/* ==========================================================
   永远怀念 Digital Memorial Infrastructure
   V4.0 Production Edition
   style.css
   Part 01
========================================================== */

/* 全局 CSS 变量：主题颜色、间距、圆角、阴影、动画时长 */
:root {

    --primary: #1a1a2e;
    --primary-light: #2a2a3e;
    --secondary: #3d3d3d;

    --text: #3d3d3d;
    --text-light: #9a8a7a;

    --border: #e8e0d5;
    --border-light: #f5f1eb;

    --background: #FFFFFF;
    --background-soft: #fcfaf7;
    --background-blue: #f5f1eb;

    --blue: #8B7355;          /* gold accent — unified with pc.css */
    --gold: #8B7355;
    --gold-light: #a0866b;
    --gold-dark: #6d5a44;
    --blue-light: #f5f1eb;

    --success: #6b8f5e;
    --warning: #b8860b;
    --danger: #8b3a3a;

    --border-medium: #d8cfc0;
    --border-strong: #c8bca8;

    --radius-xs: 8px;
    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 24px;

    --shadow-xs: 0 2px 8px rgba(26, 26, 46, .05);
    --shadow-sm: 0 8px 24px rgba(26, 26, 46, .07);
    --shadow-md: 0 20px 60px rgba(26, 26, 46, .10);
    --shadow-lg: 0 30px 80px rgba(26, 26, 46, .14);

    --transition: .28s cubic-bezier(.4, 0, .2, 1);

    --container: 1280px;

    --font-heading: "KaiTi", "STKaiti", "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;

}

/* 全局重置：清除默认外边距，统一盒模型 */
* {

    margin: 0;
    padding: 0;
    box-sizing: border-box;

}

html {

    scroll-behavior: smooth;

}

body {

    font-family: "Inter",
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;

    font-size: 16px;

    line-height: 1.8;

    color: var(--secondary);

    background: #fff;

    -webkit-font-smoothing: antialiased;

    text-rendering: optimizeLegibility;

}

img {

    display: block;

    max-width: 100%;

}

svg {

    display: block;

    max-width: 100%;

}

a {

    text-decoration: none;

    color: inherit;

    transition: var(--transition);

}

button {

    font-family: inherit;

}

ul {

    list-style: none;

}

.yyhn-container {

    width: var(--container);

    margin: auto;

    padding: 0 10px;

}

section {

    position: relative;

    padding: 110px 0;

    overflow: hidden;

}

/* ==========================================================
Section Head
========================================================== */

.section-head {

    /*max-width: 900px;*/

    margin: 0 auto 72px;

    text-align: center;

}

.section-head h2 {

    font-size: 48px;

    font-weight: 800;

    line-height: 1.28;

    letter-spacing: .3px;

    color: var(--primary);

    margin-bottom: 24px;

}

.section-head p {

    font-size: 19px;
    text-indent : 2em;
    line-height: 1.95;
    text-align: left;

    color: var(--text);

}

.section-tag {

    display: inline-flex;

    align-items: center;

    justify-content: center;

    padding: 8px 18px;

    margin-bottom: 22px;

    border-radius: 999px;

    background: var(--blue-light);

    color: var(--blue);

    font-size: 14px;

    font-weight: 600;

    letter-spacing: .4px;

}

/* ==========================================================
Buttons
========================================================== */

.btn {

    display: inline-flex;

    align-items: center;

    justify-content: center;

    padding: 15px 32px;

    border-radius: 14px;

    font-size: 15px;

    font-weight: 600;

    cursor: pointer;

    transition: var(--transition);

}

.btn-primary {

    background: var(--blue);

    color: #e8dcc8;

    border: none;

}

.btn-primary:hover {

    background: var(--gold-light);

    transform: translateY(-2px);

    box-shadow: var(--shadow-sm);

}

.btn-secondary {

    background: #fff;

    color: var(--primary);

    border: 1px solid var(--border);

}

.btn-secondary:hover {

    border-color: var(--border-strong);

    box-shadow: var(--shadow-xs);

    transform: translateY(-2px);

}

/* ==========================================================
Header
========================================================== */

.header {

    position: fixed;

    top: 0;

    left: 0;

    width: 100%;

    height: 88px;

    background: var(--primary);

    border-bottom: 3px solid var(--blue);

    z-index: 9999;

    transition: .35s;

}

.header-shadow {

    background: var(--primary);

    border-color: var(--blue);

    box-shadow: 0 10px 30px rgba(26, 26, 46, .20);

}

.header-inner {

    height: 88px;

    display: flex;

    justify-content: space-between;

    align-items: center;

