/* =========================================
   BASE STYLES (White Minimal)
   ========================================= */
:root {
    --c-bg: #ffffff;
    --c-text-main: #111111;
    --c-text-sub: #555555;
    --c-accent: #C5A059;
    --c-border: #e0e0e0;
    
    --c-web-blue: #2A70C2;
    --c-media-red: #C0021B;
    --c-vietnam-green: #20A382;
    
    --font-head: 'Antonio', sans-serif;
    --font-jp-sans: 'Noto Sans JP', sans-serif;
    --font-jp-serif: 'Noto Serif JP', serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    width: 100%;
    background-color: var(--c-bg);
    color: var(--c-text-main);
    font-family: var(--font-jp-sans);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    line-height: 1.8;
    position: relative;
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }
h1, h2, h3, h4 { margin: 0; line-height: 1.2; }

.br-pc {
    display: inline;
}

/* --- Three.js Background --- */
#canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0; /* Background layer */
    pointer-events: none;
}

/* Footer Canvas */
#footer-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.6;
}

/* --- Header Navigation --- */
#site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 30px 5vw; /* PC Default Padding */
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: padding 0.3s;
}
.header-logo {
    width: 160px;
    color: #000;
    display: block;
    line-height: 0;
    transition: width 0.3s;
}
.header-logo img {
    width: 100%;
    height: auto;
}

/* PC Menu Styles */
.menu-list { display: flex; gap: 3vw; }
.menu-item {
    font-family: var(--font-head);
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    position: relative;
    cursor: pointer;
    color: #161F4A;
    font-weight: 700;
}
.menu-item::after {
    content: ''; position: absolute; bottom: -5px; left: 0; width: 0%; height: 2px; background: var(--c-accent); transition: 0.3s;
}
.menu-item:hover::after { width: 100%; }

/* Hamburger Icon (Hidden on PC) */
.hamburger {
    display: none;
    cursor: pointer;
    width: 30px;
    height: 20px;
    position: relative;
    z-index: 1100; /* Menu Overlayより上 */
}
.hamburger span {
    display: block;
    position: absolute;
    height: 2px;
    width: 100%;
    background: #333;
    border-radius: 2px;
    transition: all 0.3s ease-in-out;
    left: 0;
}
.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 9px; }
.hamburger span:nth-child(3) { top: 18px; }

/* Hamburger Active State (X Shape) */
.hamburger.active span:nth-child(1) {
    top: 9px;
    transform: rotate(45deg);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
}
.hamburger.active span:nth-child(3) {
    top: 9px;
    transform: rotate(-45deg);
}

/* --- Hero Section --- */
#text-container {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    display: flex; flex-direction: column;
    justify-content: center;
    padding-left: 10vw;
    z-index: 10;
    pointer-events: none;
}
.hero-main {
    font-family: var(--font-head);
    font-size: clamp(4rem, 13vw, 13rem);
    line-height: 0.9;
    letter-spacing: -0.02em;
    margin-bottom: 2rem;
    color: #161F4A;
}
.hero-main span { display: block; }

.hero-sub {
    font-family: var(--font-jp-serif);
    font-weight: 600;
    font-size: clamp(1rem, 2vw, 1.5rem);
    letter-spacing: 0.1em;
    margin-left: 10px;
    color: var(--c-text-sub);
    background: rgba(255,255,255,0.8);
    display: inline-block;
    padding: 5px 10px;
}

/* --- Content Layout --- */
main { position: relative; z-index: 20; }
.spacer { height: 100vh; }

section {
    position: relative;
    padding: 140px 5vw;
    min-height: 100vh;
    background: transparent; 
    display: flex;
    flex-direction: column;
    align-items: center;
    border-bottom: 1px solid var(--c-border);
    background: rgba(255, 255, 255, 0.9);
}
#about { background: rgba(255,255,255,0.5); }

.section-bg-text {
    position: absolute;
    top: 10%; left: 50%; transform: translateX(-50%);
    font-family: var(--font-head);
    font-size: 20vw;
    font-weight: 700;
    color: rgba(0,0,0,0.03); 
    z-index: -1;
    line-height: 1;
    pointer-events: none;
    white-space: nowrap;
}

