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

:root {
    --blue-50: #EFF6FF;
    --blue-100: #DBEAFE;
    --blue-200: #BFDBFE;
    --blue-300: #93C5FD;
    --blue-400: #60A5FA;
    --blue-500: #3B82F6;
    --blue-600: #2563EB;
    --blue-700: #1D4ED8;
    --blue-800: #1E40AF;
    --warn-600: #DC2626;
    --bg-grad: linear-gradient(180deg, #F0F7FF 0%, #E8F1FC 50%, #F5FAFF 100%);
    --shadow-sm: 0 2px 8px rgba(59, 130, 246, 0.08);
    --shadow-md: 0 8px 24px rgba(59, 130, 246, 0.12);
    --shadow-lg: 0 16px 48px rgba(59, 130, 246, 0.16);
    --shadow-xl: 0 24px 72px rgba(59, 130, 246, 0.2);
    --neu-shadow-out: 8px 8px 16px #d1d9e6, -8px -8px 16px #ffffff;
    --neu-shadow-in: inset 4px 4px 8px #d1d9e6, inset -4px -4px 8px #ffffff;
}

html {
    scroll-behavior: smooth;
    scroll-snap-type: y mandatory;
    overflow-y: scroll;
}

body {
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-grad);
    color: #1E293B;
    overflow-x: hidden;
    line-height: 1.6;
}

::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--blue-50);
}
::-webkit-scrollbar-thumb {
    background: var(--blue-300);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--blue-400);
}

.floating-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    overflow: hidden;
}

.float-shape {
    position: absolute;
    border-radius: 24px;
    opacity: 0.5;
    animation: float 8s ease-in-out infinite;
}

.shape-1 {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--blue-200), var(--blue-100));
    top: 10%;
    left: 5%;
    border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
    box-shadow: var(--shadow-sm);
    animation-delay: 0s;
}

.shape-2 {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--blue-300), var(--blue-200));
    top: 25%;
    right: 8%;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    animation-delay: 1s;
}

.shape-3 {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--blue-100), #ffffff);
    top: 55%;
    left: 3%;
    border-radius: 24px;
    box-shadow: var(--shadow-sm);
    animation-delay: 2s;
}

.shape-4 {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--blue-400), var(--blue-300));
    top: 45%;
    right: 5%;
    border-radius: 40% 60% 30% 70% / 60% 40% 60% 40%;
    opacity: 0.4;
    box-shadow: var(--shadow-sm);
    animation-delay: 0.5s;
}

.shape-5 {
    width: 90px;
    height: 90px;
    background: linear-gradient(135deg, var(--blue-200), var(--blue-100));
    bottom: 20%;
    left: 10%;
    border-radius: 50%;
    opacity: 0.45;
    box-shadow: var(--shadow-sm);
    animation-delay: 1.5s;
}

.shape-6 {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #ffffff, var(--blue-100));
    bottom: 35%;
    right: 12%;
    border-radius: 20px;
    box-shadow: var(--shadow-sm);
    animation-delay: 2.5s;
}

.shape-7 {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--blue-300), var(--blue-200));
    top: 70%;
    right: 20%;
    border-radius: 50%;
    opacity: 0.5;
    box-shadow: var(--shadow-sm);
    animation-delay: 3s;
}

.shape-8 {
    width: 110px;
    height: 110px;
    background: linear-gradient(135deg, var(--blue-100), #ffffff);
    bottom: 10%;
    left: 40%;
    border-radius: 60% 40% 30% 70% / 50% 60% 40% 50%;
    opacity: 0.4;
    box-shadow: var(--shadow-sm);
    animation-delay: 1.8s;
}

.shape-9 {
    width: 55px;
    height: 55px;
    background: linear-gradient(135deg, var(--blue-200), var(--blue-100));
    top: 18%;
    left: 22%;
    border-radius: 50%;
    opacity: 0.42;
    box-shadow: var(--shadow-sm);
    animation-delay: 0.6s;
}

.shape-10 {
    width: 75px;
    height: 75px;
    background: linear-gradient(135deg, #ffffff, var(--blue-200));
    top: 62%;
    left: 24%;
    border-radius: 18px;
    transform: rotate(18deg);
    opacity: 0.46;
    box-shadow: var(--shadow-sm);
    animation-delay: 2.2s;
}

.shape-11 {
    width: 95px;
    height: 95px;
    background: linear-gradient(135deg, var(--blue-300), var(--blue-200));
    top: 30%;
    right: 22%;
    border-radius: 40% 60% 50% 50% / 50% 40% 60% 50%;
    opacity: 0.32;
    box-shadow: var(--shadow-sm);
    animation-delay: 1.2s;
}

.shape-12 {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--blue-400), var(--blue-300));
    bottom: 24%;
    right: 30%;
    border-radius: 50%;
    opacity: 0.4;
    box-shadow: var(--shadow-sm);
    animation-delay: 2.8s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    25% {
        transform: translateY(-20px) rotate(5deg);
    }
    50% {
        transform: translateY(-10px) rotate(-3deg);
    }
    75% {
        transform: translateY(-25px) rotate(3deg);
    }
}

.layer {
    position: relative;
    min-height: 100vh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    scroll-snap-align: start;
    z-index: 2;
    padding: 60px 40px;
    opacity: 0;
    transform: translateY(80px);
    transition: opacity 1s cubic-bezier(0.22, 1, 0.36, 1),
                transform 1s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.layer.leaving-up {
    opacity: 0;
    transform: translateY(-80px);
}

.layer.leaving-down {
    opacity: 0;
    transform: translateY(80px);
}

.layer-content {
    position: relative;
    max-width: 1200px;
    width: 100%;
    z-index: 3;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.layer-0 {
    background: radial-gradient(ellipse at center, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
}