}

.logo-title {

    font-family: var(--font-heading);
    font-size: 28px;

    font-weight: 800;

    color: #e8dcc8;

    letter-spacing: 6px;

}

.logo-sub {

    margin-top: 3px;

    font-size: 10px;

    letter-spacing: 2px;

    color: #b0a090;

}

.nav {

    display: flex;

    align-items: center;

    gap: 42px;

}

.nav a {

    position: relative;

    font-size: 14px;

    font-weight: 500;

    color: #b0a090;

}

.nav a::after {

    content: "";

    position: absolute;

    left: 0;

    bottom: -8px;

    width: 0;

    height: 2px;

    background: var(--blue);

    transition: .28s;

}

.nav a:hover {

    color: var(--blue);

}

.nav a:hover::after {

    width: 100%;

}

.header-action {

    display: flex;

    gap: 16px;

    align-items: center;

}

/* ==========================================================
Hero
========================================================== */

.hero {

    padding-top: 150px;

    padding-bottom: 120px;

    background: linear-gradient(180deg, #fcfaf7 0%, #ffffff 100%);

}

.hero-grid {

    display: grid;

    grid-template-columns:1fr 560px;

    gap: 90px;

    align-items: center;

}

.hero h1 {

    font-size: 48px;

    font-weight: 800;

    line-height: 1.08;

    color: var(--primary);

    margin-bottom: 24px;

}

.hero h2 {

    font-size: 28px;

    font-weight: 500;

    color: var(--secondary);

    margin-bottom: 24px;

}

.hero p {

    font-size: 20px;

    line-height: 1.9;

    color: var(--text);

    max-width: 700px;

}

.hero-action {

    display: flex;

    gap: 18px;

    margin-top: 48px;

    margin-bottom: 56px;

}

.hero-svg {

    display: flex;

    align-items: center;

    justify-content: center;

    animation: float 7s ease-in-out infinite;

}

@keyframes float {

    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
    100% {
        transform: translateY(0);
    }

}

.enter-box {

    padding: 36px;

    border-radius: 20px;

    background: #fff;

    border: 1px solid var(--border);

    box-shadow: var(--shadow-md);

}

.enter-title {

    font-size: 24px;

    font-weight: 700;

    color: var(--primary);

    margin-bottom: 8px;

}

.enter-sub {

    font-size: 15px;

    color: var(--text-light);

    margin-bottom: 24px;

}

.enter-form {

    display: grid;

    grid-template-columns:1fr 220px;

    gap: 16px;

}

.enter-form input {

    height: 60px;

    padding: 0 22px;

    border-radius: 14px;

    border: 1px solid var(--border);

    font-size: 16px;

    transition: .25s;

    outline: none;

}

.enter-form input:focus {

    border-color: var(--blue);

    box-shadow: 0 0 0 4px rgba(139, 115, 85, .10);

}

.enter-form button {

    height: 60px;

    border: none;

    border-radius: 14px;

    background: var(--blue);

    color: #e8dcc8;

    font-size: 16px;

    font-weight: 600;

    cursor: pointer;

    transition: var(--transition);

}

.enter-form button:hover {

    background: var(--gold-light);

}

.enter-tip {

    margin-top: 16px;

    font-size: 14px;

    color: #b0a090;

}

/* ==========================================================
   style.css
   Part 02
   Intro / Core Feature / Value / Flow
========================================================== */

/* ==========================================================
Intro
========================================================== */

.intro {

    background: #ffffff;

}

.intro-grid {

    display: grid;

    grid-template-columns:repeat(3, 1fr);

    gap: 32px;

    margin-top: 70px;

}

.intro-card {

    background: #fff;

    border: 1px solid var(--border);

    border-radius: 22px;

    padding: 42px;

    transition: var(--transition);

    box-shadow: var(--shadow-xs);

}

.intro-card:hover {

    transform: translateY(-8px);

    box-shadow: var(--shadow-md);

    border-color: var(--border-medium);

}

.intro-icon {

    width: 72px;

    height: 72px;

    display: flex;

    align-items: center;

    justify-content: center;

    font-size: 34px;

    border-radius: 18px;

    background: var(--blue-light);

    margin-bottom: 26px;

}

.intro-card h3 {

    font-size: 26px;

    font-weight: 700;

    color: var(--primary);

    margin-bottom: 18px;

}

.intro-card p {

    font-size: 17px;

    line-height: 1.9;

    color: var(--text);

}

/* ==========================================================
Feature
========================================================== */

.feature-section {

    background: var(--background-soft);

}

.feature-grid {

    display: grid;

    grid-template-columns:repeat(3, 1fr);

    gap: 34px;

