/* Abyss — dark ocean theme */

:root {
  color-scheme: dark;
  /* surfaces */
  --bg-deep: #060d18;
  --bg-page: #081120;
  --surface-1: #0c1626;      /* cards / chart surface (palette validated against this) */
  --surface-2: #11203a;
  --surface-3: #16294a;
  /* ink */
  --ink-primary: #f2f5f9;
  --ink-secondary: #aab6c6;
  --ink-muted: #7c8aa0;
  --grid: #1c2b42;
  --axis: #2b3d5c;
  --border: rgba(148, 184, 230, 0.14);
  /* brand */
  --accent: #2dd4ea;
  --accent-deep: #0e7d9e;
  --series-blue: #3987e5;
  --series-orange: #d95926;
  --series-green: #199e70;
  --series-yellow: #c98500;
  /* status (icon + label always accompany color) */
  --status-good: #0ca30c;
  --status-warning: #fab219;
  --status-serious: #ec835a;
  --status-critical: #d03b3b;

  --radius: 14px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
  --font: system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

/* the hidden attribute must beat any explicit display value below */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: var(--font);
  color: var(--ink-primary);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(14, 125, 158, 0.28), transparent 60%),
    radial-gradient(900px 500px at 10% 10%, rgba(57, 135, 229, 0.16), transparent 55%),
    linear-gradient(180deg, var(--bg-page) 0%, var(--bg-deep) 100%);
  background-attachment: fixed;
  line-height: 1.5;
}

/* ---------------------------- ocean backdrop --------------------------- */

.ocean-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.bubbles::before, .bubbles::after {
  content: "";
  position: absolute;
  inset: -10% -5%;
  background-image:
    radial-gradient(circle 4px at 12% 110%, rgba(120, 200, 255, .18) 60%, transparent 62%),
    radial-gradient(circle 3px at 34% 115%, rgba(120, 200, 255, .13) 60%, transparent 62%),
    radial-gradient(circle 6px at 58% 108%, rgba(120, 200, 255, .10) 60%, transparent 62%),
    radial-gradient(circle 2.5px at 73% 112%, rgba(120, 200, 255, .16) 60%, transparent 62%),
    radial-gradient(circle 5px at 90% 118%, rgba(120, 200, 255, .12) 60%, transparent 62%);
  animation: rise 26s linear infinite;
}
.bubbles::after {
  background-image:
    radial-gradient(circle 3px at 22% 112%, rgba(120, 200, 255, .12) 60%, transparent 62%),
    radial-gradient(circle 5px at 47% 116%, rgba(120, 200, 255, .10) 60%, transparent 62%),
    radial-gradient(circle 2px at 66% 109%, rgba(120, 200, 255, .17) 60%, transparent 62%),
    radial-gradient(circle 4px at 82% 114%, rgba(120, 200, 255, .11) 60%, transparent 62%);
  animation-duration: 38s;
  animation-delay: -12s;
}
@keyframes rise {
  from { transform: translateY(0); }
  to   { transform: translateY(-118vh); }
}
@media (prefers-reduced-motion: reduce) {
  .bubbles::before, .bubbles::after { animation: none; }
}

/* ------------------------------- topbar -------------------------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  padding: 0.7rem clamp(1rem, 4vw, 2.4rem);
  background: rgba(6, 13, 24, 0.75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--accent);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.28em;
  font-size: 1.05rem;
}

.nav {
  display: flex;
  gap: 0.2rem;
  flex: 1;
  overflow-x: auto;
}
.nav a {
  color: var(--ink-secondary);
  text-decoration: none;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-size: 0.95rem;
  white-space: nowrap;
  transition: color .15s, background .15s;
}
.nav a:hover { color: var(--ink-primary); background: rgba(148, 184, 230, 0.08); }
.nav a.active { color: #06121f; background: var(--accent); font-weight: 650; }

/* -------------------------------- layout ------------------------------- */

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 2rem);
}

.view { display: none; }
.view.active { display: block; animation: fadein .25s ease; }
@keyframes fadein { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; } }

.page-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0.4rem 0 1.2rem;
  letter-spacing: 0.01em;
}
.page-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.page-actions { display: flex; gap: 0.5rem; }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  margin-top: 1.2rem;
}
.grid-planner {
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 1.2rem;
  align-items: start;
}
@media (max-width: 900px) {
  .grid-2, .grid-planner { grid-template-columns: 1fr; }
}

