lead {
    margin-left: 0;
    margin-right: 0;
    font-size: clamp(13px, 1.2vw, 15px) !important;
    line-height: 1.6 !important;
    margin-bottom: 32px !important;
}

.tt-hero--split .tt-hero-btns {
    justify-content: flex-start;
}

.tt-hero--split h1 {
    text-align: left;
    font-size: clamp(28px, 3.5vw, 44px) !important;
    letter-spacing: 0.06em !important;
    line-height: 1.2 !important;
    margin-bottom: 20px !important;
}

/* EVE 变体：图左文右 */
.tt-hero--reverse .row {
    flex-direction: row-reverse !important;
}

.tt-hero--reverse {
    text-align: right;
}

.tt-hero--reverse .tt-hero-tag {
    margin-left: auto;
    margin-right: 0;
}

.tt-hero--reverse .tt-hero-lead {
    margin-left: auto;
    margin-right: 0;
}

.tt-hero--reverse .tt-hero-btns {
    justify-content: flex-end;
}

.tt-hero--reverse h1 {
    text-align: right;
}

.tt-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 50% at 50% 40%, rgba(255,255,255,0.04) 0%, transparent 70%),
        radial-gradient(circle at 20% 80%, rgba(100,100,255,0.03) 0%, transparent 40%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.02) 0%, transparent 40%);
    pointer-events: none;
}

.tt-hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 80px 80px;
    pointer-events: none;
    mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
}

.tt-hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
}

.tt-hero .row {
    justify-content: center;
    flex-direction: column;
    align-items: center;
}

.tt-hero .row > .col-lg-6 {
    flex: 0 0 100%;
    max-width: 100%;
    width: 100%;
}

.tt-hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 100px;
    font-size: 11px;
    letter-spacing: 2px;
    color: rgba(255,255,255,0.5);
    margin-bottom: 32px;
    text-transform: uppercase;
    background: rgba(255,255,255,0.03);
    backdrop-filter: blur(8px);
}

.tt-hero-tag .dot {
    width: 6px;
    height: 6px;
    background: #2ecc71;
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(46,204,113,0.6);
    animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

body.ttbox-theme .tt-hero h1 {
    font-size: clamp(48px, 7vw, 80px);
    font-weight: 700;
    line-height: 1.08;
    letter-spacing: 0.12em;
    margin-bottom: 24px;
    color: #f5f5f7;
}

body.ttbox-theme .tt-hero h1 .accent {
    background: linear-gradient(135deg, rgba(255,255,255,0.6) 0%, rgba(255,255,255,0.25) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 500;
}

body.ttbox-theme .tt-hero-lead {
    font-size: clamp(15px, 1.8vw, 19px);
    line-height: 1.7;
    color: rgba(255,255,255,0.45);
    max-width: 640px;
    margin: 0 auto 40px;
    font-weight: 400;
}

.tt-hero-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Hero 连接路径动画 */
.hero-connection {
    margin-top: 64px;
    width: 100%;
}

.hero-connection .device-tabs {
    margin-bottom: 24px;
}

.hero-connection .ekm-animation,
.hero-connection .eve-animation {
    height: 340px;
}

/* Hero 设备图 */
.tt-hero .device-stage {
    margin-top: 56px;
    perspective: 1500px;
    height: 360px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.device-float {
    position: relative;
    width: 400px;
    height: 340px;
    transform-style: preserve-3d;
    animation: float-3d 8s ease-in-out infinite;
}

@keyframes float-3d {
    0%, 100% { transform: rotateY(-6deg) rotateX(2deg) translateY(0); }
    50% { transform: rotateY(6deg) rotateX(-2deg) translateY(-16px); }
}

.device-float img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 30px 60px rgba(255,255,255,0.08));
}

.device-shadow {
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 20px;
    background: radial-gradient(ellipse, rgba(255,255,255,0.06) 0%, transparent 70%);
    filter: blur(10px);
    animation: shadow-pulse 8s ease-in-out infinite;
}