}

.feature-card {

    position: relative;

    padding: 42px;

    border-radius: 22px;

    background: #fff;

    border: 1px solid var(--border);

    transition: var(--transition);

    overflow: hidden;

}

.feature-card::before {

    content: "";

    position: absolute;

    left: 0;

    top: 0;

    width: 4px;

    height: 0;

    background: var(--blue);

    transition: .35s;

}

.feature-card:hover {

    transform: translateY(-10px);

    box-shadow: var(--shadow-md);

}

.feature-card:hover::before {

    height: 100%;

}

.feature-icon {

    width: 74px;

    height: 74px;

    display: flex;

    align-items: center;

    justify-content: center;

    font-size: 34px;

    border-radius: 20px;

    background: var(--blue-light);

    margin-bottom: 28px;

}

.feature-card h3 {

    font-size: 24px;

    font-weight: 700;

    margin-bottom: 16px;

    color: var(--primary);

}

.feature-card p {

    font-size: 17px;

    line-height: 1.95;

    color: var(--text);

}

/* ==========================================================
Value
========================================================== */

.value-section {

    background: #fff;

}

.value-grid {

    display: grid;

    grid-template-columns:repeat(3, 1fr);

    gap: 34px;

}

.value-item {

    padding: 38px;

    border-radius: 22px;

    background: #fff;

    border: 1px solid var(--border);

    transition: var(--transition);

}

.value-item:hover {

    transform: translateY(-8px);

    box-shadow: var(--shadow-md);

}

.value-number {

    width: 56px;

    height: 56px;

    display: flex;

    align-items: center;

    justify-content: center;

    border-radius: 50%;

    background: var(--primary);

    color: #fff;

    font-weight: 700;

    font-size: 20px;

    margin-bottom: 28px;

}

.value-item h3 {

    font-size: 24px;

    font-weight: 700;

    color: var(--primary);

    margin-bottom: 16px;

}

.value-item p {

    font-size: 17px;

    line-height: 1.9;

    color: var(--text);

}

/* ==========================================================
Flow
========================================================== */

.flow-section {

    background: linear-gradient(180deg, #fcfaf7, #FFFFFF);

}

.flow {

    display: flex;

    align-items: center;

    justify-content: center;

    flex-wrap: wrap;

    gap: 18px;

    margin-top: 70px;

}

.flow-box {

    width: 170px;

    height: 130px;

    display: flex;

    flex-direction: column;

    justify-content: center;

    align-items: center;

    text-align: center;

    background: #fff;

    border: 1px solid var(--border);

    border-radius: 20px;

    font-size: 20px;

    font-weight: 700;

    color: var(--primary);

    transition: var(--transition);

    box-shadow: var(--shadow-xs);

}

.flow-box:hover {

    transform: translateY(-6px);

    box-shadow: var(--shadow-sm);

}

.flow-box.dark {

    background: var(--primary);

    color: #fff;

    border: none;

}

.flow-arrow {

    font-size: 38px;

    font-weight: 700;

    color: #b0a090;

    user-select: none;

}

/* ==========================================================
Common Card Animation
========================================================== */

.intro-card,
.feature-card,
.value-item,
.flow-box {

    transition: transform .3s ease,
    box-shadow .3s ease,
    border-color .3s ease;

}

.intro-card:hover,
.feature-card:hover,
.value-item:hover,
.flow-box:hover {

    border-color: var(--border-medium);

}

/* ==========================================================
Background Decoration
========================================================== */

.intro::before,
.feature-section::before,
.value-section::before {

    content: "";

    position: absolute;

    width: 420px;

    height: 420px;

    border-radius: 50%;

    background: radial-gradient(
            rgba(139, 115, 85, .06),
            transparent 70%
    );

    pointer-events: none;

    z-index: 0;

}

.intro::before {

    right: -180px;

    top: -120px;

}

.feature-section::before {

    left: -220px;

    bottom: -220px;

}

.value-section::before {

    right: -180px;

    bottom: -160px;

}

.intro .yyhn-container,
.feature-section .yyhn-container,
.value-section .yyhn-container,
.flow-section .yyhn-container {

    position: relative;

    z-index: 2;

}

/* ==========================================================
   style.css
   Part 03
   Infrastructure / Trust / Facts
========================================================== */

/* ==========================================================
Infrastructure
========================================================== */

.infrastructure {

    background: var(--background-soft);

    position: relative;

}

.infrastructure::before {

    content: "";

    position: absolute;

    top: -220px;

    right: -180px;

    width: 520px;

    height: 520px;

    border-radius: 50%;

    background: radial-gradient(rgba(139, 115, 85, .08), transparent 72%);

    pointer-events: none;