.section-container {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
}

/* --- About --- */
.about-text-wrap {
    text-align: center;
    color: var(--c-text-main);
    margin-top: 10vh;
    margin-bottom: 80px; /* カードとの間隔 */
}
.about-head {
    font-family: var(--font-jp-serif);
    font-size: clamp(2rem, 4vw, 3.5rem);
    margin-bottom: 3rem;
    line-height: 1.4;
    color: #000;
}
.about-desc {
    font-size: 1.05rem;
    line-height: 2.2;
    max-width: 800px;
    margin: 0 auto;
    text-align: justify;
    text-align-last: center;
    color: var(--c-text-sub);
}

/* --- Business Intro Cards (New Area) --- */
.biz-intro-area {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 40px;
    text-align: left;
    width: 100%;
}

.biz-intro-card {
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid #eaeaea;
    padding: 40px 30px;
    border-radius: 2px;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    cursor: pointer;
    position: relative;
    box-shadow: 0 5px 15px rgba(0,0,0,0.02);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.biz-intro-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
}

/* Hover border effect per color */
.biz-intro-card[data-type="web"]:hover { border-top: 4px solid var(--c-web-blue); }
.biz-intro-card[data-type="media"]:hover { border-top: 4px solid var(--c-media-red); }
.biz-intro-card[data-type="vietnam"]:hover { border-top: 4px solid var(--c-vietnam-green); }

.intro-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 20px;
}

.intro-num {
    font-family: var(--font-head);
    font-size: 3rem;
    font-weight: 700;
    opacity: 0.1;
    line-height: 1;
    color: #000;
}

.intro-title {
    font-family: var(--font-head);
    font-size: 1.5rem;
    font-weight: 700;
    color: #111;
    line-height: 1.1;
    letter-spacing: 0.05em;
    text-align: right;
}

.intro-desc {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 30px;
    line-height: 1.6;
}

.intro-btn {
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: 0.3s;
    margin-top: auto;
    border-bottom: 1px solid #ddd;
    padding-bottom: 10px;
    color: #111;
}

.intro-arrow {
    font-size: 1.2rem;
    transition: 0.3s;
}

.biz-intro-card:hover .intro-btn {
    border-bottom-color: currentColor;
}
.biz-intro-card:hover .intro-arrow {
    transform: translateX(5px);
}

/* Color variations for buttons */
.biz-intro-card[data-type="web"]:hover .intro-btn { color: var(--c-web-blue); }
.biz-intro-card[data-type="media"]:hover .intro-btn { color: var(--c-media-red); }
.biz-intro-card[data-type="vietnam"]:hover .intro-btn { color: var(--c-vietnam-green); }


/* --- Business Sections Detail --- */
.biz-header {
    margin-bottom: 60px;
    border-left: 5px solid var(--c-accent);
    padding-left: 30px;
}
.biz-label {
    font-family: var(--font-head);
    font-size: 1rem;
    color: var(--c-accent);
    letter-spacing: 0.2em;
    display: block;
    margin-bottom: 15px;
    font-weight: 700;
}
.biz-title {
    font-family: var(--font-jp-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    color: #000;
}
.biz-lead {
    font-size: 1.1rem;
    margin-top: 20px;
    color: #444;
    max-width: 800px;
}

.biz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 60px;
}
.biz-card {
    background: #fff;
    border: 1px solid #ddd;
    padding: 40px;
    transition: 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    box-shadow: 0 5px 15px rgba(0,0,0,0.03);
}
.biz-card:hover {
    border-color: var(--c-accent);
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.08);
}
.biz-card h3 {
    font-family: var(--font-jp-serif);
    font-size: 1.4rem;
    margin-top: 25px;
    margin-bottom: 20px;
    color: #000;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 15px;
    display: inline-block;
}
.biz-card p {
    font-size: 0.95rem;
    color: #666;
    line-height: 1.8;
}
.biz-check-list li {
    position: relative;
    padding-left: 1.5em;
    margin-bottom: 0.8em;
    color: #444;
    font-weight: 500;
}
.biz-check-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--c-accent);
    font-weight: bold;
}