.hero-brand {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 28px;
    margin-top: -10px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid rgba(191, 219, 254, 0.85);
    border-radius: 999px;
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow-sm);
    opacity: 0;
    animation: badgeIn 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.4s forwards;
    transform: translateY(-10px);
}

@keyframes badgeIn {
    to { opacity: 1; transform: translateY(0); }
}

.hero-badge-dot {
    width: 7px;
    height: 7px;
    background: var(--blue-500);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.16);
    animation: badgePulse 1.8s ease-in-out infinite;
}

@keyframes badgePulse {
    0%, 100% { box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.16); }
    50%      { box-shadow: 0 0 0 7px rgba(59, 130, 246, 0.06); }
}

.hero-badge-text {
    font-size: 13px;
    font-weight: 600;
    color: var(--blue-700);
    letter-spacing: 0.8px;
}

.hero-title {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(80px, 13vw, 150px);
    font-weight: 900;
    letter-spacing: -3px;
    line-height: 1;
    display: flex;
    gap: 4px;
    color: var(--blue-700);
}

.hero-title-main {
    filter: drop-shadow(0 14px 32px rgba(59, 130, 246, 0.18));
}

.hero-title .letter {
    display: inline-block;
    opacity: 0;
    transform: translateY(50px) scale(0.78);
    transition: all 0.72s cubic-bezier(0.22, 1, 0.36, 1);
    background: linear-gradient(135deg, var(--blue-800) 0%, var(--blue-600) 45%, var(--blue-500) 75%, var(--blue-400) 100%);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--blue-700);
    cursor: default;
}

.layer-0.visible .hero-title .letter {
    opacity: 1;
    transform: translateY(0) scale(1);
    animation: gradientShift 5s ease-in-out infinite;
}

.layer-0.visible .hero-title .letter:nth-child(1) { transition-delay: 0.14s; animation-delay: 0.9s; }
.layer-0.visible .hero-title .letter:nth-child(2) { transition-delay: 0.28s; animation-delay: 1.04s; }
.layer-0.visible .hero-title .letter:nth-child(3) { transition-delay: 0.42s; animation-delay: 1.18s; }
.layer-0.visible .hero-title .letter:nth-child(4) { transition-delay: 0.56s; animation-delay: 1.32s; }
.layer-0.visible .hero-title .letter:nth-child(5) { transition-delay: 0.70s; animation-delay: 1.46s; }

.hero-title .letter:hover {
    transform: translateY(-6px) scale(1.05) !important;
    filter: drop-shadow(0 14px 24px rgba(59, 130, 246, 0.4));
}

.letter-c {
    position: relative;
}
.letter-c::after {
    content: '';
    position: absolute;
    top: -10px;
    right: -14px;
    width: 24px;
    height: 24px;
    background: radial-gradient(circle, var(--blue-400), var(--blue-300));
    border-radius: 50%;
    animation: twinkle 2s ease-in-out infinite;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.4; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.3); }
}

.hero-subtitle {
    font-size: clamp(17px, 2.3vw, 24px);
    font-weight: 500;
    color: var(--blue-600);
    letter-spacing: 2.4px;
    opacity: 0;
    animation: fadeUp 0.9s ease 1.7s forwards;
}

.hero-subtitle-main {
    margin-top: -4px;
}

@keyframes fadeUp {
    to { opacity: 1; }
}

.hero-quick-row {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 6px;
    opacity: 0;
    animation: fadeUp 0.9s ease 1.9s forwards;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 24px;
    border-radius: 999px;
    font-size: 14.5px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    font-family: inherit;
    transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    white-space: nowrap;
}

.hero-btn-ghost {
    background: rgba(255, 255, 255, 0.85);
    color: var(--blue-700);
    border: 1px solid rgba(191, 219, 254, 0.9);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(6px);
}

.hero-btn-ghost:hover {
    background: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--blue-300);
}

.hero-btn-solid {
    background: linear-gradient(135deg, var(--blue-600), var(--blue-500));
    color: white;
    box-shadow: 0 10px 26px rgba(59, 130, 246, 0.32);
}

.hero-btn-solid:hover {
    background: linear-gradient(135deg, var(--blue-700), var(--blue-600));
    transform: translateY(-3px);
    box-shadow: 0 14px 34px rgba(37, 99, 235, 0.42);
}

.hero-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 2px;
    opacity: 0;
    animation: fadeUp 0.9s ease 2.1s forwards;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 14px;
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(219, 234, 254, 0.95);
    border-radius: 14px;
    font-size: 13px;
    font-weight: 600;
    color: var(--blue-700);
    backdrop-filter: blur(6px);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}
.hero-tag svg { flex-shrink: 0; display: block; }

.hero-tag:hover {
    background: white;
    transform: translateY(-2px);
    border-color: var(--blue-200);
    box-shadow: var(--shadow-md);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    animation: fadeUp 1s ease 2s forwards;
    opacity: 0;
}

.scroll-arrow {
    width: 30px;
    height: 50px;
    border: 3px solid var(--blue-400);
    border-radius: 20px;
    position: relative;
}
.scroll-arrow::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 5px;
    height: 10px;
    background: var(--blue-500);
    border-radius: 3px;
    animation: scrollMove 1.8s ease-in-out infinite;
}

@keyframes scrollMove {
    0% { top: 8px; opacity: 1; }
    80% { top: 28px; opacity: 0; }
    100% { top: 8px; opacity: 0; }
}

.scroll-text {
    font-size: 13px;
    color: var(--blue-500);
    letter-spacing: 1px;
}

.layer-title {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(36px, 5vw, 52px);
    font-weight: 800;
    text-align: center;
    background: linear-gradient(135deg, var(--blue-800), var(--blue-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.layer-desc {
    text-align: center;
    font-size: clamp(15px, 1.5vw, 18px);
    color: #64748B;
    margin-bottom: 60px;
    font-weight: 400;
}