}

.infra-grid {

    display: grid;

    grid-template-columns:repeat(2, 1fr);

    gap: 36px;

    margin-top: 72px;

}

.infra-card {

    position: relative;

    padding: 42px;

    background: #fff;

    border: 1px solid var(--border);

    border-radius: 22px;

    transition: var(--transition);

    box-shadow: var(--shadow-xs);

    overflow: hidden;

}

.infra-card::after {

    content: "";

    position: absolute;

    left: 0;

    top: 0;

    width: 100%;

    height: 4px;

    background: linear-gradient(90deg, var(--blue), #60A5FA);

    transform: scaleX(0);

    transform-origin: left;

    transition: .35s;

}

.infra-card:hover {

    transform: translateY(-8px);

    box-shadow: var(--shadow-md);

}

.infra-card:hover::after {

    transform: scaleX(1);

}

.infra-top {

    display: flex;

    align-items: center;

    gap: 18px;

    margin-bottom: 26px;

}

.infra-icon {

    width: 72px;

    height: 72px;

    display: flex;

    align-items: center;

    justify-content: center;

    font-size: 34px;

    border-radius: 18px;

    background: var(--blue-light);

    flex-shrink: 0;

}

.infra-card h3 {

    font-size: 26px;

    font-weight: 700;

    color: var(--primary);

}

.infra-card p {

    font-size: 17px;

    line-height: 1.95;

    color: var(--text);

    margin-bottom: 24px;

}

.infra-card ul {

    display: grid;

    grid-template-columns:repeat(2, 1fr);

    gap: 14px 18px;

}

.infra-card li {

    position: relative;

    padding-left: 22px;

    font-size: 15px;

    color: var(--secondary);

}

.infra-card li::before {

    content: "";

    position: absolute;

    left: 0;

    top: 10px;

    width: 8px;

    height: 8px;

    border-radius: 50%;

    background: var(--blue);

}

/* ==========================================================
Trust
========================================================== */

.trust {

    background: #fff;

}

.trust-timeline {

    max-width: 980px;

    margin: 70px auto 0;

    position: relative;

}

.trust-timeline::before {

    content: "";

    position: absolute;

    left: 34px;

    top: 0;

    bottom: 0;

    width: 2px;

    background: var(--border-medium);

}

.trust-item {

    display: flex;

    gap: 34px;

    position: relative;

    margin-bottom: 42px;

}

.trust-item:last-child {

    margin-bottom: 0;

}

.trust-index {

    width: 70px;

    height: 70px;

    border-radius: 50%;

    background: var(--blue);

    display: flex;

    align-items: center;

    justify-content: center;

    font-size: 22px;

    font-weight: 700;

    color: #fff;

    flex-shrink: 0;

    position: relative;

    z-index: 2;

    box-shadow: 0 0 0 8px #fff;

}

.trust-content {

    flex: 1;

    padding: 32px 36px;

    background: #fff;

    border: 1px solid var(--border);

    border-radius: 20px;

    transition: var(--transition);

    box-shadow: var(--shadow-xs);

}

.trust-content:hover {

    transform: translateX(8px);

    box-shadow: var(--shadow-md);

}

.trust-content h3 {

    font-size: 24px;

    font-weight: 700;

    margin-bottom: 14px;

    color: var(--primary);

}

.trust-content p {

    font-size: 17px;

    line-height: 1.9;

    color: var(--text);

}

/* ==========================================================
Facts
========================================================== */

.facts {

    background: linear-gradient(180deg, #fcfaf7, #FFFFFF);

}

.facts-grid {

    display: grid;

    grid-template-columns:repeat(4, 1fr);

    gap: 30px;

    margin-top: 60px;

}

.fact-card {

    padding: 44px 24px;

    text-align: center;

    background: #fff;

    border: 1px solid var(--border);

    border-radius: 22px;

    transition: var(--transition);

    box-shadow: var(--shadow-xs);

}

.fact-card:hover {

    transform: translateY(-8px);

    box-shadow: var(--shadow-md);

}

.fact-number {

    font-size: 56px;

    font-weight: 800;

    line-height: 1;

    color: var(--primary);

    margin-bottom: 18px;

    letter-spacing: -1px;

}

.fact-card h3 {

    font-size: 22px;

    font-weight: 700;

    margin-bottom: 14px;

    color: var(--primary);

}

.fact-card p {

    font-size: 16px;

    line-height: 1.8;

    color: var(--text);

}

/* ==========================================================
Appear Animation
========================================================== */

.infra-card,
.trust-item,
.fact-card {

    opacity: 0;

    transform: translateY(35px);

    animation: fadeUp .8s ease forwards;