/* --- CHART & DATA VISUALIZATION --- */
.chart-box {
    padding: 40px;
    background: #fdfdfd;
    border: 1px solid #eee;
    margin-bottom: 40px;
    position: relative;
}
.chart-box h4 {
    font-family: var(--font-head);
    font-size: 1.2rem;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
    color: #000;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}
.chart-description {
    font-size: 0.95rem;
    color: #555;
    margin-bottom: 40px;
    line-height: 1.8;
}
.chart-caption {
    font-size: 0.85rem;
    color: #888;
    margin-top: 20px;
    text-align: right;
}

/* Bar Chart (Web) */
.bar-group {
    margin-bottom: 20px;
}
.bar-label {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 5px;
    font-weight: 700;
    color: #555;
}
.bar-track {
    width: 100%;
    height: 12px;
    background: #f0f0f0;
    border-radius: 2px;
    overflow: hidden;
}
.bar-fill {
    height: 100%;
    width: 0; /* Animate this */
    transition: width 1.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.chart-split-row {
    display: flex;
    gap: 40px;
}
.chart-half {
    flex: 1;
}
.sub-chart-title {
    font-family: var(--font-head);
    font-size: 1rem;
    color: #888;
    margin-bottom: 15px;
    letter-spacing: 0.05em;
    border-bottom: 1px dashed #eee;
    padding-bottom: 5px;
}

/* Vertical Chart (Media) */
.vertical-chart {
    display: flex;
    justify-content: space-around;
    align-items: flex-end;
    height: 200px;
    padding-bottom: 10px;
    border-bottom: 1px solid #ccc;
}
.v-bar-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 30%;
    height: 100%;
    justify-content: flex-end;
}
.v-bar {
    width: 100%;
    background: #ccc;
    height: 0; /* Animate */
    transition: height 1.5s cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
}
.v-bar span {
    position: absolute;
    top: -25px;
    width: 100%;
    text-align: center;
    font-weight: bold;
    font-family: var(--font-head);
}
.v-bar-group > span {
    margin-top: 10px;
    font-size: 0.9rem;
    font-weight: 700;
}

/* VIETNAM VISUAL GRID */
.vietnam-visual-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 40px;
    align-items: center;
}

/* Matching Diagram */
.matching-diagram {
    position: relative;
    height: 250px;
    display: flex;
    justify-content: center;
    align-items: center;
}
.circle-group {
    position: absolute;
    width: 160px;
    height: 160px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    transition: transform 0.5s;
}
.circle-jp {
    background: rgba(42, 112, 194, 0.1);
    border: 2px solid var(--c-web-blue);
    left: 0;
    z-index: 1;
}
.circle-vn {
    background: rgba(32, 163, 130, 0.1);
    border: 2px solid var(--c-vietnam-green);
    right: 0;
    z-index: 1;
}
.circle-center {
    z-index: 2;
    background: #fff;
    border: 2px solid var(--c-accent);
    width: 100px;
    height: 100px;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}
.diagram-label {
    font-family: var(--font-head);
    font-weight: 700;
    font-size: 1.2rem;
    line-height: 1;
}
.diagram-sub {
    font-size: 0.7rem;
    margin-top: 5px;
    font-weight: 700;
    color: #555;
}

/* Growth Chart SVG */
.growth-chart-wrap {
    position: relative;
    padding: 20px;
}
.chart-svg {
    width: 100%;
    height: auto;
    overflow: visible;
}
.chart-grid-line { stroke: #eee; stroke-width: 1; }
.chart-axis-text { font-size: 10px; fill: #999; font-family: var(--font-head); }
.chart-area {
    fill: rgba(32, 163, 130, 0.1);
    stroke: none;
    opacity: 0; /* Animate */
}
.chart-line {
    fill: none;
    stroke: var(--c-vietnam-green);
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000; /* Animate */
}
.chart-point {
    fill: #fff;
    stroke: var(--c-vietnam-green);
    stroke-width: 2;
    r: 4;
    opacity: 0; /* Animate */
}
.point-label {
    font-family: var(--font-head);
    font-size: 12px;
    font-weight: bold;
    fill: var(--c-vietnam-green);
    opacity: 0; /* Animate */
}