.layer-1 .text-block {
    max-width: 900px;
    margin: 0 auto;
}

.animated-name {
    display: flex;
    justify-content: center;
    gap: 2px;
    margin-bottom: 24px;
    padding: 0 10px;
}

.animated-name .name-char {
    display: inline-block;
    font-family: 'Poppins', sans-serif;
    font-weight: 900;
    font-size: clamp(48px, 7vw, 80px);
    background: linear-gradient(135deg, var(--blue-700), var(--blue-400), var(--blue-500));
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0;
    transform: translateY(30px) scale(0.7);
    filter: blur(6px);
    transition: all 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.layer-1.visible .name-char {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
    animation: gradientShift 4s ease infinite;
}

.layer-1.visible .name-char:nth-child(1) { transition-delay: 0.20s; animation-delay: 1s; }
.layer-1.visible .name-char:nth-child(2) { transition-delay: 0.35s; animation-delay: 1.15s; }
.layer-1.visible .name-char:nth-child(3) { transition-delay: 0.50s; animation-delay: 1.30s; }
.layer-1.visible .name-char:nth-child(4) { transition-delay: 0.65s; animation-delay: 1.45s; }
.layer-1.visible .name-char:nth-child(5) { transition-delay: 0.80s; animation-delay: 1.60s; }

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.animated-name .name-char:hover {
    transform: translateY(-10px) scale(1.1) rotate(-3deg);
    filter: drop-shadow(0 10px 20px rgba(59, 130, 246, 0.3));
}

.author-tag {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 40px;
    font-size: 15px;
    color: #475569;
}

.author-link {
    color: var(--blue-600);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 2px solid transparent;
    transition: all 0.3s;
}
.author-link:hover {
    border-bottom-color: var(--blue-400);
}

.opensource-badge {
    background: linear-gradient(135deg, var(--blue-100), #ffffff);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    color: var(--blue-700);
    box-shadow: var(--shadow-sm);
}

.intro-card {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 28px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.intro-text {
    font-size: clamp(16px, 1.6vw, 19px);
    line-height: 1.9;
    color: #334155;
    text-align: center;
    margin-bottom: 40px;
}

.highlight-blue {
    color: var(--blue-700);
    font-weight: 700;
    background: linear-gradient(120deg, transparent 0%, var(--blue-100) 50%, transparent 100%);
    padding: 0 4px;
    border-radius: 4px;
}

.highlight-warn {
    color: var(--warn-600);
    font-weight: 700;
    background: linear-gradient(120deg, transparent 0%, #FEE2E2 50%, transparent 100%);
    padding: 0 4px;
    border-radius: 4px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.feature-item {
    background: linear-gradient(145deg, #ffffff, #F0F7FF);
    padding: 24px;
    border-radius: 20px;
    box-shadow: 6px 6px 16px rgba(59, 130, 246, 0.08),
                -4px -4px 12px rgba(255, 255, 255, 0.9);
    transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.feature-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(59, 130, 246, 0.15);
}

.feature-icon {
    font-size: 36px;
    margin-bottom: 12px;
    display: block;
}

.feature-item h4 {
    font-family: 'Poppins', sans-serif;
    font-size: 17px;
    font-weight: 700;
    color: var(--blue-800);
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 14px;
    color: #64748B;
    line-height: 1.7;
}

.architecture-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 4px;
    width: 100%;
}

.architecture-container-wide {
    max-width: 1008px;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
    padding: 0 10px;
}

.arch-svg {
    width: 100%;
    height: auto;
    display: block;
    overflow: visible;
}

.arch-svg-large {
    max-width: 936px;
    width: 100%;
    overflow: visible;
}

.core-big {
    transform-box: fill-box;
    transform-origin: center;
}

.core-big > g {
    transform-box: fill-box;
    transform-origin: 690px 430px;
    animation: coreBigPulse 3.6s ease-in-out infinite;
}

@keyframes coreBigPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.014); }
}

.layer-2 .layer-title {
    margin-top: 44px;
}

.layer-2 .layer-desc {
    margin-bottom: 28px;
}

.pulseRing {
    transform-box: fill-box;
    transform-origin: 690px 430px;
    transform: scale(0.92);
    opacity: 0;
}

.layer-2.visible .pulseRing.pr-a {
    animation: pulseExpandA 3s ease-out infinite;
}
.layer-2.visible .pulseRing.pr-b {
    animation: pulseExpandB 3s ease-out infinite 0.7s;
}
.layer-2.visible .pulseRing.pr-c {
    animation: pulseExpandC 3s ease-out infinite 1.4s;
}

@keyframes pulseExpandA {
    0%   { transform: scale(0.92); opacity: 0.65; }
    100% { transform: scale(1.55); opacity: 0; }
}
@keyframes pulseExpandB {
    0%   { transform: scale(0.92); opacity: 0.5; }
    100% { transform: scale(1.75); opacity: 0; }
}
@keyframes pulseExpandC {
    0%   { transform: scale(0.92); opacity: 0.4; }
    100% { transform: scale(1.95); opacity: 0; }
}

.api-node-big {
    transform-box: fill-box;
    transform-origin: center;
    transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
    cursor: pointer;
}

.api-node-big:hover {
    transform: translateY(-6px) scale(1.025);
}

.layer-2.visible .api-node-big {
    animation: nodeFloat 4.2s ease-in-out infinite;
}

.layer-2.visible .node-http       { animation-delay: 0s; }
.layer-2.visible .node-mqtt       { animation-delay: 0.35s; }
.layer-2.visible .node-gateway    { animation-delay: 0.18s; }
.layer-2.visible .node-smarthome  { animation-delay: 0.52s; }
.layer-2.visible .node-pc         { animation-delay: 0.7s; }
.layer-2.visible .node-llm        { animation-delay: 0.9s; }
.layer-2.visible .node-docs       { animation-delay: 1.1s; }
.layer-2.visible .node-tasks      { animation-delay: 0.45s; }