}

.infra-card:nth-child(1) {
    animation-delay: .05s;
}

.infra-card:nth-child(2) {
    animation-delay: .15s;
}

.infra-card:nth-child(3) {
    animation-delay: .25s;
}

.infra-card:nth-child(4) {
    animation-delay: .35s;
}

.fact-card:nth-child(1) {
    animation-delay: .05s;
}

.fact-card:nth-child(2) {
    animation-delay: .15s;
}

.fact-card:nth-child(3) {
    animation-delay: .25s;
}

.fact-card:nth-child(4) {
    animation-delay: .35s;
}

@keyframes fadeUp {

    0% {

        opacity: 0;

        transform: translateY(35px);

    }

    100% {

        opacity: 1;

        transform: translateY(0);

    }

}

/* ==========================================================
   style.css
   Part 04
   Boundary / No APP / Future
========================================================== */

/* ==========================================================
Boundary
========================================================== */

.boundary {

    background: #ffffff;

    position: relative;

}

.boundary::before {

    content: "";

    position: absolute;

    left: -220px;

    top: -120px;

    width: 520px;

    height: 520px;

    border-radius: 50%;

    background: radial-gradient(rgba(139, 115, 85, .06), transparent 72%);

    pointer-events: none;

}

.boundary-grid {

    display: grid;

    grid-template-columns:repeat(3, 1fr);

    gap: 30px;

    margin-top: 70px;

}

.boundary-card {

    position: relative;

    padding: 40px 34px;

    background: #fff;

    border: 1px solid var(--border);

    border-radius: 22px;

    transition: var(--transition);

    overflow: hidden;

    box-shadow: var(--shadow-xs);

}

.boundary-card::before {

    content: "";

    position: absolute;

    left: 0;

    top: 0;

    width: 100%;

    height: 4px;

    background: var(--blue);

    transform: scaleX(0);

    transform-origin: left;

    transition: .3s;

}

.boundary-card:hover {

    transform: translateY(-8px);

    box-shadow: var(--shadow-md);

}

.boundary-card:hover::before {

    transform: scaleX(1);

}

.boundary-icon {

    width: 64px;

    height: 64px;

    display: flex;

    align-items: center;

    justify-content: center;

    font-size: 28px;

    font-weight: 700;

    color: var(--blue);

    background: var(--blue-light);

    border-radius: 18px;

    margin-bottom: 24px;

}

.boundary-card h3 {

    font-size: 22px;

    font-weight: 700;

    color: var(--primary);

    margin-bottom: 14px;

}

.boundary-card h3 .xmark {

    color: var(--blue);

}

.boundary-card p {

    font-size: 16px;

    line-height: 1.9;

    color: var(--text);

}

/* ==========================================================
No APP
========================================================== */

.no-app {

    background: linear-gradient(180deg, #fcfaf7, #FFFFFF);

}

.no-app-grid {

    display: grid;

    grid-template-columns:1fr 460px;

    gap: 90px;

    align-items: center;

}

.no-app-left h2 {

    margin-bottom: 28px;

}

.no-app-left p {

    font-size: 18px;

    line-height: 2;

    margin-bottom: 24px;

    color: var(--text);

}

.device-card {

    display: flex;

    justify-content: center;

    align-items: center;

}

.device-phone {

    width: 310px;

    padding: 20px;

    background: #1a1a2e;

    border-radius: 42px;

    box-shadow: 0 35px 70px rgba(26, 26, 46, .25);

}

.device-screen {

    height: 560px;

    border-radius: 30px;

    background: #fff;

    display: flex;

    flex-direction: column;

    justify-content: center;

    align-items: center;

    text-align: center;

    padding: 50px;

}

.device-icon {

    font-size: 68px;

    margin-bottom: 36px;

}

.device-text {

    font-size: 28px;

    font-weight: 700;

    line-height: 1.7;

    color: var(--primary);

}

/* ==========================================================
Future
========================================================== */

.future {

    background: #ffffff;

}

.future-card {

    max-width: 980px;

    margin: auto;

    padding: 80px;

    border-radius: 30px;

    background: linear-gradient(135deg, #1a1a2e, #2a2a3e);

    color: #fff;

    position: relative;

    overflow: hidden;

    box-shadow: var(--shadow-lg);

}

.future-card::after {

    content: "";

    position: absolute;

    right: -120px;

    top: -120px;

    width: 340px;

    height: 340px;

    border-radius: 50%;

    background: rgba(255, 255, 255, .05);

}

.future .section-tag {

    background: rgba(255, 255, 255, .12);

    color: #fff;