.card {
  background: linear-gradient(180deg, rgba(23, 42, 74, 0.55), rgba(12, 22, 38, 0.9));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.3rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.2rem;
}
.card h2 {
  margin: 0 0 0.7rem;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-muted);
}
.card-hint { color: var(--ink-secondary); font-size: 0.9rem; margin: 0.2rem 0 0.8rem; }
.mt { margin-top: 1.4rem; }
.empty { color: var(--ink-muted); text-align: center; padding: 2rem 1rem; }

/* --------------------------------- hero -------------------------------- */

.hero {
  padding: clamp(2rem, 6vw, 4.5rem) 0 clamp(1.4rem, 3vw, 2.4rem);
  max-width: 720px;
}
.hero-title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.05;
  margin: 0 0 1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, #eaf6ff 30%, var(--accent) 75%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub { color: var(--ink-secondary); font-size: 1.06rem; max-width: 58ch; margin: 0 0 1.6rem; }
.hero-actions { display: flex; gap: 0.8rem; flex-wrap: wrap; }

/* ------------------------------- buttons ------------------------------- */

.btn {
  font: inherit;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 0.55rem 1.1rem;
  cursor: pointer;
  color: var(--ink-primary);
  background: var(--surface-2);
  transition: transform .12s, background .15s, border-color .15s;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary {
  background: linear-gradient(120deg, var(--accent) 0%, #1e9ec4 100%);
  color: #05121d;
  font-weight: 700;
}
.btn-outline { background: transparent; border-color: var(--accent-deep); color: var(--accent); }
.btn-outline:hover { background: rgba(45, 212, 234, 0.08); }
.btn-ghost { background: transparent; color: var(--ink-secondary); }
.btn-ghost:hover { color: var(--ink-primary); background: rgba(148, 184, 230, 0.08); }
.btn-danger { background: transparent; border-color: var(--status-critical); color: #f0908f; }
.btn-danger:hover { background: rgba(208, 59, 59, 0.12); }
.btn-lg { padding: 0.8rem 1.5rem; font-size: 1.02rem; border-radius: 12px; }
.btn-sm { padding: 0.35rem 0.8rem; font-size: 0.88rem; }
.btn-block { display: block; width: 100%; }
.btn-icon { padding: 0.2rem 0.5rem; background: transparent; color: var(--ink-muted); }
.btn-icon:hover { color: var(--status-critical); }
.btn-install { border-color: var(--accent-deep); color: var(--accent); }

/* -------------------------------- tiles -------------------------------- */

.tile-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.8rem;
  margin: 1rem 0;
}
.tile {
  background: rgba(17, 32, 58, 0.6);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.tile-value { font-size: 1.45rem; font-weight: 750; letter-spacing: -0.01em; }
.tile-label { font-size: 0.78rem; color: var(--ink-muted); text-transform: uppercase; letter-spacing: 0.1em; }

/* -------------------------------- forms -------------------------------- */

.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
}
label { display: flex; flex-direction: column; gap: 0.25rem; font-size: 0.85rem; color: var(--ink-secondary); }
input, select {
  font: inherit;
  color: var(--ink-primary);
  background: var(--bg-deep);
  border: 1px solid var(--axis);
  border-radius: 8px;
  padding: 0.45rem 0.6rem;
  min-width: 0;
}
input:focus, select:focus { outline: 2px solid var(--accent-deep); border-color: transparent; }

.check { flex-direction: row; align-items: center; gap: 0.5rem; margin: 0.4rem 0; font-size: 0.92rem; }
.check input { width: 1.05rem; height: 1.05rem; accent-color: var(--accent); }

.row-list { display: flex; flex-direction: column; gap: 0.55rem; margin-bottom: 0.6rem; }
.row {
  display: flex;
  gap: 0.6rem;
  align-items: flex-end;
  flex-wrap: wrap;
  padding: 0.6rem;
  background: rgba(6, 13, 24, 0.5);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.row label { flex: 1 1 90px; }
.row-note { color: var(--ink-muted); font-size: 0.8rem; padding-bottom: 0.5rem; white-space: nowrap; }