@keyframes shadow-pulse {
    0%, 100% { width: 60%; opacity: 0.6; }
    50% { width: 40%; opacity: 0.25; }
}

.device-orbit { display: none; }

/* ============ 按钮 ============ */
body.ttbox-theme .tt-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 13px;
    font-weight: 500;
    border: none;
    border-radius: 980px;
    background: #f5f5f7;
    color: #000;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    letter-spacing: 0;
}

body.ttbox-theme .tt-btn:hover {
    background: #fff;
    transform: scale(1.02);
}

body.ttbox-theme .tt-btn-outline {
    background: transparent;
    color: #f5f5f7;
    border: 1px solid rgba(255,255,255,0.2);
}

body.ttbox-theme .tt-btn-outline:hover {
    border-color: rgba(255,255,255,0.5);
    background: rgba(255,255,255,0.06);
    color: #fff;
    transform: scale(1.02);
}

.tt-btn .arrow { transition: transform 0.3s; }
.tt-btn:hover .arrow { transform: translateX(3px); }

/* ============ 章节通用 ============ */
.tt-section {
    padding: 120px 0;
    position: relative;
}

.tt-section.dark-bg {
    background: #000;
}

.tt-section:not(.dark-bg) {
    background: #000;
}

/* 章节之间用微妙的线分隔 */
.tt-section + .tt-section {
    border-top: 1px solid rgba(255,255,255,0.06);
}

/* 去掉旧的 section-index 编号样式 */
.section-index {
    display: none;
}

.section-title-xl {
    font-size: clamp(24px, 3.2vw, 40px);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    color: #f5f5f7;
    text-align: center;
}

.section-subtitle {
    font-size: clamp(15px, 1.6vw, 18px);
    color: rgba(255,255,255,0.4);
    font-weight: 400;
    line-height: 1.65;
    max-width: 600px;
    margin: 0 auto 64px;
    text-align: center;
}

/* ============ 统计条 ============ */
.stat-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    padding: 48px 0;
    border-top: 1px solid rgba(255,255,255,0.06);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.stat-bar-item {
    text-align: center;
    flex: 1;
    position: relative;
    padding: 0 24px;
}

.stat-bar-item:not(:last-child)::after {
    content: "";
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.08);
}

.stat-bar-value {
    font-size: clamp(28px, 3.5vw, 44px);
    font-weight: 700;
    color: #f5f5f7;
    letter-spacing: -0.02em;
    margin-bottom: 6px;
    font-variant-numeric: tabular-nums;
}

.stat-bar-label {
    font-size: 11px;
    color: rgba(255,255,255,0.35);
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* ============ 产品阵列 ============ */
.product-lineup {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.product-card {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 20px;
    padding: 40px 32px;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    text-decoration: none;
    display: block;
}

.product-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(255,255,255,0.04) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.4s;
}

.product-card:hover::before { opacity: 1; }

.product-card:hover {
    border-color: rgba(255,255,255,0.12);
    transform: translateY(-4px);
}

.product-card-tag {
    display: none;
}

.product-card h4 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
    color: #f5f5f7;
    letter-spacing: -0.02em;
}

.product-card p {
    font-size: 14px;
    color: rgba(255,255,255,0.4);
    line-height: 1.6;
    margin-bottom: 20px;
}

.product-card-specs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.product-card-spec {
    font-size: 11px;
    color: rgba(255,255,255,0.5);
    padding: 4px 10px;
    background: rgba(255,255,255,0.05);
    border-radius: 4px;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.product-card-arrow {
    position: absolute;
    bottom: 32px;
    right: 32px;
    font-size: 20px;
    color: rgba(255,255,255,0.15);
    transition: all 0.3s;
}

.product-card:hover .product-card-arrow {
    color: rgba(255,255,255,0.6);
    transform: translateX(4px);
}

