/* ===========================================================
   Water Coach — marketing site styles
   Calm, friendly hydration theme.
   =========================================================== */

:root {
  --blue-50: #eef7ff;
  --blue-100: #d7ecff;
  --blue-200: #b3d9ff;
  --blue-300: #7cbdff;
  --blue-400: #4a9eff;
  --blue-500: #1f86f0;
  --blue-600: #0f6ad1;
  --blue-700: #0d54a3;
  --ink-900: #0b2540;
  --ink-700: #234b6e;
  --ink-500: #51708c;
  --ink-400: #6f8aa3;
  --bg: #f7fbff;
  --card: #ffffff;
  --border: #e2edf7;
  --shadow: 0 10px 30px rgba(15, 106, 209, 0.10);
  --shadow-lg: 0 24px 60px rgba(15, 106, 209, 0.18);
  --radius: 18px;
  --radius-sm: 12px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink-900);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--blue-600); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; height: auto; display: block; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(14px);
  background: rgba(247, 251, 255, 0.82);
  border-bottom: 1px solid var(--border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 18px;
  color: var(--ink-900);
}
.brand:hover { text-decoration: none; }
.brand img {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  box-shadow: 0 2px 8px rgba(15, 106, 209, 0.25);
}
.header-actions { display: flex; align-items: center; gap: 14px; }
.nav-links { display: flex; gap: 22px; }
.nav-links a {
  color: var(--ink-700);
  font-size: 14.5px;
  font-weight: 600;
}

/* ---------- Language toggle ---------- */
.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  overflow: hidden;
}
.lang-toggle a {
  border: 0;
  background: transparent;
  padding: 6px 13px;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-400);
  cursor: pointer;
  transition: all .15s ease;
  text-decoration: none;
}
.lang-toggle a:hover { text-decoration: none; }
.lang-toggle a.active {
  background: var(--blue-500);
  color: #fff;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .12s ease, box-shadow .2s ease, background .2s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(180deg, var(--blue-500), var(--blue-600));
  color: #fff;
  box-shadow: var(--shadow);
}
.btn-primary:hover { box-shadow: var(--shadow-lg); }
.btn-ghost {
  background: #fff;
  color: var(--blue-600);
  border-color: var(--border);
}
.btn[aria-disabled="true"] {
  opacity: .55;
  pointer-events: none;
  filter: grayscale(.2);
}
.btn svg { width: 20px; height: 20px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 84px 0 72px;
  background:
    radial-gradient(1200px 500px at 80% -10%, var(--blue-100), transparent 60%),
    radial-gradient(900px 500px at 0% 10%, #e8f4ff, transparent 55%);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1.18;
  margin: 14px 0 18px;
  letter-spacing: -0.01em;
}
.hero .lead {
  font-size: clamp(16px, 2.1vw, 19px);
  color: var(--ink-700);
  max-width: 30em;
  margin: 0 0 28px;
}
.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--blue-600);
  background: var(--blue-50);
  border: 1px solid var(--blue-100);
  padding: 6px 12px;
  border-radius: 999px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.hero-note { font-size: 13px; color: var(--ink-400); margin-top: 14px; }

/* Phone mockup in hero */
.hero-visual { display: flex; justify-content: center; }
.phone {
  position: relative;
  width: 270px;
  border-radius: 42px;
  padding: 12px;
  background: linear-gradient(160deg, #1b2c3e, #0b1722);
  box-shadow: var(--shadow-lg);
}
.phone::before {
  content: "";
  position: absolute;
  top: 18px; left: 50%;
  transform: translateX(-50%);
  width: 96px; height: 22px;
  background: #0b1722;
  border-radius: 0 0 14px 14px;
  z-index: 2;
}
.phone img {
  border-radius: 32px;
  width: 100%;
  display: block;
}

/* ---------- Sections ---------- */
section { padding: 72px 0; }
.section-head { text-align: center; max-width: 38em; margin: 0 auto 44px; }
.section-head h2 {
  font-size: clamp(26px, 3.5vw, 36px);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.section-head p { color: var(--ink-700); font-size: 17px; margin: 0; }

