/* SoftBank-Inspired Official Enterprise Design System - Final High-End Version */
:root {
    --primary-blue: #0066cc; /* Brand Blue */
    --text-main: #1a1a1a;
    --text-secondary: #666666;
    --bg-light: #f8f9fa;
    --border-gray: #e5e5e5;
    --white: #ffffff;
    --shadow-nav: 0 2px 10px rgba(0,0,0,0.05);
    --shadow-hover: 0 10px 30px rgba(0,0,0,0.1);
    --radius: 2px;
    --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.8;
    color: var(--text-main);
    background-color: var(--white);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

/* Navigation - Minimalist fixed header */
header {
    height: 80px;
    background: var(--white);
    box-shadow: var(--shadow-nav);
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo img {
    height: 32px;
    width: auto;
}

nav ul {
    display: flex;
    gap: 48px;
}

nav ul li a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-main);
    text-decoration: none;
}

nav ul li a:hover, nav ul li a.active {
    color: var(--primary-blue);
}

/* Hero Section - Bold & Clean */
.hero {
    padding: 160px 0 120px;
    background-color: var(--white);
}

.hero-content {
    max-width: 900px;
    text-align: left;
}

.hero h1 {
    font-size: 72px;
    font-weight: 300;
    line-height: 1.1;
    letter-spacing: -2px;
    margin-bottom: 32px;
    color: var(--text-main);
}

.hero p {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    max-width: 640px;
}

/* Section Common - Expansive Whitespace */
section {
    padding: 120px 0;
}

.section-bg-light {
    background-color: var(--bg-light);
}

.section-label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: var(--primary-blue);
    letter-spacing: 3px;
    margin-bottom: 24px;
    text-transform: uppercase;
}

.section-title h2 {
    font-size: 48px;
    font-weight: 300;
    margin-bottom: 72px;
    color: var(--text-main);
    letter-spacing: -1px;
}

/* Grid System - 1400px Container */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

/* Card Component - Refined Hover Effect */
.card {
    background: transparent;
    padding: 48px;
    transition: var(--transition);
    border-radius: var(--radius);
    border: none;
    text-decoration: none;
}

.card:hover {
    background: var(--white);
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.card-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 32px;
    stroke-width: 2px;
}

.card h3 {
    font-size: 24px;
    font-weight: 400;
    margin-bottom: 16px;
}

.card p {
    font-size: 16px;
    color: var(--text-secondary);
}

/* Button Component - SoftBank Standard */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    background-color: var(--primary-blue);
    color: var(--white);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn:hover {
    background-color: #0052a3;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,102,204,0.3);
}

/* Footer - Dark & Structured */
footer {
    background-color: #1a1a1a;
    color: var(--white);
    padding: 120px 0 60px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 80px;
    margin-bottom: 100px;
}

.footer-col h4 {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 40px;
    color: #888;
}

.footer-col ul li {
    margin-bottom: 18px;
}

.footer-col ul li a {
    font-size: 14px;
    color: #999;
    text-decoration: none;
}

.footer-col ul li a:hover {
    color: var(--white);
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 60px;
    text-align: center;
}

.footer-bottom p {
    font-size: 14px;
    color: #666;
}

/* Animation Reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Responsive - Multi-breakpoint */
@media (max-width: 1440px) {
    .container { max-width: 1200px; }
}

@media (max-width: 1024px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .hero h1 { font-size: 56px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
}

@media (max-width: 768px) {
    .grid-3, .grid-4, .footer-grid { grid-template-columns: 1fr; }
    nav ul { display: none; }
    .hero h1 { font-size: 40px; }
    section { padding: 80px 0; }
}