/* ============================================================
   KALPA JAPAN — Corporate Website
   Dark theme, CUD-considered palette, compact 2-page layout
   ============================================================ */

:root {
    --bg0: #0a0a0a;
    --bg1: #111111;
    --bg2: #1a1a1a;
    --bg3: #222222;
    --border: #2a2a2a;
    --border-strong: #3a3a3a;

    --text: #f2f2f2;
    --text-mid: #b8b8b8;
    --text-muted: #7a7a7a;

    --accent: #ff4d3d;
    --accent-soft: rgba(255, 77, 61, 0.18);
    --accent-amber: #f0a020;

    --max-w: 1280px;
    --gutter: 32px;

    --font-jp: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
    --font-en: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-jp);
    font-weight: 400;
    background: var(--bg1);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
html[lang="en"] body { font-family: var(--font-en); }

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* ============================================================
   Header — slim
   ============================================================ */
.site-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding-left: var(--gutter);
    padding-right: var(--gutter);
}
.header-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 12px 0;
    display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.logo-img { height: 28px; width: auto; }
.site-nav { display: flex; gap: 28px; flex: 1; justify-content: center; }
.site-nav a {
    font-size: 0.98rem; color: var(--text-mid);
    letter-spacing: 0.05em; transition: color 0.2s;
}
.site-nav a:hover { color: var(--text); }

/* Info Center — same look as nav links but visually separated from
   事業内容/お問い合わせ since access is restricted to registered customers. */
.info-center-link {
    font-size: 0.98rem;
    color: var(--text-mid);
    letter-spacing: 0.05em;
    transition: color 0.2s;
    margin: 0 18px 0 24px;
    white-space: nowrap;
}
.info-center-link:hover { color: var(--text); }

.lang-switch { display: flex; align-items: center; gap: 6px; font-size: 0.98rem; }
.lang-btn { color: var(--text-muted); padding: 4px 6px; transition: color 0.2s; letter-spacing: 0.08em; }
.lang-btn.active { color: #F0D080; font-weight: 500; }
.lang-btn:hover { color: var(--text); }
.lang-sep { color: var(--text-muted); }

/* ============================================================
   Hero — 1 viewport, with brand theme tagline
   ============================================================ */
.hero {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex; align-items: center; justify-content: center; text-align: center;
    padding: 80px var(--gutter) 60px;
    background:
        radial-gradient(ellipse at 50% 0%, rgba(255, 77, 61, 0.12), transparent 65%),
        linear-gradient(180deg, var(--bg0) 0%, var(--bg1) 100%);
    position: relative; overflow: hidden;
}
.hero-content { max-width: 1000px; position: relative; z-index: 2; }

.hero-eyebrow {
    font-family: var(--font-en);
    font-size: 0.98rem;
    color: var(--accent);
    letter-spacing: 0.35em;
    margin-bottom: 28px;
    font-weight: 500;
}

.hero-title {
    font-family: var(--font-en);
    font-size: clamp(2.4rem, 6.5vw, 5.6rem);
    font-weight: 200;
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 28px;
}
.hero-title span { display: block; }
.hero-title span:last-child {
    background: linear-gradient(90deg, #8B6F47, #C9A96E, #F0D080, #C9A96E, #8B6F47);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    font-size: clamp(0.98rem, 1.4vw, 1.15rem);
    color: var(--text-mid);
    margin-bottom: 36px;
    font-weight: 300;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}
.hero-cta {
    display: inline-block;
    padding: 14px 36px;
    border: 1px solid var(--text);
    color: var(--text);
    font-size: 0.98rem;
    letter-spacing: 0.1em;
    transition: all 0.3s;
}
.hero-cta:hover { background: var(--text); color: var(--bg0); }

/* ============================================================
   Section base — compact
   ============================================================ */
.section {
    padding: 64px var(--gutter);
}
.section-inner { max-width: var(--max-w); margin: 0 auto; }

.section-label {
    font-family: var(--font-en);
    font-size: 0.98rem;
    color: #F0D080;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    margin-bottom: 12px;
    font-weight: 500;
}
.section-title {
    font-size: clamp(1.5rem, 2.8vw, 2.2rem);
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 0;
    letter-spacing: 0.01em;
}

/* ============================================================
   About + Services (combined section)
   ============================================================ */
.section-about {
    background: var(--bg1);
    padding-top: 25vh;
    padding-bottom: 10vh;
}

/* Photo placeholder section */
.section-visual { background: var(--bg0); padding: 40px var(--gutter); }
.visual-inner { display: flex; justify-content: center; }
.visual-placeholder {
    width: 100%;
    min-height: 360px;
    background: var(--bg2);
    border: 1px dashed var(--border-strong);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.98rem;
    letter-spacing: 0.05em;
}
.about-head {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 16px;
    align-items: end;
    margin-bottom: 20px;
}
.about-head-text {
    padding-right: 24px;
    margin-left: -3px;
}
.about-head-body {
    color: var(--text-mid);
    font-size: 0.98rem;
    line-height: 1.85;
}