.alt { background: linear-gradient(180deg, #fff, var(--blue-50)); }

/* ---------- Features ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .2s ease;
}
.feature:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.feature .icon {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  border-radius: 14px;
  background: var(--blue-50);
  color: var(--blue-600);
  margin-bottom: 16px;
}
.feature .icon svg { width: 26px; height: 26px; }
.feature h3 { margin: 0 0 8px; font-size: 18px; }
.feature p { margin: 0; color: var(--ink-700); font-size: 15px; }

/* ---------- Screenshot gallery ---------- */
.shots {
  display: flex;
  gap: 22px;
  overflow-x: auto;
  padding: 8px 4px 24px;
  scroll-snap-type: x mandatory;
}
.shot {
  flex: 0 0 auto;
  width: 230px;
  scroll-snap-align: center;
}
.shot img {
  width: 100%;
  border-radius: 26px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.shot p {
  text-align: center;
  margin: 14px 0 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-700);
}

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(160deg, var(--blue-500), var(--blue-700));
  color: #fff;
  border-radius: 28px;
  padding: 54px 40px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.cta-band h2 { font-size: clamp(24px, 3.5vw, 34px); margin: 0 0 12px; }
.cta-band p { color: var(--blue-100); margin: 0 0 26px; font-size: 17px; }
.cta-band .btn-primary {
  background: #fff;
  color: var(--blue-700);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  background: #fff;
  padding: 48px 0 36px;
  margin-top: 24px;
}
.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 28px;
}
.footer-brand { max-width: 22em; }
.footer-brand .brand { margin-bottom: 12px; }
.footer-brand p { color: var(--ink-400); font-size: 14px; margin: 0; }
.footer-col h4 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--ink-400);
  margin: 0 0 14px;
}
.footer-col a {
  display: block;
  color: var(--ink-700);
  font-size: 14.5px;
  margin-bottom: 10px;
  font-weight: 500;
}
.footer-bottom {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  color: var(--ink-400);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- Legal / content pages ---------- */
.page-hero {
  background:
    radial-gradient(900px 360px at 85% -20%, var(--blue-100), transparent 60%);
  padding: 56px 0 28px;
  border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 8px; }
.page-hero .updated { color: var(--ink-400); font-size: 14px; }
.breadcrumb { font-size: 13px; color: var(--ink-400); margin-bottom: 14px; }
.breadcrumb a { color: var(--ink-500); }

.legal {
  max-width: 760px;
  margin: 0 auto;
  padding: 44px 20px 72px;
}
.legal h2 {
  font-size: 21px;
  margin: 38px 0 12px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}
.legal h2:first-of-type { border-top: 0; padding-top: 0; margin-top: 8px; }
.legal h3 { font-size: 16px; margin: 22px 0 8px; color: var(--ink-700); }
.legal p { color: var(--ink-700); }
.legal ul { color: var(--ink-700); padding-left: 22px; }
.legal li { margin: 6px 0; }
.legal .intro { font-size: 17px; color: var(--ink-900); }
.callout {
  background: var(--blue-50);
  border: 1px solid var(--blue-100);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  color: var(--ink-700);
  font-size: 14.5px;
  margin: 18px 0;
}

/* ---------- Contact page ---------- */
.contact-card {
  max-width: 640px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 38px 34px;
  text-align: center;
}
.contact-card .icon {
  width: 64px; height: 64px;
  margin: 0 auto 18px;
  display: grid; place-items: center;
  border-radius: 18px;
  background: var(--blue-50);
  color: var(--blue-600);
}
.contact-card h2 { margin: 0 0 10px; }
.contact-card p { color: var(--ink-700); margin: 0 0 24px; }
.contact-meta {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--ink-500);
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; text-align: center; gap: 36px; }
  .hero .lead { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .features { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}
@media (max-width: 560px) {
  section { padding: 56px 0; }
  .cta-band { padding: 40px 22px; }
  .phone { width: 230px; }
}