}

.future-card h2 {

    font-size: 48px;

    font-weight: 800;

    line-height: 1.3;

    margin-bottom: 30px;

}

.future-card p {

    font-size: 19px;

    line-height: 2;

    margin-bottom: 24px;

    color: rgba(255, 255, 255, .88);

}

.future-action {

    margin-top: 42px;

}

.future-action .btn {

    background: #fff;

    color: var(--primary);

}

.future-action .btn:hover {

    background: #fcfaf7;

    transform: translateY(-3px);

}

/* ==========================================================
Hover Animation
========================================================== */

.boundary-card,
.device-phone,
.future-card {

    transition: all .35s ease;

}

.device-phone:hover {

    transform: translateY(-8px) rotate(-1deg);

}

.future-card:hover {

    transform: translateY(-6px);

}

/* ==========================================================
   style.css
   Part 05
   Governance / Knowledge / Knowledge Base / FAQ
========================================================== */

/* ==========================================================
Governance
========================================================== */

.governance {

    background: #fcfaf7;

    position: relative;

    overflow: hidden;

}

.governance::before {

    content: "";

    position: absolute;

    right: -180px;

    top: -120px;

    width: 480px;

    height: 480px;

    border-radius: 50%;

    background: radial-gradient(rgba(139, 115, 85, .06), transparent 72%);

    pointer-events: none;

}

.governance-grid {

    display: grid;

    grid-template-columns:repeat(4, 1fr);

    gap: 28px;

    margin-top: 70px;

}

.governance-card {

    display: block;

    padding: 36px 30px;

    background: #fff;

    border-radius: 20px;

    border: 1px solid var(--border);

    box-shadow: var(--shadow-xs);

    transition: var(--transition);

    height: 100%;

}

.governance-card:hover {

    transform: translateY(-8px);

    box-shadow: var(--shadow-md);

    border-color: var(--border-medium);

}

.gov-icon {

    width: 64px;

    height: 64px;

    display: flex;

    align-items: center;

    justify-content: center;

    font-size: 30px;

    border-radius: 18px;

    background: var(--blue-light);

    margin-bottom: 24px;

}

.governance-card h3 {

    font-size: 22px;

    font-weight: 700;

    line-height: 1.45;

    margin-bottom: 16px;

    color: var(--primary);

}

.governance-card p {

    font-size: 16px;

    line-height: 1.9;

    color: var(--text);

}

/* ==========================================================
Knowledge
========================================================== */

.knowledge {

    background: #ffffff;

}

.knowledge-layout {

    display: grid;

    grid-template-columns:1.2fr .8fr;

    gap: 60px;

    align-items: start;

    margin-top: 70px;

}

.knowledge-main {

    padding: 48px;

    border-radius: 24px;

    background: #fcfaf7;

    border: 1px solid var(--border);

}

.knowledge-main h3 {

    font-size: 32px;

    font-weight: 700;

    color: var(--primary);

    margin-bottom: 24px;

}

.knowledge-main p {

    font-size: 18px;

    line-height: 2;

    margin-bottom: 36px;

    color: var(--text);

}

.knowledge-list {

    display: flex;

    flex-direction: column;

    gap: 18px;

}

.knowledge-list a {

    display: flex;

    align-items: center;

    justify-content: space-between;

    padding: 22px 26px;

    background: #fff;

    border-radius: 18px;

    border: 1px solid var(--border);

    font-size: 17px;

    font-weight: 500;

    transition: var(--transition);

}

.knowledge-list a::after {

    content: "→";

    font-size: 18px;

    color: #b0a090;

    transition: var(--transition);

}

.knowledge-list a:hover {

    transform: translateX(8px);

    border-color: var(--border-medium);

    box-shadow: var(--shadow-xs);

}

.knowledge-list a:hover::after {

    transform: translateX(6px);

    color: var(--blue);

}

/* ==========================================================
Knowledge Base
========================================================== */

.knowledge-base {

    background: linear-gradient(180deg, #FFFFFF, #fcfaf7);

}

.base-card {

    padding: 70px;

    border-radius: 30px;

    background: #fff;

    border: 1px solid var(--border);

    box-shadow: var(--shadow-sm);

}

.base-card h2 {

    font-size: 44px;

    font-weight: 800;

    line-height: 1.3;

    margin-bottom: 26px;

    color: var(--primary);

}

.base-card p {

    font-size: 19px;

    line-height: 2;

    color: var(--text);

    margin-bottom: 48px;

}

.base-items {

    display: grid;

    grid-template-columns:repeat(3, 1fr);

    gap: 24px;

}

.base-items div {

    padding: 32px;

    border-radius: 18px;

    background: #fcfaf7;

    border: 1px solid var(--border);

    transition: var(--transition);