@keyframes nodeFloat {
    0%, 100% { translate: 0 0; }
    50%      { translate: 0 -5px; }
}

.security-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
    max-width: 1100px;
    margin: 0 auto;
}

.sec-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 28px;
    padding: 40px 32px;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.9);
    transition: all 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
    overflow: hidden;
}

.sec-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--blue-400), var(--blue-600), var(--blue-400));
    background-size: 200% 100%;
    animation: headerFlow 3s linear infinite;
}

@keyframes headerFlow {
    to { background-position: 200% 0; }
}

.sec-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.sec-icon-wrap {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    border-radius: 24px;
    background: linear-gradient(145deg, #ffffff, var(--blue-50));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 6px 6px 14px rgba(59, 130, 246, 0.1),
                -4px -4px 10px rgba(255, 255, 255, 0.95);
}

.sec-icon {
    width: 56px;
    height: 56px;
}

.sec-title {
    font-family: 'Poppins', sans-serif;
    font-size: 24px;
    font-weight: 700;
    color: var(--blue-800);
    text-align: center;
    margin-bottom: 16px;
}

.sec-tag-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.sec-tag {
    background: var(--blue-50);
    color: var(--blue-700);
    padding: 5px 12px;
    border-radius: 12px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--blue-100);
}

.sec-desc {
    font-size: 15px;
    color: #475569;
    text-align: center;
    line-height: 1.8;
}

.scenes-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
    max-width: 1200px;
    margin: 0 auto;
}

.scene-card {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 32px;
    padding: 32px;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.95);
    transition: all 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.scene-card:hover {
    transform: translateY(-8px) scale(1.01);
    box-shadow: var(--shadow-xl);
}

.scene-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.scene-emoji {
    font-size: 32px;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(145deg, #ffffff, var(--blue-50));
    border-radius: 18px;
    box-shadow: 5px 5px 12px rgba(59, 130, 246, 0.1),
                -3px -3px 8px rgba(255, 255, 255, 0.95);
}

.scene-name {
    font-family: 'Poppins', sans-serif;
    font-size: 20px;
    font-weight: 700;
    color: var(--blue-800);
}

.scene-visual {
    background: linear-gradient(160deg, var(--blue-50) 0%, #ffffff 100%);
    border-radius: 24px;
    padding: 28px;
    margin-bottom: 24px;
    min-height: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 4px 4px 10px rgba(59, 130, 246, 0.06),
                inset -3px -3px 8px rgba(255, 255, 255, 0.9);
}

.house-shape {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.house-roof {
    width: 180px;
    height: 0;
    border-left: 90px solid transparent;
    border-right: 90px solid transparent;
    border-bottom: 50px solid var(--blue-400);
    position: relative;
    filter: drop-shadow(0 4px 8px rgba(59, 130, 246, 0.2));
}

.house-roof::after {
    content: '🏠';
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 20px;
}

.house-body {
    width: 170px;
    height: 130px;
    background: linear-gradient(180deg, #ffffff, var(--blue-50));
    border: 3px solid var(--blue-200);
    border-top: none;
    border-radius: 0 0 16px 16px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    box-shadow: var(--shadow-md);
}

.room {
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.room-living {
    border-bottom: 2px dashed var(--blue-100);
    padding-bottom: 8px;
}

.device {
    font-size: 22px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border-radius: 10px;
    box-shadow: 2px 2px 6px rgba(0,0,0,0.08),
                -1px -1px 4px rgba(255,255,255,1);
    animation: deviceFloat 3s ease-in-out infinite;
    cursor: pointer;
    transition: transform 0.3s;
}

.device:hover {
    transform: scale(1.15) rotate(-5deg);
}

.device-light { animation-delay: 0s; }
.device-tv { animation-delay: 0.5s; }
.device-ac { animation-delay: 1s; }
.device-curtain { animation-delay: 0.3s; }
.device-speaker { animation-delay: 0.8s; }

@keyframes deviceFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

.hub-indicator {
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--blue-500), var(--blue-700));
    color: white;
    padding: 4px 14px;
    border-radius: 16px;
    font-size: 11px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
}

.hub-dot {
    width: 7px;
    height: 7px;
    background: #4ADE80;
    border-radius: 50%;
    animation: hubBlink 1.5s ease-in-out infinite;
}

@keyframes hubBlink {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.6); }
    50% { opacity: 0.6; box-shadow: 0 0 0 6px rgba(74, 222, 128, 0); }
}

.pc-shape {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.pc-monitor {
    background: linear-gradient(145deg, #e8edf5, #ffffff);
    border-radius: 16px;
    padding: 12px;
    box-shadow: var(--neu-shadow-out);
    border: 2px solid rgba(255, 255, 255, 0.6);
}

.pc-screen {
    width: 220px;
    height: 150px;
    background: linear-gradient(180deg, #1e293b, #334155);
    border-radius: 10px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.window-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.dot.red { background: #EF4444; }
.dot.yellow { background: #F59E0B; }
.dot.green { background: #10B981; }

.win-title {
    color: rgba(255,255,255,0.6);
    font-size: 10px;
    margin-left: 8px;
    font-weight: 500;
}

.chat-line {
    font-size: 11px;
    padding: 6px 10px;
    border-radius: 10px;
    max-width: 90%;
    line-height: 1.4;
}

.chat-user {
    align-self: flex-end;
    background: var(--blue-500);
    color: white;
    border-bottom-right-radius: 2px;
    animation: chatSlide 0.4s ease-out;
}