/* ------------------------------- alerts -------------------------------- */

.alert {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  border-radius: 10px;
  padding: 0.7rem 0.9rem;
  margin: 0.5rem 0;
  font-size: 0.92rem;
  border: 1px solid;
}
.alert-warning { border-color: var(--status-warning); background: rgba(250, 178, 25, 0.09); color: #ffe1a3; }
.alert-critical { border-color: var(--status-critical); background: rgba(208, 59, 59, 0.12); color: #ffb9b8; }
.alert-icon { line-height: 1.4; }

/* -------------------------------- tables ------------------------------- */

.table-scroll { overflow-x: auto; }
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
}
.table th {
  text-align: left;
  color: var(--ink-muted);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.45rem 0.7rem;
  border-bottom: 1px solid var(--axis);
}
.table td { padding: 0.45rem 0.7rem; border-bottom: 1px solid var(--grid); }
.table tr:last-child td { border-bottom: none; }
tr.sched-stop td:first-child { color: var(--series-orange); }
tr.sched-switch td { background: rgba(25, 158, 112, 0.07); }

.gas-chip {
  display: inline-block;
  padding: 0.1rem 0.55rem;
  border-radius: 999px;
  background: rgba(57, 135, 229, 0.16);
  border: 1px solid rgba(57, 135, 229, 0.4);
  font-size: 0.82rem;
  white-space: nowrap;
}

/* ------------------------------- logbook ------------------------------- */

.dive-card {
  display: flex;
  width: 100%;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  text-align: left;
  font: inherit;
  color: var(--ink-primary);
  background: linear-gradient(180deg, rgba(23, 42, 74, 0.45), rgba(12, 22, 38, 0.85));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.85rem 1.1rem;
  margin-bottom: 0.7rem;
  cursor: pointer;
  transition: border-color .15s, transform .12s;
}
.dive-card:hover { border-color: var(--accent-deep); transform: translateY(-1px); }
.dive-card-main { display: flex; flex-direction: column; gap: 0.12rem; min-width: 0; }
.dive-card-date { font-size: 0.8rem; color: var(--ink-muted); }
.dive-card-site { font-weight: 650; }
.dive-card-gases { font-size: 0.82rem; color: var(--ink-secondary); }
.dive-card-stats { display: flex; align-items: center; gap: 0.9rem; flex-shrink: 0; flex-wrap: wrap; justify-content: flex-end; }
.stat { color: var(--ink-secondary); font-size: 0.85rem; }
.stat em { font-style: normal; font-weight: 700; font-size: 1.05rem; color: var(--ink-primary); }

.gf-chip, .src-chip {
  font-size: 0.75rem;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  border: 1px solid;
  white-space: nowrap;
}
.gf-chip.gf-ok { color: #7fe28a; border-color: var(--status-good); }
.gf-chip.gf-warn { color: #ffd98a; border-color: var(--status-warning); }
.gf-chip.gf-high { color: #ffb9b8; border-color: var(--status-critical); }
.src-chip { color: var(--ink-muted); border-color: var(--axis); }
.src-chip.rep { color: var(--accent); border-color: var(--accent-deep); }

.detail-title { margin: 0.6rem 0; }
.detail-date { font-size: 0.85rem; color: var(--ink-muted); font-weight: 400; margin-left: 0.6rem; }
.detail-meta { color: var(--ink-secondary); font-size: 0.92rem; margin: -0.2rem 0 1rem; }
.map-link { color: var(--accent); text-decoration: none; margin-left: 0.5rem; }
.map-link:hover { text-decoration: underline; }

/* planned dives stand out: dashed accent border + explicit chip */
.dive-card.planned {
  border-style: dashed;
  border-color: rgba(45, 212, 234, 0.45);
  background: linear-gradient(180deg, rgba(14, 125, 158, 0.14), rgba(12, 22, 38, 0.85));
}
.plan-chip {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px dashed var(--accent);
  color: var(--accent);
  white-space: nowrap;
  vertical-align: middle;
}
.src-chip.evt { color: var(--ink-secondary); border-color: var(--axis); }

/* dive edit form + events */
.edit-form textarea {
  font: inherit;
  color: var(--ink-primary);
  background: var(--bg-deep);
  border: 1px solid var(--axis);
  border-radius: 8px;
  padding: 0.45rem 0.6rem;
  resize: vertical;
}
.edit-form textarea:focus { outline: 2px solid var(--accent-deep); border-color: transparent; }