}

.base-items div:hover {

    transform: translateY(-6px);

    box-shadow: var(--shadow-xs);

}

.base-items h4 {

    font-size: 20px;

    font-weight: 700;

    color: var(--primary);

}

/* ==========================================================
FAQ
========================================================== */

.faq {

    background: #ffffff;

}

.faq-wrapper {

    max-width: 980px;

    margin: 70px auto 0;

    display: flex;

    flex-direction: column;

    gap: 22px;

}

.faq-item {

    padding: 34px 38px;

    background: #fff;

    border-radius: 20px;

    border: 1px solid var(--border);

    transition: var(--transition);

    box-shadow: var(--shadow-xs);

}

.faq-item:hover {

    box-shadow: var(--shadow-sm);

    border-color: var(--border-medium);

}

.faq-item h3 {

    font-size: 24px;

    font-weight: 700;

    color: var(--primary);

    margin-bottom: 16px;

    display: flex;

    align-items: center;

    gap: 10px;

}

.faq-item h3::before {

    content: "+";

    font-size: 24px;

    font-weight: 700;

    color: var(--blue);

    flex-shrink: 0;

    line-height: 1;

}

.faq-item p {

    font-size: 17px;

    line-height: 2;

    color: var(--text);

    padding-left: 28px;

}

/* ==========================================================
Section Animation
========================================================== */

.governance-card,
.knowledge-list a,
.base-items div,
.faq-item {

    transition: transform .3s ease,
    box-shadow .3s ease,
    border-color .3s ease,
    background .3s ease;

}

/* ==========================================================
   style.css
   Part 06（Final）
   CTA / Footer / Utilities / Responsive
========================================================== */

/* ==========================================================
CTA
========================================================== */

.cta {

    background: linear-gradient(180deg, #fcfaf7, #FFFFFF);

    padding: 120px 0;

}

.cta-box {

    max-width: 980px;

    margin: auto;

    padding: 90px 80px;

    border-radius: 32px;

    background: linear-gradient(135deg, #1a1a2e, #2a2a3e);

    text-align: center;

    color: #fff;

    position: relative;

    overflow: hidden;

    box-shadow: var(--shadow-lg);

}

.cta-box::before {

    content: "";

    position: absolute;

    width: 460px;

    height: 460px;

    right: -180px;

    top: -180px;

    border-radius: 50%;

    background: rgba(255, 255, 255, .05);

}

.cta-box::after {

    content: "";

    position: absolute;

    width: 260px;

    height: 260px;

    left: -100px;

    bottom: -100px;

    border-radius: 50%;

    background: rgba(255, 255, 255, .03);

}

.cta .section-tag {

    background: rgba(255, 255, 255, .12);

    color: #fff;

}

.cta-box h2 {

    font-size: 52px;

    font-weight: 800;

    line-height: 1.35;

    margin-bottom: 30px;

    position: relative;

    z-index: 2;

}

.cta-box p {

    max-width: 760px;

    margin: auto;

    font-size: 20px;

    line-height: 2;

    color: rgba(255, 255, 255, .9);

    position: relative;

    z-index: 2;

}

.cta-buttons {

    display: flex;

    justify-content: center;

    gap: 20px;

    margin-top: 48px;

    position: relative;

    z-index: 2;

}

.cta-buttons .btn-primary {

    background: #fff;

    color: var(--primary);

}

.cta-buttons .btn-primary:hover {

    background: #fcfaf7;

}

.cta-buttons .btn-secondary {

    background: transparent;

    border: 1px solid rgba(255, 255, 255, .28);

    color: #fff;

}

.cta-buttons .btn-secondary:hover {

    background: rgba(255, 255, 255, .08);

}

/* ==========================================================
Footer
========================================================== */

.footer {

    background: #1a1a2e;

    color: #c8bca8;

    border-top: 2px solid var(--blue);

    padding: 90px 0 40px;

}

.footer-top {

    display: grid;

    grid-template-columns:2fr 1fr 1fr 1fr;

    gap: 60px;

    margin-bottom: 50px;

}

.footer-brand h3 {

    font-size: 34px;

    font-weight: 800;

    color: #fff;

    margin-bottom: 18px;

}

.footer-brand p {

    font-size: 16px;

    line-height: 2;

    color: #b0a090;

}

.footer-column h4 {

    font-size: 18px;

    font-weight: 700;

    color: #fff;

    margin-bottom: 20px;

}

.footer-column ul {

    display: flex;

    flex-direction: column;

    gap: 14px;

}

.footer-column a {

    color: #b0a090;

    transition: .25s;