/* ============ 能力数字 ============ */
.capability-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: rgba(255,255,255,0.06);
    border-radius: 16px;
    overflow: hidden;
}

.capability-item {
    padding: 48px 28px;
    text-align: center;
    background: rgba(255,255,255,0.02);
    transition: background 0.4s;
}

.capability-item:hover {
    background: rgba(255,255,255,0.04);
}

.capability-num {
    font-size: clamp(40px, 5vw, 64px);
    font-weight: 700;
    color: #f5f5f7;
    line-height: 1;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
    font-variant-numeric: tabular-nums;
}

.capability-label {
    font-size: 12px;
    color: rgba(255,255,255,0.35);
    letter-spacing: 0.5px;
    line-height: 1.4;
}

/* ============ 信任卡片 ============ */
.trust-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.trust-card {
    background: rgba(255,255,255,0.02);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 20px;
    padding: 40px 28px;
    transition: all 0.4s;
}

.trust-card:hover {
    border-color: rgba(255,255,255,0.1);
    background: rgba(255,255,255,0.03);
}

.trust-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(255,255,255,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    transition: all 0.3s;
}

.trust-card:hover .trust-icon {
    background: rgba(255,255,255,0.08);
}

.trust-icon svg {
    width: 22px;
    height: 22px;
    stroke: rgba(255,255,255,0.7);
    fill: none;
    stroke-width: 1.5;
}

.trust-card h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #f5f5f7;
}

.trust-card p {
    font-size: 14px;
    color: rgba(255,255,255,0.4);
    line-height: 1.65;
    margin-bottom: 24px;
}

.trust-metric {
    display: flex;
    align-items: baseline;
    gap: 8px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.06);
}

.trust-metric-value {
    font-size: 28px;
    font-weight: 700;
    color: #f5f5f7;
    letter-spacing: -0.02em;
}

.trust-metric-label {
    font-size: 11px;
    color: rgba(255,255,255,0.3);
    letter-spacing: 0.5px;
}

/* ============ 连接路径动画 ============ */
.ekm-animation,
.eve-animation,
.eco-animation,
.net-animation {
    position: relative;
    width: 100%;
    height: 380px;
    background: rgba(255,255,255,0.02);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 20px;
    overflow: hidden;
}

.ekm-animation svg,
.eve-animation svg,
.eco-animation svg,
.net-animation svg {
    width: 100%;
    height: 100%;
    display: block;
}

/* SVG 内元素在暗色背景上的颜色覆盖 */
.endpoint-box {
    fill: rgba(255,255,255,0.03);
    stroke: rgba(255,255,255,0.12);
    stroke-width: 1;
}

.endpoint-label {
    fill: rgba(255,255,255,0.6);
    font-size: 10px;
    letter-spacing: 1px;
}

.ekm-device {
    fill: rgba(255,255,255,0.05);
    stroke: rgba(255,255,255,0.2);
    stroke-width: 1.5;
}

.ekm-usb {
    fill: rgba(255,255,255,0.08);
    stroke: rgba(255,255,255,0.15);
    stroke-width: 1;
}

.ekm-label {
    fill: rgba(255,255,255,0.7);
    font-size: 10px;
    letter-spacing: 1px;
}

.eve-device {
    fill: rgba(255,255,255,0.04);
    stroke: rgba(255,255,255,0.15);
    stroke-width: 1.5;
}

.eve-cable {
    stroke: rgba(255,255,255,0.12);
    stroke-width: 1.5;
    fill: none;
}

.connection-line {
    stroke: rgba(255,255,255,0.08);
    stroke-width: 1;
    fill: none;
    stroke-dasharray: 4 4;
}

.aes-particle {
    fill: rgba(255,255,255,0.8);
    filter: drop-shadow(0 0 6px rgba(255,255,255,0.4));
}

.data-particle {
    fill: rgba(255,255,255,0.6);
}

.aes-label {
    fill: rgba(255,255,255,0.3);
    font-size: 9px;
}

/* SVG grid pattern override */
.ekm-animation svg pattern path,
.eve-animation svg pattern path,
.eco-animation svg pattern path,
.net-animation svg pattern path {
    stroke: rgba(255,255,255,0.04) !important;
}

