:root {
    --bg-color: #ffffff;
    --text-color: #1d1d1f;
    --text-muted: #86868b;
    --border-color: #d2d2d7;
    --pastel-orange: #ffe8cc;
    --pastel-blue: #d6f0ff;
    --pastel-green: #d1f4d9;
    --journal-beige: #f5f5f0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.serif {
    font-family: 'Playfair Display', "Times New Roman", Times, serif;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 32px;
}

/* Header */
header {
    text-align: center;
    padding: 140px 0 100px;
    position: relative;
    overflow: hidden;
}

.logo-img {
    width: 80px;
    height: auto;
    margin-bottom: 32px;
}

h1 {
    font-size: 5rem;
    font-weight: 400;
    margin: 0 0 16px;
    letter-spacing: -0.01em;
    color: #000;
}
.page-title {
    font-size: 3.5rem;
    margin-bottom: 24px;
}

.tagline {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-muted);
    margin-bottom: 8px;
    letter-spacing: 0.02em;
}

.tagline-ja {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 56px;
    letter-spacing: 0.05em;
}

.app-store-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #000;
    color: #fff;
    padding: 14px 28px;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.app-store-btn:hover {
    transform: scale(1.03);
    background: #1d1d1f;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

/* Concept & Philosophy */
.concept-section, .philosophy-section, .content-section {
    padding: 100px 0;
    text-align: center;
}
.concept-section {
    background-color: #fbfbfd;
    margin-bottom: 100px;
}
.philosophy-section {
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.concept-title {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 32px;
    letter-spacing: -0.02em;
}

.concept-text {
    font-size: 1.25rem;
    color: #555;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.8;
}

.interactive-word {
    display: inline-block;
    transition: background-color 0.4s ease, color 0.4s ease;
    padding: 0 4px;
    border-radius: 4px;
    cursor: default;
}
.interactive-word:hover { background-color: var(--pastel-orange); color: #000; }
.interactive-word.blue:hover { background-color: var(--pastel-blue); }
.interactive-word.green:hover { background-color: var(--pastel-green); }

/* Features Grid */
.features-header {
    text-align: center;
    margin-bottom: 80px;
}
.features-header h2 {
    font-size: 3rem;
    font-weight: 400;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    padding-bottom: 140px;
}
.feature-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 48px;
    transition: all 0.5s ease;
    position: relative;
    overflow: hidden;
}
.feature-card:hover {
    border-color: transparent;
    box-shadow: 0 24px 48px rgba(0,0,0,0.06);
    transform: translateY(-8px);
}
.feature-card:nth-child(1):hover { background-color: var(--journal-beige); }
.feature-card:nth-child(2):hover { background-color: var(--pastel-blue); }
.feature-card:nth-child(3):hover { background-color: var(--pastel-orange); }
.feature-card:nth-child(4):hover { background-color: #f7f7f9; }
.feature-card:nth-child(5):hover { background-color: var(--pastel-green); }
.feature-card:nth-child(6):hover { background-color: #fafafa; }

.feature-num {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 24px;
    display: block;
}
.feature-title {
    font-size: 2rem;
    font-weight: 600;
    margin: 0 0 16px;
    letter-spacing: -0.01em;
}
.feature-desc {
    font-size: 1.1rem;
    color: #555;
    line-height: 1.7;
    margin: 0;
}

/* Weather Chips */
.weather-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}
.chip {
    padding: 8px 16px;
    border: 1px solid #000;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s;
    cursor: pointer;
}
.chip:hover { background-color: #000; color: #fff; }
.chip.active-orange { background-color: var(--pastel-orange); border-color: var(--pastel-orange); color: #000; }
.chip.active-blue { background-color: var(--pastel-blue); border-color: var(--pastel-blue); color: #000; }
.chip.active-green { background-color: var(--pastel-green); border-color: var(--pastel-green); color: #000; }

/* Subpage Specific */
.content-wrapper {
    max-width: 680px;
    margin: 0 auto;
    text-align: left;
    padding-bottom: 100px;
}
.content-wrapper h2 {
    font-size: 1.5rem;
    margin-top: 60px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}
.content-wrapper h3 {
    font-size: 1.2rem;
    margin-top: 32px;
    margin-bottom: 8px;
    color: #000;
}
.content-wrapper p, .content-wrapper li {
    font-size: 1.1rem;
    color: #444;
    line-height: 1.8;
    margin-bottom: 16px;
}

/* FAQ Styles */
.faq-item {
    margin-bottom: 32px;
}
.faq-q {
    font-weight: 600;
    font-size: 1.15rem;
    color: #000;
    margin-bottom: 8px;
    display: flex;
}
.faq-q::before {
    content: 'Q.';
    color: var(--text-muted);
    margin-right: 12px;
    font-family: 'Playfair Display', serif;
    font-size: 1.3rem;
}
.faq-a {
    font-size: 1.05rem;
    color: #555;
    display: flex;
    line-height: 1.7;
}
.faq-a::before {
    content: 'A.';
    color: var(--text-muted);
    margin-right: 12px;
    font-family: 'Playfair Display', serif;
    font-size: 1.3rem;
}

/* Form Styles */
.form-group {
    margin-bottom: 24px;
}
.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 0.95rem;
}
.form-control {
    width: 100%;
    padding: 16px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    font-family: inherit;
    box-sizing: border-box;
    transition: border-color 0.3s ease;
}
.form-control:focus {
    outline: none;
    border-color: #000;
}
textarea.form-control {
    resize: vertical;
    min-height: 150px;
}
.submit-btn {
    width: 100%;
    background: #000;
    color: #fff;
    padding: 16px;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
}
.submit-btn:hover {
    background: #333;
}

/* Footer */
footer {
    padding: 60px 0;
    text-align: center;
    font-size: 0.95rem;
    color: var(--text-muted);
}
.footer-links {
    margin-bottom: 24px;
    display: flex;
    justify-content: center;
    gap: 32px;
}
.footer-links a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
}
.footer-links a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    h1 { font-size: 3.5rem; }
    .features-grid { grid-template-columns: 1fr; }
    .concept-title { font-size: 2rem; }
    .page-title { font-size: 2.5rem; }
    .footer-links { flex-direction: column; gap: 16px; }
}