/* 
   Kyuliz Home - Minimal & Professional Design
   Focus: Typography, Whitespace, Off-white Theme
*/

:root {
    /* Colors */
    --bg-body: #1a1a1a;
    --bg-surface: #2a2a2a;

    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #999999;
    --text-accent: #94a3b8;

    --border-color: #444444;

    /* Typography */
    --font-jp: 'Noto Sans JP', sans-serif;
    --font-en: 'Inter', sans-serif;

    /* Spacing */
    --section-padding: 120px;
    --container-max: 1000px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-body);
    color: var(--text-primary);
    font-family: var(--font-jp);
    font-size: 16px;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1,
h2,
h3,
h4,
.logo {
    font-family: var(--font-en);
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
}

/* Header */
.header {
    padding: 32px 0;
    background-color: var(--bg-body);
    border-bottom: 1px solid var(--border-color);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
}

.nav {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    transition: color 0.2s;
}

.nav a:hover {
    color: var(--text-primary);
}

.btn-cta {
    color: var(--text-accent) !important;
    font-weight: 500 !important;
}

/* Buttons */
.btn-primary {
    display: inline-block;
    padding: 16px 40px;
    background-color: #ffffff;
    color: #000000;
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: opacity 0.2s;
}

.btn-primary:hover {
    opacity: 0.85;
}

.btn-large {
    padding: 20px 50px;
    font-size: 1rem;
}

/* Sections */
.section {
    padding: var(--section-padding) 0;
}

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-accent);
    font-weight: 500;
    margin-bottom: 24px;
}

.section-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 80px;
}

/* Hero */
.hero {
    padding: 140px 0 120px;
    text-align: left;
}

.hero-title {
    font-size: clamp(3.5rem, 8vw, 7rem);
    font-weight: 600;
    margin-bottom: 32px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 48px;
    font-weight: 400;
}

/* Hook Section */
.hook-section {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.hook-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 80px;
}

.hook-item h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    font-weight: 600;
}

.hook-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Features */
.features-section {
    background-color: var(--bg-body);
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 100px;
}

.feature-item h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-accent);
    margin-bottom: 16px;
    font-weight: 500;
}

.feature-item h4 {
    font-size: 2rem;
    margin-bottom: 20px;
    line-height: 1.4;
}

.feature-item p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    max-width: 600px;
    line-height: 1.8;
}

/* USP */
.usp-section {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
}

.usp-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 60px;
}

.usp-item {
    text-align: left;
}

.usp-number {
    font-size: 0.75rem;
    font-family: var(--font-en);
    color: var(--text-muted);
    margin-bottom: 24px;
    letter-spacing: 2px;
}

.usp-item h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.usp-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* FAQ */
.faq-section {
    background-color: var(--bg-body);
}

.faq-list {
    max-width: 700px;
    display: flex;
    flex-direction: column;
    gap: 1px;
    background-color: var(--border-color);
}

.faq-item {
    background-color: var(--bg-surface);
}

.faq-question {
    padding: 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
    font-size: 1rem;
}

.faq-toggle {
    font-size: 1.5rem;
    color: var(--text-accent);
    transition: transform 0.3s;
    font-weight: 300;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.faq-item.active .faq-answer {
    padding: 0 32px 32px;
}

/* CTA */
.cta-section {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.cta-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 32px;
}

.cta-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 48px;
    line-height: 1.8;
}

.cta-note {
    margin-top: 24px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Footer */
.footer {
    padding: 80px 0 40px;
    background-color: var(--bg-body);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 40px;
}

.footer-brand p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 8px;
}

.footer-nav {
    display: flex;
    gap: 32px;
}

.footer-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
}

.footer-nav a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 900px) {
    :root {
        --section-padding: 80px;
    }

    .nav {
        display: none;
        /* Simplified - could add mobile menu */
    }

    .hook-grid {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .usp-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-content {
        flex-direction: column;
        gap: 32px;
    }
}

@media (max-width: 600px) {
    :root {
        --section-padding: 60px;
    }

    .container {
        padding: 0 24px;
    }

    .hero {
        padding: 100px 0 80px;
    }
}