/* =========================
   BIP Solution – styles.css
   ========================= */

/* ===== CSS Variables ===== */
:root {
  --bg: #0f172a;           /* slate-900 */
  --panel: #111827;        /* gray-900 */
  --muted: #94a3b8;        /* slate-400 */
  --text: #e5e7eb;         /* gray-200 */
  --brand: #2563eb;        /* blue-600 */
  --brand-2: #38bdf8;      /* sky-400 */
  --accent: #f59e0b;       /* amber-500 */
  --card: #0b1220;         /* custom */
  --ring: rgba(56,189,248,.35);
  --maxw: 1100px;
  --radius-xl: 18px;
  --shadow: 0 10px 30px rgba(0,0,0,.25);
}

/* ===== Base ===== */
*, *::before, *::after { box-sizing: border-box; }
html:focus-within { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", "Yu Gothic", "Meiryo", sans-serif;
  background: radial-gradient(1200px 600px at 100% -10%, #0b2747 0%, var(--bg) 45%),
              radial-gradient(900px 500px at -10% 10%, #121a2a 0%, var(--bg) 60%);
  color: var(--text);
  line-height: 1.65;
}
a { color: var(--brand-2); text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(100% - 2rem, var(--maxw)); margin-inline: auto; }

/* ===== Header / Nav ===== */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(9, 14, 24, .65);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(148,163,184,.12);
}
.nav { display: flex; align-items: center; gap: 1rem; padding: .75rem 0; }
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 700; letter-spacing: .2px; }
.brand .logo { width: 28px; height: 28px; border-radius: 8px; background: linear-gradient(135deg, var(--brand) 0%, var(--brand-2) 100%); box-shadow: inset 0 0 0 2px rgba(255,255,255,.15); }
nav { margin-left: auto; display: flex; gap: .5rem; flex-wrap: wrap; }
.nav a { padding: .45rem .75rem; border-radius: 999px; color: var(--text); opacity: .85; }
.nav a:hover, .nav a:focus { background: rgba(37,99,235,.12); outline: none; opacity: 1; }
.cta { background: linear-gradient(90deg, var(--brand) 0%, var(--brand-2) 100%); color: white !important; box-shadow: var(--shadow); }

/* ===== Hero ===== */
.hero { position: relative; isolation: isolate; padding: 64px 0 48px; overflow: hidden; }
.hero-grid { display: grid; gap: 2rem; grid-template-columns: 1fr; align-items: center; }
.kpi { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: .75rem; margin-top: 1.25rem; }
.kpi .card { background: linear-gradient(180deg, rgba(148,163,184,.08), rgba(148,163,184,.03)); border: 1px solid rgba(148,163,184,.18); padding: .9rem; border-radius: var(--radius-xl); text-align: center; }
.hero h1 { font-size: clamp(1.8rem, 2.8vw + 1rem, 3rem); line-height: 1.15; margin: 0; }
.lead { color: var(--muted); font-size: 1.05rem; }
.hero-cta { display: flex; gap: .75rem; flex-wrap: wrap; margin-top: 1.25rem; }
.btn { display:inline-flex; align-items:center; gap:.5rem; padding:.85rem 1rem; border-radius: 12px; border:1px solid rgba(148,163,184,.18); background:#111827; color:var(--text); }
.btn:hover { border-color: rgba(56,189,248,.45); box-shadow: 0 0 0 3px var(--ring); }

/* ===== Sections ===== */
section { padding: 56px 0; }
.section-title { font-size: clamp(1.4rem, 1.2vw + 1rem, 2rem); margin: 0 0 .5rem; }
.section-sub { color: var(--muted); margin: 0 0 1.25rem; }

/* ===== Services ===== */
.services { display: grid; grid-template-columns: repeat(1, minmax(0,1fr)); gap: 1rem; }
.service-card { background: var(--card); border: 1px solid rgba(148,163,184,.15); border-radius: var(--radius-xl); padding: 1.1rem; box-shadow: var(--shadow); }
.service-card h3 { margin:.2rem 0 .35rem; font-size: 1.05rem; }
.service-meta { color: var(--muted); font-size: .95rem; }

/* ===== Experience Timeline ===== */
.timeline { position: relative; margin-top: 1rem; }
.timeline::before { content: ""; position: absolute; left: 10px; top: 0; bottom: 0; width: 2px; background: linear-gradient(to bottom, var(--brand-2), rgba(56,189,248,0)); }
.event { position: relative; margin-left: 34px; padding: .6rem .9rem; background: linear-gradient(180deg, rgba(148,163,184,.07), rgba(148,163,184,.02)); border: 1px solid rgba(148,163,184,.18); border-radius: 12px; }
.event::before { content: ""; position: absolute; left: -26px; top: .9rem; width: 14px; height: 14px; border-radius: 50%; background: var(--brand-2); box-shadow: 0 0 0 3px rgba(56,189,248,.2); }
.event h4 { margin: 0 0 .25rem; font-size: 1rem; }
.event small { color: var(--muted); }

/* ===== Portfolio ===== */
.portfolio { display: grid; grid-template-columns: repeat(1, minmax(0,1fr)); gap: 1rem; }
.work { background: var(--card); border: 1px solid rgba(148,163,184,.15); border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow); }
.work .thumbtop { aspect-ratio: 16/9; background: linear-gradient(90deg, #0b2a4a, #173d66); display:flex; align-items:center; justify-content:center; color:#cbd5e1; font-weight:600; }
.work .thumb { aspect-ratio: 16/9; background: linear-gradient(90deg, #0b2a4a, #173d66); display:flex; align-items:center; justify-content:center; color:#cbd5e1; font-weight:600; }
.work .body { padding: 1rem; }
.tags { display:flex; gap:.5rem; flex-wrap:wrap; margin-top:.35rem; }
.tag { font-size:.8rem; padding:.2rem .5rem; border-radius:999px; background:rgba(37,99,235,.15); color:#cfe6ff; border:1px solid rgba(56,189,248,.25); }

/* ===== Reasons ===== */
.reasons { display:grid; grid-template-columns: repeat(1, minmax(0,1fr)); gap:1rem; }
.reason { background: linear-gradient(180deg, rgba(245,158,11,.08), rgba(245,158,11,.03)); border:1px solid rgba(245,158,11,.25); border-radius: var(--radius-xl); padding:1rem; }

/* ===== Contact ===== */
.contact { display:grid; grid-template-columns: 1fr; gap:1rem; }
.form { background: var(--card); border:1px solid rgba(148,163,184,.18); border-radius: var(--radius-xl); padding:1rem; box-shadow: var(--shadow); }
label { display:block; font-weight:600; margin:.3rem 0; }
input, textarea { width:100%; padding:.8rem; border-radius:12px; border:1px solid rgba(148,163,184,.25); background:#0a1220; color:var(--text); }
input:focus, textarea:focus { outline:none; border-color: var(--brand-2); box-shadow: 0 0 0 3px var(--ring); }
textarea { min-height: 140px; resize: vertical; }

/* ===== Footer ===== */
footer { padding: 40px 0; color: var(--muted); border-top: 1px solid rgba(148,163,184,.12); background: #0b0f1a; }

/* ===== Media Queries ===== */
@media (min-width: 720px) {
  .hero { padding: 84px 0 64px; }
  .hero-grid { grid-template-columns: 1.1fr .9fr; }
  .services { grid-template-columns: repeat(4, minmax(0,1fr)); }
  .portfolio { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .reasons { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .contact { grid-template-columns: 1.2fr .8fr; align-items: start; }
}