.chat-bot {
    align-self: flex-start;
    background: rgba(255,255,255,0.12);
    color: #e2e8f0;
    border-bottom-left-radius: 2px;
    backdrop-filter: blur(4px);
    animation: chatSlide 0.4s ease-out;
}

@keyframes chatSlide {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.pc-stand {
    width: 30px;
    height: 20px;
    background: linear-gradient(180deg, #cbd5e1, #94a3b8);
    margin-top: -2px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.pc-base {
    width: 100px;
    height: 8px;
    background: linear-gradient(145deg, #cbd5e1, #94a3b8);
    border-radius: 0 0 12px 12px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.12);
}

.comm-grid {
    display: grid;
    grid-template-columns: 60px 30px 60px;
    grid-template-rows: 60px 30px 60px 30px 60px;
    gap: 4px;
    align-items: center;
    justify-items: center;
    position: relative;
}

.comm-device {
    width: 58px;
    height: 58px;
    background: linear-gradient(145deg, #ffffff, var(--blue-50));
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    box-shadow: 5px 5px 12px rgba(59, 130, 246, 0.12),
                -3px -3px 8px rgba(255, 255, 255, 0.95);
    transition: all 0.3s;
    cursor: pointer;
    animation: deviceFloat 3.5s ease-in-out infinite;
}

.comm-device:hover {
    transform: scale(1.12);
}

.comm-phone { grid-area: 1 / 1 / 2 / 2; }
.comm-watch { grid-area: 1 / 3 / 2 / 4; animation-delay: 0.4s; }
.comm-tablet { grid-area: 5 / 1 / 6 / 2; animation-delay: 0.8s; }
.comm-iot { grid-area: 5 / 3 / 6 / 4; animation-delay: 1.2s; }

.comm-line {
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--blue-200), var(--blue-400), var(--blue-200));
    background-size: 200% 100%;
    border-radius: 2px;
    animation: lineFlow 2s linear infinite;
}
.comm-line.vertical {
    width: 3px;
    height: 100%;
    background: linear-gradient(180deg, var(--blue-200), var(--blue-400), var(--blue-200));
    background-size: 100% 200%;
}

.comm-line:nth-of-type(1) { grid-area: 1 / 2 / 2 / 3; }
.comm-line:nth-of-type(2) { grid-area: 2 / 1 / 3 / 2; }
.comm-line:nth-of-type(3) { grid-area: 2 / 3 / 3 / 4; }
.comm-line:nth-of-type(4) { grid-area: 4 / 1 / 5 / 2; }
.comm-line:nth-of-type(5) { grid-area: 4 / 3 / 5 / 4; }
.comm-line:nth-of-type(6) { grid-area: 5 / 2 / 6 / 3; }

@keyframes lineFlow {
    to { background-position: 200% 0; }
}

.comm-center {
    grid-area: 3 / 1 / 4 / 4;
    display: flex;
    align-items: center;
    justify-content: center;
}

.comm-center-inner {
    background: linear-gradient(135deg, var(--blue-500), var(--blue-700));
    color: white;
    padding: 14px 24px;
    border-radius: 20px;
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 1px;
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
    position: relative;
}

.comm-center-inner::before,
.comm-center-inner::after {
    content: '';
    position: absolute;
    inset: -4px;
    border: 2px solid var(--blue-300);
    border-radius: 24px;
    opacity: 0.5;
    animation: centerRipple 2.5s ease-out infinite;
}
.comm-center-inner::after {
    animation-delay: 1s;
}

@keyframes centerRipple {
    0% { inset: -4px; opacity: 0.5; }
    100% { inset: -16px; opacity: 0; }
}

.scene-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.scene-list li {
    font-size: 14px;
    color: #475569;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: var(--blue-50);
    border-radius: 12px;
    transition: all 0.3s;
}

.scene-list li:hover {
    background: var(--blue-100);
    transform: translateX(4px);
}

.list-dot {
    width: 8px;
    height: 8px;
    background: linear-gradient(135deg, var(--blue-400), var(--blue-600));
    border-radius: 50%;
    flex-shrink: 0;
}

.layer-5 {
    background: radial-gradient(ellipse at center, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
}

.thanks-wrap {
    text-align: center;
    max-width: 720px;
    margin: 0 auto;
}

.thanks-hearts {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
    height: 50px;
}

.heart {
    font-size: 30px;
    opacity: 0;
    transform: translateY(20px) scale(0.5);
}

.layer-5.visible .heart {
    animation: heartPop 0.8s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.layer-5.visible .h1 { animation-delay: 0.2s; }
.layer-5.visible .h2 { animation-delay: 0.4s; }
.layer-5.visible .h3 { animation-delay: 0.6s; }

@keyframes heartPop {
    0% { opacity: 0; transform: translateY(20px) scale(0.5); }
    60% { opacity: 1; transform: translateY(-10px) scale(1.3); }
    100% { opacity: 1; transform: translateY(0) scale(1); }
}

.heart {
    animation: heartBeat 1.6s ease-in-out infinite 1s;
}

.h2 { animation-delay: 0.2s, 1.2s; }
.h3 { animation-delay: 0.4s, 1.4s; }

@keyframes heartBeat {
    0%, 100% { transform: scale(1); }
    25% { transform: scale(1.15); }
    50% { transform: scale(1); }
    75% { transform: scale(1.1); }
}

.thanks-title {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(40px, 6vw, 68px);
    font-weight: 900;
    margin-bottom: 12px;
    display: flex;
    justify-content: center;
    gap: 4px;
}

.thanks-word {
    display: inline-block;
    background: linear-gradient(135deg, var(--blue-700), var(--blue-500), var(--blue-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0;
    transform: translateY(40px) rotate(-10deg);
    transition: all 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.layer-5.visible .thanks-word {
    opacity: 1;
    transform: translateY(0) rotate(0);
}