/* ============ Tab 切换 ============ */
.device-tabs {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-bottom: 40px;
    background: rgba(255,255,255,0.04);
    border-radius: 12px;
    padding: 4px;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.device-tab {
    padding: 10px 24px;
    font-size: 13px;
    color: rgba(255,255,255,0.4);
    cursor: pointer;
    border: none;
    background: transparent;
    border-radius: 8px;
    transition: all 0.3s;
    font-weight: 500;
    letter-spacing: 0;
}

.device-tab:hover { color: rgba(255,255,255,0.7); }

.device-tab.active {
    color: #f5f5f7;
    background: rgba(255,255,255,0.08);
}

.device-panel { display: none; }
.device-panel.active {
    display: block;
    animation: fade-in 0.5s ease;
}

@keyframes fade-in {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============ 使用步骤 ============ */
.usage-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.usage-step {
    padding: 40px 28px;
    background: rgba(255,255,255,0.02);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 20px;
    transition: all 0.4s;
}

.usage-step:hover {
    background: rgba(255,255,255,0.04);
    border-color: rgba(255,255,255,0.1);
}

.usage-step-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: rgba(255,255,255,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: rgba(255,255,255,0.5);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0;
}

.usage-step-num {
    font-size: 11px;
    color: rgba(255,255,255,0.25);
    letter-spacing: 2px;
    margin-bottom: 16px;
    font-weight: 500;
}

.usage-step h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #f5f5f7;
}

.usage-step p {
    font-size: 14px;
    color: rgba(255,255,255,0.4);
    line-height: 1.65;
}

/* ============ 接口卡片 ============ */
.interface-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.interface-card {
    padding: 36px 28px;
    background: rgba(255,255,255,0.02);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 20px;
    transition: all 0.4s;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.interface-card:hover {
    background: rgba(255,255,255,0.04);
    border-color: rgba(255,255,255,0.1);
}

.interface-tag {
    display: none;
}

.interface-card h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #f5f5f7;
}

.interface-card p {
    font-size: 14px;
    color: rgba(255,255,255,0.4);
    line-height: 1.65;
}

.interface-card .tt-btn {
    margin-top: auto;
}

/* ============ CTA ============ */
.cta-section {
    position: relative;
    padding: 120px 0;
    text-align: center;
    background: #000;
    overflow: hidden;
}

.cta-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 50% 60% at 50% 50%, rgba(255,255,255,0.03) 0%, transparent 70%);
    pointer-events: none;
}

.cta-section h2 {
    font-size: clamp(28px, 3.5vw, 44px);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    color: #f5f5f7;
    position: relative;
    z-index: 1;
}

.cta-section p {
    font-size: 16px;
    color: rgba(255,255,255,0.4);
    margin-bottom: 36px;
    position: relative;
    z-index: 1;
}

.cta-section .tt-btn {
    position: relative;
    z-index: 1;
}

/* ============ 页脚 ============ */
body.ttbox-theme #footer-section {
    background: #000;
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 40px 0;
}

body.ttbox-theme .copy-right-text,
body.ttbox-theme .copy-right-text a {
    color: rgba(255,255,255,0.25);
    font-size: 12px;
    letter-spacing: 0;
    transition: color 0.3s;
}

body.ttbox-theme .copy-right-text a:hover { color: rgba(255,255,255,0.6); }

/* ============ 滚动揭示 ============ */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* ============ Bootstrap row 重置 ============ */
body.ttbox-theme .tt-container .row,
body.ttbox-theme .tt-hero .row { margin: 0; }

body.ttbox-theme .tt-container .row > [class*="col-"],
body.ttbox-theme .tt-hero .row > [class*="col-"] {
    padding: 0;
    position: relative;
}

body.ttbox-theme .tt-section .row {
    display: flex;
    flex-wrap: wrap;
}

body.ttbox-theme .tt-section .row > .col-lg-4 {
    flex: 0 0 33.3333%;
    max-width: 33.3333%;
    padding: 0;
}

body.ttbox-theme .tt-section .row > .col-lg-12 {
    flex: 0 0 100%;
    max-width: 100%;
}