.services-heading {
    font-family: var(--font-en);
    font-size: 0.98rem;
    color: var(--text-muted);
    letter-spacing: 0.25em;
    text-transform: uppercase;
    margin-bottom: 16px;
    font-weight: 500;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    padding-top: 0;
}
.service-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    padding: 24px 20px;
    transition: all 0.3s;
}
.service-card:hover {
    border-color: #F0D080;
    background: var(--bg3);
    transform: translateY(-3px);
}
.service-num {
    font-family: var(--font-en);
    font-size: 0.98rem;
    color: #F0D080;
    letter-spacing: 0.15em;
    margin-bottom: 12px;
    font-weight: 500;
}
.service-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: 0.02em;
}
.service-desc {
    color: var(--text-mid);
    font-size: 0.98rem;
    line-height: 1.7;
}

/* ============================================================
   Service photos hover strip
   ============================================================ */
.services-photos {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-top: 12px;
}
.service-photo {
    overflow: hidden;
    height: 200px;
}
.service-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    filter: brightness(0.2);
    transition: filter 0.6s ease;
    display: block;
}
.service-photo.active img {
    filter: brightness(0.6);
}

/* ============================================================
   Contact + Company Info (side-by-side)
   ============================================================ */
.section-contact { background: var(--bg0); }
.contact-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 56px;
    align-items: start;
}
.contact-col, .info-col { min-width: 0; }

.contact-col .section-title { margin-bottom: 24px; }

.contact-form { display: flex; flex-direction: column; gap: 14px; }
.form-row-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}
.form-row { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.form-row label {
    font-size: 0.98rem;
    color: var(--text-mid);
    letter-spacing: 0.05em;
}
.form-row input,
.form-row textarea {
    background: var(--bg2);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 10px 12px;
    font-size: 0.98rem;
    font-family: inherit;
    border-radius: 2px;
    transition: border-color 0.2s, background 0.2s;
    width: 100%;
}
.form-row input:focus,
.form-row textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--bg3);
}
.form-row textarea { resize: vertical; min-height: 100px; }

.form-submit {
    align-self: flex-end;
    padding: 12px 36px;
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    font-size: 0.98rem;
    letter-spacing: 0.1em;
    transition: background 0.2s, color 0.2s, transform 0.2s;
    margin-top: 4px;
    border-radius: 2px;
    font-weight: 500;
}
.form-submit:hover { background: var(--accent); color: #fff; }
.form-submit:active { transform: scale(0.98); }
.form-submit:disabled { opacity: 0.5; cursor: not-allowed; }

.form-result {
    padding: 10px 12px;
    border-radius: 2px;
    font-size: 0.98rem;
}
.form-result.success {
    background: rgba(50, 160, 100, 0.15);
    border: 1px solid #32a064;
    color: #6fd49a;
}
.form-result.error {
    background: var(--accent-soft);
    border: 1px solid var(--accent);
    color: #ff8b85;
}

/* Company Info table */
.info-col .section-label { margin-bottom: 16px; }
.info-table { width: 100%; border-collapse: collapse; }
.info-table th, .info-table td {
    text-align: left;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.98rem;
    vertical-align: top;
}
.info-table th {
    width: 110px;
    color: var(--text-muted);
    font-weight: 400;
    letter-spacing: 0.05em;
    padding-right: 12px;
}
.info-table td { color: var(--text); }

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
    background: var(--bg0);
    padding: 28px var(--gutter);
}
.footer-inner {
    max-width: var(--max-w);
    margin: 0 auto;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-end;
    gap: 16px;
}
.footer-logo { height: 22px; opacity: 0.7; }
.footer-copy {
    font-size: 0.98rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    font-family: var(--font-en);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 960px) {
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .services-photos { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr; gap: 48px; }
    .about-head { grid-template-columns: 1fr; gap: 16px; }
}
@media (max-width: 768px) {
    :root { --gutter: 20px; }
    .header-inner { padding: 10px 0; gap: 12px; }
    .logo-img { height: 24px; }
    .site-nav { display: none; }

    .hero { padding: 90px var(--gutter) 50px; }
    .hero-eyebrow { margin-bottom: 20px; letter-spacing: 0.25em; }
    .hero-title { margin-bottom: 20px; }
    .hero-sub { margin-bottom: 28px; }

    .section { padding: 48px var(--gutter); }
    .services-grid { grid-template-columns: 1fr; gap: 12px; }
    .services-photos { grid-template-columns: 1fr; }
    .service-photo { height: 160px; }
    .service-card { padding: 20px 18px; }

    .form-row-2col { grid-template-columns: 1fr; gap: 14px; }

    .info-table th, .info-table td { display: block; width: 100%; }
    .info-table th { padding: 12px 0 4px; border-bottom: none; }
    .info-table td { padding: 0 0 12px; }

    .footer-inner { flex-direction: column; }
}