.layer-5.visible .thanks-word:nth-child(1) { transition-delay: 0.30s; }
.layer-5.visible .thanks-word:nth-child(2) { transition-delay: 0.50s; }
.layer-5.visible .thanks-word:nth-child(3) { transition-delay: 0.70s; }
.layer-5.visible .thanks-word:nth-child(4) { transition-delay: 0.90s; }

.thanks-subtitle {
    font-size: clamp(16px, 1.8vw, 20px);
    color: var(--blue-500);
    letter-spacing: 2px;
    font-weight: 500;
    margin-bottom: 40px;
    opacity: 0;
}

.layer-5.visible .thanks-subtitle {
    animation: fadeUp 0.8s ease 0.8s forwards;
}

.thanks-card {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 32px;
    padding: 44px;
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.9);
    margin-bottom: 36px;
}

.thanks-text {
    font-size: clamp(15px, 1.5vw, 17px);
    color: #475569;
    line-height: 2;
    margin-bottom: 16px;
}
.thanks-text:last-of-type {
    margin-bottom: 28px;
}

.github-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, #1E293B, #334155);
    color: white;
    padding: 14px 32px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: all 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: 0 8px 24px rgba(30, 41, 59, 0.3);
}

.github-btn:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 14px 36px rgba(30, 41, 59, 0.4);
    background: linear-gradient(135deg, #0f172a, #1e293b);
}

.footer-sign {
    color: #64748B;
    font-size: 14px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.footer-sign a {
    color: var(--blue-600);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
}
.footer-sign a:hover {
    color: var(--blue-700);
    text-decoration: underline;
}

.mini-text {
    font-size: 12px;
    letter-spacing: 1px;
    color: #94a3b8;
}

@media (max-width: 900px) {
    html {
        scroll-snap-type: none;
    }
    
    .layer {
        padding: 60px 24px;
        min-height: auto;
    }
    
    .intro-card {
        padding: 28px 20px;
    }
    
    .thanks-card {
        padding: 32px 20px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 600px) {
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .logo-container {
        width: 300px;
        max-width: 92vw;
        height: auto;
        padding: 20px 10px;
    }
    
    .hero-title {
        gap: 0px;
    }
    
    .scene-card {
        padding: 24px 20px;
    }
    
    .scene-visual {
        padding: 20px;
    }
    
    .sec-card {
        padding: 32px 24px;
    }
    
    .github-btn {
        padding: 12px 24px;
        font-size: 14px;
    }
}

/* =========================
   Layer 0 · Floating Nav FABs
   ========================= */
.layer-0 .layer-content { position: relative; }

.floating-nav-fab {
    position: absolute;
    z-index: 14;
    width: 68px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    user-select: none;
    animation: fabFloat 9s ease-in-out infinite;
}
.floating-nav-fab .fab-halo {
    position: absolute;
    inset: -12px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(147,197,253,0.45), rgba(96,165,250,0.12) 55%, rgba(59,130,246,0) 72%);
    opacity: 0.85;
    transition: opacity 0.35s ease, transform 0.35s ease;
}
.floating-nav-fab .fab-core {
    position: relative;
    width: 60px;
    height: 60px;
    border-radius: 22px;
    background: linear-gradient(145deg, #ffffff, #EFF6FF);
    border: 1.4px solid rgba(191,219,254,0.95);
    box-shadow: 0 14px 36px rgba(59,130,246,0.18), 0 4px 10px rgba(29,78,216,0.07);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transition: transform 0.4s cubic-bezier(0.22,1,0.36,1),
                box-shadow 0.4s cubic-bezier(0.22,1,0.36,1),
                background 0.4s ease,
                border-color 0.4s ease;
}
.floating-nav-fab svg { opacity: 0.82; transition: opacity 0.35s ease, transform 0.35s ease; }

.fab-tooltip {
    position: absolute;
    top: -46px;
    left: 50%;
    transform: translateX(-50%) translateY(8px) scale(0.94);
    padding: 7px 16px;
    border-radius: 999px;
    background: rgba(255,255,255,0.92);
    border: 1px solid rgba(147,197,253,0.9);
    box-shadow: 0 10px 28px rgba(59,130,246,0.16);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.45s ease, transform 0.45s cubic-bezier(0.22,1,0.36,1);
    white-space: nowrap;
}
.fab-tooltip .fab-label {
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 13.5px;
    letter-spacing: 2.8px;
    background: linear-gradient(135deg, #1E3A8A, #2563EB);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.fab-tooltip::after {
    content: '';
    position: absolute;
    bottom: -5px; left: 50%;
    width: 10px; height: 10px;
    transform: translateX(-50%) rotate(45deg);
    background: rgba(255,255,255,0.92);
    border-right: 1px solid rgba(147,197,253,0.9);
    border-bottom: 1px solid rgba(147,197,253,0.9);
}

.floating-nav-fab:hover { animation-play-state: paused; }
.floating-nav-fab:hover .fab-core {
    transform: scale(1.08);
    background: linear-gradient(145deg, #EFF6FF, #DBEAFE);
    border-color: #60A5FA;
    box-shadow: 0 18px 48px rgba(59,130,246,0.28), 0 6px 14px rgba(29,78,216,0.1);
}
.floating-nav-fab:hover svg { opacity: 1; transform: scale(1.06); }
.floating-nav-fab:hover .fab-halo {
    opacity: 1;
    transform: scale(1.12);
}
.floating-nav-fab:hover .fab-tooltip {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
}

.fab-intro  { top: 8%;   left: 6%;  animation-delay: 0.4s; }
.fab-arch   { top: 22%;  right: 7%; animation-delay: 1.1s; }
.fab-safe   { bottom: 26%; left: 5%;  animation-delay: 1.8s; }
.fab-scene  { top: 46%;  right: 4%; animation-delay: 0.8s; }
.fab-thanks { bottom: 12%; right: 22%; animation-delay: 1.5s; }