}

.footer-column a:hover {

    color: #fff;

    padding-left: 6px;

}

.footer hr {

    border: none;

    height: 1px;

    background: rgba(255, 255, 255, .08);

    margin: 40px 0;

}

.footer-bottom {

    display: flex;

    justify-content: space-between;

    align-items: center;

    gap: 20px;

    font-size: 14px;

    color: #b0a090;

    flex-wrap: wrap;

}

/* ==========================================================
Utility
========================================================== */

.text-center {

    text-align: center;

}

.mt-0 {
    margin-top: 0;
}

.mt-20 {
    margin-top: 20px;
}

.mt-40 {
    margin-top: 40px;
}

.mt-60 {
    margin-top: 60px;
}

.mb-0 {
    margin-bottom: 0;
}

.mb-20 {
    margin-bottom: 20px;
}

.mb-40 {
    margin-bottom: 40px;
}

.mb-60 {
    margin-bottom: 60px;
}

.hidden {

    display: none !important;

}

.fade-up {

    opacity: 0;

    transform: translateY(30px);

    transition: all .8s ease;

}

.fade-up.show {

    opacity: 1;

    transform: none;

}

/* ==========================================================
Responsive
========================================================== */

@media (max-width: 1280px) {

    .yyhn-container {

        width: 100%;

        padding: 0 32px;

    }

    .hero-grid,
    .no-app-grid,
    .knowledge-layout {

        grid-template-columns:1fr;

        gap: 60px;

    }

    .hero-svg {

        order: -1;

    }

    .footer-top {

        grid-template-columns:repeat(2, 1fr);

    }

}

@media (max-width: 992px) {

    section {

        padding: 90px 0;

    }

    .section-head h2 {

        font-size: 38px;

    }

    .hero h1 {

        font-size: 38px;

    }

    .hero h2 {

        font-size: 22px;

    }

    .intro-grid,
    .feature-grid,
    .value-grid,
    .boundary-grid,
    .infra-grid,
    .governance-grid,
    .base-items,
    .facts-grid {

        grid-template-columns:repeat(2, 1fr);

    }

    .enter-form {

        grid-template-columns:1fr;

    }

    .flow {

        flex-direction: column;

    }

    .flow-arrow {

        transform: rotate(90deg);

    }

    .cta-box {

        padding: 70px 50px;

    }

    .cta-box h2 {

        font-size: 42px;

    }

    .footer-top {

        grid-template-columns:1fr;

    }

}

@media (max-width: 768px) {

    .header {

        height: 72px;

    }

    .header-inner {

        height: 72px;

    }

    .nav {

        display: none;

    }

    .header-action {

        display: none;

    }

    .logo-title {

        font-size: 22px;

    }

    .hero {

        padding-top: 120px;

    }

    .hero h1 {

        font-size: 32px;

        line-height: 1.2;

    }

    .hero h2 {

        font-size: 18px;

    }

    .hero p {

        font-size: 17px;

    }

    .section-head h2 {

        font-size: 32px;

    }

    .section-head p {

        font-size: 17px;

    }

    .intro-grid,
    .feature-grid,
    .value-grid,
    .boundary-grid,
    .infra-grid,
    .governance-grid,
    .base-items,
    .facts-grid {

        grid-template-columns:1fr;

    }

    .future-card {

        padding: 50px 36px;

    }

    .future-card h2 {

        font-size: 34px;

    }

    .base-card {

        padding: 45px 32px;

    }

    .base-card h2 {

        font-size: 34px;

    }

    .knowledge-main {

        padding: 36px;

    }

    .cta-box {

        padding: 55px 30px;

    }

    .cta-box h2 {

        font-size: 34px;

    }

    .cta-buttons {

        flex-direction: column;

    }

    .footer-bottom {

        flex-direction: column;

        align-items: flex-start;

    }

}

@media (max-width: 480px) {

    .yyhn-container {

        padding: 0 20px;

    }

    .hero h1 {

        font-size: 28px;

    }

    .hero h2 {

        font-size: 18px;

    }

    .hero p {

        font-size: 16px;

    }

    .section-head h2 {

        font-size: 28px;

    }

    .btn {

        width: 100%;

    }

    .hero-action {

        flex-direction: column;

    }

    .enter-box {

        padding: 24px;

    }

    .trust-item {

        gap: 18px;

    }

    .trust-index {

        width: 56px;

        height: 56px;

        font-size: 18px;

    }

    .trust-content {

        padding: 24px;

    }

    .device-phone {

        width: 100%;

        max-width: 300px;

    }

}

/* ==========================================================
End of style.css
Version : V4.0 Production
========================================================== */