/* WEB CTA BOX */
.web-cta-box {
    margin-top: 80px; 
    text-align: center; 
    background: #fcfcfc; 
    padding: 60px 40px; 
    border: 1px solid #eee;
    position: relative;
}
.web-cta-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--c-web-blue);
}
.btn-main {
    display: inline-block;
    padding: 15px 50px;
    background: var(--c-web-blue);
    color: #fff;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: 0.3s;
    border: 1px solid var(--c-web-blue);
    text-decoration: none;
    margin-top: 20px;
}
.btn-main:hover {
    background: transparent;
    color: var(--c-web-blue);
}

/* MEDIA CTA BOX */
.media-cta-box {
    margin-top: 80px; 
    text-align: center; 
    background: #fcfcfc; 
    padding: 60px 40px; 
    border: 1px solid #eee;
    position: relative;
}
.media-cta-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--c-media-red);
}
.btn-media {
    display: inline-block;
    padding: 15px 50px;
    background: var(--c-media-red);
    color: #fff;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: 0.3s;
    border: 1px solid var(--c-media-red);
    text-decoration: none;
    margin-top: 20px;
}
.btn-media:hover {
    background: transparent;
    color: var(--c-media-red);
}

/* VIETNAM FLOW & CTA */
.vietnam-flow-box {
    margin-top: 80px;
    padding-top: 60px;
    border-top: 1px solid #eee;
}
.flow-title {
    text-align: center;
    font-family: var(--font-jp-serif);
    font-size: 1.5rem;
    margin-bottom: 40px;
    font-weight: 900;
    color: #000;
}
.step-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 800px;
    margin: 0 auto 50px;
    position: relative;
}
.step-item {
    display: flex;
    align-items: flex-start;
    padding: 25px;
    background: #fff;
    border: 1px solid #eee;
    position: relative;
    transition: 0.3s;
    z-index: 1;
}
.step-item:hover {
    border-color: var(--c-vietnam-green);
    transform: translateX(5px);
}
.step-num {
    font-family: var(--font-head);
    font-size: 1.5rem;
    color: var(--c-vietnam-green);
    font-weight: 700;
    margin-right: 20px;
    min-width: 40px;
    line-height: 1;
    margin-top: 2px;
}
.step-content h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: #000;
}
.step-content p {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.6;
    margin: 0;
}
/* Connecting line for visual flow */
.step-list::before {
    content: '';
    position: absolute;
    top: 20px;
    bottom: 20px;
    left: 44px; /* Align with number center approx */
    width: 1px;
    background: #eee;
    z-index: 0;
}

.btn-vietnam {
    display: block;
    width: fit-content;
    margin: 0 auto;
    padding: 15px 60px;
    background: var(--c-vietnam-green);
    color: #fff;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: 0.3s;
    border: 1px solid var(--c-vietnam-green);
    text-decoration: none;
}
.btn-vietnam:hover {
    background: transparent;
    color: var(--c-vietnam-green);
}

/* Specific Colors per Section */
#web .biz-header { border-color: var(--c-web-blue); }
#web .biz-label, #web .biz-check-list li::before { color: var(--c-web-blue); }
#web .biz-card:hover { border-color: var(--c-web-blue); }

#media .biz-header { border-color: var(--c-media-red); }
#media .biz-label, #media .biz-check-list li::before { color: var(--c-media-red); }
#media .biz-card:hover { border-color: var(--c-media-red); }

#vietnam .biz-header { border-color: var(--c-vietnam-green); }
#vietnam .biz-label, #vietnam .biz-check-list li::before { color: var(--c-vietnam-green); }
#vietnam .biz-card:hover { border-color: var(--c-vietnam-green); }

/* Problem/Solution Box */
.problem-box {
    border: 2px solid #eee;
    padding: 40px;
    margin-top: 40px;
    background: #fcfcfc;
}
.problem-title {
    color: #D0021B;
    font-weight: bold;
    font-size: 1.2rem;
    margin-bottom: 20px;
    display: block;
}