@keyframes fabFloat {
    0%, 100% { transform: translate3d(0, 0, 0) rotate(0deg); }
    28%      { transform: translate3d(6px, -16px, 0) rotate(2deg); }
    55%      { transform: translate3d(-4px, -8px, 0) rotate(-1.5deg); }
    78%      { transform: translate3d(4px, -20px, 0) rotate(1deg); }
}

/* =========================
   Layer 1 · Redesign (Left/Right)
   ========================= */
.layer-1-content {
    display: grid !important;
    grid-template-columns: 1.05fr 1fr;
    gap: 56px;
    align-items: center;
    width: min(1240px, 100%);
    padding: 40px 16px;
}
.l1-side { display: flex; flex-direction: column; align-items: flex-start; text-align: left; }
.l1-side > svg {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 60px rgba(96, 165, 250, 0.55)) drop-shadow(0 8px 28px rgba(147, 197, 253, 0.45));
}
.l1-kicker {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 3.2px;
    color: #60A5FA;
    margin-bottom: 18px;
    padding-left: 2px;
}
.l1-title { text-align: left !important; margin-bottom: 10px !important; font-size: clamp(58px, 8.4vw, 96px); }
.l1-author {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 20px;
    border-radius: 24px;
    background: rgba(255,255,255,0.78);
    border: 1px solid rgba(191,219,254,0.9);
    box-shadow: 0 12px 32px rgba(59,130,246,0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    margin: 18px 0 22px;
}
.author-avatar { flex-shrink: 0; }
.author-meta .author-line1 {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 14.5px;
    color: #1E3A8A;
    margin-bottom: 6px;
}
.author-link {
    color: #2563EB;
    text-decoration: none;
    font-weight: 700;
    transition: color 0.25s ease;
}
.author-link:hover { color: #1D4ED8; text-decoration: underline; }
.author-line2 { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
}
.chip-blue {
    background: linear-gradient(135deg, #DBEAFE, #EFF6FF);
    color: #1D4ED8;
    border: 1px solid rgba(147,197,253,0.85);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.chip-blue svg { flex-shrink: 0; display: block; }
.chip-ghost {
    background: #ffffff;
    color: #3B82F6;
    border: 1px dashed #93C5FD;
}

.l1-lead {
    font-family: 'Inter', sans-serif;
    font-size: clamp(15px, 1.45vw, 18px);
    line-height: 1.95;
    color: #334155;
    margin-bottom: 30px;
    max-width: 540px;
}
.hl-ink {
    color: #1D4ED8;
    font-weight: 700;
    background: linear-gradient(120deg, transparent 0%, #EFF6FF 50%, transparent 100%);
    padding: 0 5px;
    border-radius: 6px;
}
.l1-stats {
    display: flex;
    align-items: stretch;
    padding: 20px 26px;
    border-radius: 28px;
    background: rgba(255,255,255,0.82);
    border: 1px solid rgba(191,219,254,0.85);
    box-shadow: 0 14px 34px rgba(59,130,246,0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}
.stat { flex: 1; display: flex; flex-direction: column; gap: 6px; padding: 4px 14px; }
.stat-num {
    font-family: 'Poppins', sans-serif;
    font-weight: 900;
    font-size: clamp(26px, 3vw, 36px);
    background: linear-gradient(135deg, #1E3A8A, #3B82F6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}
.stat-cap {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    font-size: 12.5px;
    color: #64748B;
    letter-spacing: 0.4px;
}
.stat-split {
    width: 1px;
    background: linear-gradient(to bottom, transparent, #BFDBFE, transparent);
    margin: 4px 0;
}

.l1-orbit {
    width: 100%;
    max-width: 520px;
    display: block;
    filter: drop-shadow(0 30px 60px rgba(59,130,246,0.18));
}
.l1-orbit-ring {
    transform-origin: 260px 260px;
    transform-box: fill-box;
    animation: l1Orbit 24s linear infinite;
}
.l1-orbit-ring.l1-r2 { animation-duration: 28s; animation-direction: reverse; }
.l1-orbit-ring.l1-r3 { animation-duration: 32s; }
.l1-orbit-ring.l1-r4 { animation-duration: 36s; animation-direction: reverse; }
.layer-1:not(.visible) .l1-orbit-ring { animation-play-state: paused; opacity: 0.55; }

@keyframes l1Orbit {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}
.l1-orbit-ring > g { animation: l1RingFix 24s linear infinite; }
.l1-orbit-ring.l1-r2 > g { animation-name: l1RingFixR; animation-duration: 28s; }
.l1-orbit-ring.l1-r3 > g { animation-duration: 32s; }
.l1-orbit-ring.l1-r4 > g { animation-name: l1RingFixR; animation-duration: 36s; }

@keyframes l1RingFix  { from { transform: rotate(0deg);   } to { transform: rotate(-360deg); } }
@keyframes l1RingFixR { from { transform: rotate(0deg);   } to { transform: rotate(360deg);  } }

.l1-star-node {
    transform-origin: center;
    animation: starTwinkle 5.6s ease-in-out infinite;
    animation-delay: var(--delay, 0s);
}
.l1-star-node:nth-child(2) { animation-delay: 0.9s; }
.l1-star-node:nth-child(3) { animation-delay: 1.8s; }
.l1-star-node:nth-child(4) { animation-delay: 2.7s; }
@keyframes starTwinkle {
    0%, 100% { opacity: 1;    transform: scale(1);     }
    50%      { opacity: 0.9;  transform: scale(1.035); }
}