.event-row {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.4rem 0.2rem;
  border-bottom: 1px solid var(--grid);
  font-size: 0.92rem;
}
.event-row:last-child { border-bottom: none; }
.event-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: #06121f;
  flex-shrink: 0;
}
.event-time { color: var(--ink-muted); font-variant-numeric: tabular-nums; min-width: 4.5rem; }
.event-text { flex: 1; color: var(--ink-secondary); }
.event-add { margin-top: 0.8rem; }

/* -------------------------------- charts ------------------------------- */

.chart-box { width: 100%; }
.chart { width: 100%; height: auto; display: block; }
.chart .tick { fill: var(--ink-muted); font-size: 11px; font-family: var(--font); font-variant-numeric: tabular-nums; }
.chart .axis-title { fill: var(--ink-muted); font-size: 11px; font-family: var(--font); }
.chart .legend-label { fill: var(--ink-secondary); font-size: 12px; font-family: var(--font); }
.chart .mark-label { fill: var(--ink-secondary); font-size: 11px; font-family: var(--font); }
.chart .event-glyph { fill: #06121f; font-size: 9px; font-family: var(--font); pointer-events: none; }
.chart .ref-label { fill: var(--ink-muted); font-size: 10px; font-family: var(--font); }
.chart-empty { color: var(--ink-muted); }

.chart-tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(6, 13, 24, 0.94);
  border: 1px solid var(--axis);
  border-radius: 8px;
  padding: 0.45rem 0.65rem;
  font-size: 0.82rem;
  color: var(--ink-secondary);
  z-index: 5;
  font-variant-numeric: tabular-nums;
}
.chart-tooltip strong { color: var(--ink-primary); }

/* GF meter */
.gf-meter { margin: 0.6rem 0 1rem; }
.gf-meter-track {
  position: relative;
  height: 12px;
  border-radius: 999px;
  background: var(--grid);
  overflow: hidden;
}
.gf-meter-fill { height: 100%; border-radius: 999px; transition: width .4s ease; }
.gf-meter-fill.gf-ok { background: linear-gradient(90deg, #1baf7a, #7fe28a); }
.gf-meter-fill.gf-warn { background: linear-gradient(90deg, #c98500, var(--status-warning)); }
.gf-meter-fill.gf-high { background: linear-gradient(90deg, var(--status-serious), var(--status-critical)); }
.gf-meter-100 {
  position: absolute;
  top: -2px; bottom: -2px;
  width: 2px;
  background: var(--ink-secondary);
}
.gf-meter-caption {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--ink-muted);
  margin-top: 0.35rem;
}
.gf-value { color: var(--ink-primary); font-weight: 700; }

/* --------------------------- account dialog ---------------------------- */

.account-dialog {
  background: transparent;
  border: none;
  padding: 0;
  max-width: min(92vw, 420px);
  width: 100%;
}
.account-dialog::backdrop {
  background: rgba(3, 8, 16, 0.7);
  backdrop-filter: blur(4px);
}
.account-form {
  background: linear-gradient(180deg, var(--surface-3), var(--surface-1));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  color: var(--ink-primary);
}
.account-form h2 { margin: 0 0 0.3rem; font-size: 1.2rem; }
.account-form label { margin-top: 0.4rem; }
.account-actions { display: flex; gap: 0.6rem; margin-top: 0.8rem; flex-wrap: wrap; }
.account-error { color: #ffb9b8; font-size: 0.88rem; margin: 0.4rem 0 0; }
.account-close { align-self: flex-end; margin-top: 0.4rem; }
.btn-account.signed-in { border-color: var(--status-good); color: #7fe28a; }

/* -------------------------------- toast -------------------------------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.6rem;
  transform: translateX(-50%);
  background: var(--surface-3);
  color: var(--ink-primary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.7rem 1.2rem;
  box-shadow: var(--shadow);
  z-index: 50;
  max-width: min(92vw, 480px);
  font-size: 0.92rem;
}
.toast-ok { border-color: var(--status-good); }
.toast-warn { border-color: var(--status-warning); }
.toast-error { border-color: var(--status-critical); }

/* -------------------------------- footer ------------------------------- */

.footer {
  max-width: 1180px;
  margin: 2rem auto 0;
  padding: 1.2rem clamp(1rem, 3vw, 2rem) 2.4rem;
  color: var(--ink-muted);
  font-size: 0.82rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; gap: 0.6rem; }
  .nav { order: 3; width: 100%; }
  .dive-card { flex-direction: column; align-items: flex-start; }
  .dive-card-stats { justify-content: flex-start; }
}