/* Risk List Styles */
.risk-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin-top: 30px;
    text-align: left;
}
.risk-item {
    padding-bottom: 30px;
    border-bottom: 1px dashed #ddd;
}
.risk-item:last-child {
    padding-bottom: 0;
    border-bottom: none;
}
.risk-head {
    font-weight: 700;
    color: #D0021B; /* Warning Red */
    font-size: 1.1rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}
.risk-head::before {
    content: '!';
    display: inline-block;
    width: 20px;
    height: 20px;
    background: #D0021B;
    color: #fff;
    text-align: center;
    line-height: 20px;
    border-radius: 50%;
    margin-right: 10px;
    font-size: 0.8rem;
}

/* --- Footer --- */
footer {
    background: #161F4A; /* Contrast Footer */
    color: #fff;
    padding: 100px 5vw;
    position: relative;
    z-index: 20;
    text-align: center;
}
.footer-logo {
    font-family: var(--font-head);
    font-size: 4rem;
    line-height: 1;
    margin-bottom: 2rem;
    color: #fff;
}
/* Footer Info */
.footer-info {
    margin-bottom: 40px;
    color: #ccc;
    font-size: 0.95rem;
    line-height: 2;
    font-family: var(--font-jp-sans);
}

/* Contact Form Styles (Minimal) */
.form-wrapper {
    width: 100%;
    max-width: 700px;
    margin: 0 auto 80px;
    background: #fff;
    padding: 50px;
    border-radius: 2px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    text-align: left;
}
.contact-form {
    display: grid;
    gap: 25px;
}
.form-group {
    display: flex;
    flex-direction: column;
}
.form-label {
    font-size: 0.9rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
}
.badge-required {
    background: var(--c-media-red);
    color: #fff;
    font-size: 0.7rem;
    padding: 2px 6px;
    margin-left: 8px;
    border-radius: 2px;
}
.badge-any {
    background: #ccc;
    color: #fff;
    font-size: 0.7rem;
    padding: 2px 6px;
    margin-left: 8px;
    border-radius: 2px;
}
.form-input, .form-textarea {
    width: 100%;
    padding: 12px 15px;
    font-size: 1rem;
    border: 1px solid #ddd;
    background: #fdfdfd;
    border-radius: 2px;
    transition: 0.3s;
    font-family: var(--font-jp-sans);
}
.form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--c-accent);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(197, 160, 89, 0.1);
}
.form-textarea {
    resize: vertical;
    min-height: 150px;
}
.form-btn {
    background: #111;
    color: #fff;
    border: 1px solid #111;
    padding: 15px 40px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: 0.3s;
    align-self: center;
    width: 100%;
    margin-top: 20px;
}
.form-btn:hover {
    background: #fff;
    color: #111;
}

/* Success Message Overlay */
.form-success {
    display: none;
    text-align: center;
    padding: 40px;
    background: #f0fffa;
    border: 1px solid var(--c-vietnam-green);
    color: var(--c-vietnam-green);
}
.form-success h4 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

/* --- Mobile --- */
@media (max-width: 768px) {
    /* Header */
    #site-header { padding: 15px 20px; }
    .header-logo { width: 120px; }

    /* Hamburger Logic */
    .hamburger { display: block; }
    .menu-list {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0; right: 0;
        width: 100%; height: 100vh;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        justify-content: center;
        align-items: center;
        gap: 40px;
        transform: translateX(100%);
        transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        z-index: 1000;
        padding: 0; margin: 0;
    }
    .menu-list.active { transform: translateX(0); }
    .menu-item { font-size: 1.5rem; }

    /* Other Mobile Adjustments */
    #text-container { padding-left: 20px; }
    .hero-main { font-size: 15vw; }
    
    /* Grid Adjustments */
    .biz-grid, .biz-intro-area { grid-template-columns: 1fr; }
    .chart-split-row { flex-direction: column; gap: 30px; }
    .vietnam-visual-grid { grid-template-columns: 1fr; }
    
    section { padding: 80px 20px; }
    .about-head { font-size: 1.8rem; }
    .matching-diagram { transform: scale(0.8); }
    .form-wrapper { padding: 30px 20px; margin-bottom: 60px; }
    .br-pc { display: none; }
}