@media (max-width: 980px) {
    .layer-1-content { grid-template-columns: 1fr; gap: 32px; padding-top: 80px; }
    .l1-side { align-items: center; text-align: center; }
    .l1-title { text-align: center !important; }
    .l1-stats { width: 100%; justify-content: center; }
}
@media (max-width: 720px) {
    .floating-nav-fab { width: 56px; height: 56px; }
    .floating-nav-fab .fab-core { width: 50px; height: 50px; }
    .floating-nav-fab svg { width: 26px; height: 26px; }
}

/* =========================
   Layer 3 · Security Redesign
   ========================= */
.l3-head { text-align: center; margin-bottom: 18px; }
.l3-kicker {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 3.2px;
    color: #60A5FA;
    margin-bottom: 10px;
}
.l3-title { margin-bottom: 8px !important; }
.l3-sub {
    font-family: 'Inter', sans-serif;
    font-size: clamp(14.5px, 1.4vw, 17px);
    color: #64748B;
    margin: 0;
}
.l3-stage { position: relative; width: min(1140px, 100%); padding-bottom: 16px; }
.l3-visual { width: 100%; display: block; }

.l3-chip {
    transform-origin: center;
    transform-box: fill-box;
    animation: chipBreathe 5s ease-in-out infinite;
}
.l3-chip-right { animation-delay: 1.2s; }
.l3-chip-bottom { animation-delay: 0.6s; }
@keyframes chipBreathe {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-6px); }
}
.layer-3:not(.visible) .l3-chip { animation-play-state: paused; }

.l3-note {
    position: absolute;
    max-width: 280px;
    padding: 14px 18px 14px 48px;
    border-radius: 18px;
    background: rgba(255,255,255,0.88);
    border: 1px solid rgba(191,219,254,0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 14px 34px rgba(59,130,246,0.14);
    font-family: 'Inter', sans-serif;
    font-size: 13.5px;
    color: #334155;
    line-height: 1.7;
}
.l3-note span {
    position: absolute;
    left: 14px; top: 14px;
    width: 26px; height: 26px;
    border-radius: 50%;
    display: grid; place-items: center;
    background: linear-gradient(135deg, #60A5FA, #2563EB);
    color: #ffffff;
    font-family: 'Poppins', sans-serif;
    font-weight: 800;
    font-size: 12px;
}
.l3-note b { color: #1D4ED8; font-weight: 700; }
.l3-note-a { top: 2%;   left: -2%; }
.l3-note-b { top: 2%;   right: -2%; }
.l3-note-c { bottom: 2%; left: 50%; transform: translateX(-50%); max-width: 460px; padding-left: 54px; }
.l3-note-under {
    position: static;
    transform: none;
    max-width: 620px;
    width: 100%;
    margin: -64px auto 0;
    padding-left: 54px;
    text-align: center;
}

@media (max-width: 1040px) {
    .l3-note-a, .l3-note-b, .l3-note-c {
        position: static;
        transform: none;
        max-width: 100%;
        margin: 12px 0 0;
    }
}

/* =========================
   Layer 4 · Scenes Redesign
   ========================= */
.l4-head { text-align: center; margin-bottom: 26px; }
.l4-kicker {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 3.2px;
    color: #60A5FA;
    margin-bottom: 10px;
}
.l4-title { margin-bottom: 8px !important; }
.l4-sub {
    font-family: 'Inter', sans-serif;
    font-size: clamp(14.5px, 1.4vw, 17px);
    color: #64748B;
    margin: 0;
}
.l4-stage {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
    width: min(1240px, 100%);
}

.scene-panel {
    position: relative;
    padding: 22px 20px 18px;
    border-radius: 32px;
    background: linear-gradient(180deg, rgba(255,255,255,0.95), rgba(239,246,255,0.75));
    border: 1px solid rgba(191,219,254,0.92);
    box-shadow: 0 22px 56px rgba(59,130,246,0.14),
                0 6px 14px rgba(29,78,216,0.06);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform 0.5s cubic-bezier(0.22,1,0.36,1),
                box-shadow 0.5s cubic-bezier(0.22,1,0.36,1),
                border-color 0.4s ease;
    display: flex;
    flex-direction: column;
}
.scene-panel:hover {
    transform: translateY(-10px) scale(1.01);
    border-color: #60A5FA;
    box-shadow: 0 32px 70px rgba(59,130,246,0.22),
                0 10px 22px rgba(29,78,216,0.1);
}
.scene-tag {
    position: absolute;
    top: -14px; left: 22px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 14px;
    border-radius: 999px;
    background: linear-gradient(135deg, #1E3A8A, #3B82F6);
    color: #ffffff;
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 12px;
    letter-spacing: 1.4px;
    box-shadow: 0 10px 26px rgba(29,78,216,0.3);
}
.scene-tag svg { color: #ffffff; flex-shrink: 0; }

.scene-svg {
    width: 100%;
    height: auto;
    display: block;
    margin: 10px 0 16px;
}
.scene-points {
    display: flex;
    flex-direction: column;
    gap: 9px;
    padding-top: 6px;
    border-top: 1px dashed #BFDBFE;
}
.sp {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Inter', sans-serif;
    font-size: 13.2px;
    color: #334155;
    line-height: 1.6;
    padding: 2px 0;
}
.sp-dot {
    flex-shrink: 0;
    width: 8px; height: 8px;
    border-radius: 50%;
    background: #3B82F6;
    box-shadow: 0 0 0 4px rgba(147,197,253,0.35);
}

@media (max-width: 1024px) {
    .l4-stage { grid-template-columns: 1fr; gap: 36px; max-width: 460px; }
}

@media (max-width: 720px) {
    .l1-stats { flex-direction: column; align-items: stretch; gap: 10px; }
    .stat-split { width: 100%; height: 1px; margin: 0; }
    .stat { padding: 8px 4px; text-align: center; align-items: center; }
}