/* ============ 响应式 ============ */
@media (max-width: 992px) {
    .tt-container { padding: 0 24px; }
    .tt-section { padding: 80px 0; }
    .tt-hero { min-height: auto; padding: 100px 0 60px; }
    .tt-hero--split { padding: 100px 0 60px; }
    .tt-hero--split .row { flex-direction: column !important; }
    .tt-hero--split .row > .col-lg-6 {
        flex: 0 0 100% !important;
        max-width: 100% !important;
        width: 100% !important;
    }
    .tt-hero--split .tt-hero-btns,
    .tt-hero--reverse .tt-hero-btns { justify-content: center; }
    .tt-hero--reverse h1,
    .tt-hero--reverse .tt-hero-tag,
    .tt-hero--reverse .tt-hero-lead { text-align: center; margin-left: auto; margin-right: auto; }
    .hero-connection { margin-top: 40px; }
    .hero-connection .ekm-animation,
    .hero-connection .eve-animation { height: 260px; }
    .capability-grid { grid-template-columns: repeat(2, 1fr); }
    .trust-grid { grid-template-columns: 1fr; }
    .usage-steps { grid-template-columns: 1fr; }
    .interface-grid { grid-template-columns: 1fr; }
    .product-lineup { grid-template-columns: 1fr; }
    .stat-bar { flex-wrap: wrap; gap: 24px; padding: 32px 0; }
    .stat-bar-item { flex: 0 0 calc(33% - 16px); }
    .stat-bar-item:not(:last-child)::after { display: none; }
    .device-float { width: 280px; height: 240px; }
    .tt-hero .device-stage { height: 280px; margin-top: 40px; }
    .ekm-animation, .eve-animation, .eco-animation, .net-animation { height: 280px; }
    body.ttbox-theme .tt-section .row > .col-lg-4 {
        flex: 0 0 100%;
        max-width: 100%;
        padding: 0;
    }
    body.ttbox-theme .tt-section .row > .col-lg-4 + .col-lg-4 {
        margin-top: 20px;
    }
}

@media (max-width: 768px) {
    .tt-container { padding: 0 20px; }
    .tt-hero h1 { font-size: 32px; }
    .tt-hero-lead { font-size: 15px; }
    .capability-grid { grid-template-columns: 1fr 1fr; }
    .stat-bar-item { flex: 0 0 calc(50% - 12px); }
    .tt-btn { padding: 12px 24px; font-size: 14px; }
    .device-tabs { width: 100%; }
    .device-tab { flex: 1; text-align: center; font-size: 12px; padding: 10px 12px; }
    .hero-connection .ekm-animation,
    .hero-connection .eve-animation { height: 220px; }
}

@media (max-width: 480px) {
    .capability-grid { grid-template-columns: 1fr; }
    .stat-bar-item { flex: 0 0 100%; }
}

/* ============ 移动端导航 ============ */
@media (max-width: 991px) {
    body.ttbox-theme #navigation-section {
        display: block !important;
    }

    body.ttbox-theme #navigation-section .row {
        flex-wrap: wrap;
        gap: 0;
        height: auto;
        min-height: 52px;
    }

    body.ttbox-theme #navigation-section .row > .col-lg-10 {
        flex: 1 1 100%;
        order: 3;
    }

    body.ttbox-theme #navigation-section .navigation ul {
        justify-content: flex-start;
        gap: 16px;
        padding: 8px 0 12px;
        flex-wrap: wrap;
    }

    body.ttbox-theme .navigation ul li a {
        font-size: 12px;
        line-height: 1.5;
    }
}