/* Bitcoin-Backed Loan Tracker — Apple glass / modern polished */

:root {
  --ink: #1d1d1f;
  --ink-soft: #6e6e73;
  --ink-faint: #98989d;
  --paper: #f5f5f7;
  --card: rgba(255, 255, 255, 0.72);
  --card-solid: #ffffff;
  --line: rgba(0, 0, 0, 0.08);
  --line-strong: rgba(0, 0, 0, 0.12);
  --accent: #f7931a;        /* bitcoin orange */
  --accent-deep: #c2571a;
  --accent-soft: rgba(247, 147, 26, 0.12);
  --green: #30a46c;
  --green-soft: rgba(48, 164, 108, 0.12);
  --yellow: #b3850a;
  --yellow-soft: rgba(255, 204, 0, 0.16);
  --red: #e5484d;
  --red-soft: rgba(229, 72, 77, 0.10);
  --darkred: #8e2428;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow-card:
    0 1px 2px rgba(0, 0, 0, 0.04),
    0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow-pop:
    0 1px 2px rgba(0, 0, 0, 0.05),
    0 12px 32px rgba(0, 0, 0, 0.10);
  --blur: saturate(180%) blur(20px);
  --font: "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-ui: "Inter", "Helvetica Neue", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-ui);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(247, 147, 26, 0.10), transparent 60%),
    radial-gradient(1000px 500px at -10% 20%, rgba(90, 120, 255, 0.08), transparent 55%),
    radial-gradient(900px 700px at 50% 110%, rgba(48, 164, 108, 0.07), transparent 60%),
    var(--paper);
  background-attachment: fixed;
  min-height: 100vh;
}

/* ---------- Sticky glass top bar (header + nav) ---------- */

.top-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 245, 247, 0.72);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--line);
}

.site-header {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.1rem 1.25rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.site-title-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-header h1 {
  font-family: var(--font);
  font-weight: 700;
  font-size: 1.35rem;
  margin: 0;
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, var(--ink) 30%, var(--accent-deep));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.tagline {
  color: var(--ink-faint);
  font-size: 0.8rem;
  margin: 0;
}

/* ---------- Nav — iOS-style segmented control ---------- */

.main-nav {
  display: flex;
  gap: 4px;
  background: rgba(0, 0, 0, 0.05);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}
.main-nav::-webkit-scrollbar { display: none; }

.nav-btn {
  flex: 1;
  min-width: max-content;
  padding: 0.45rem 1rem;
  border: none;
  background: transparent;
  color: var(--ink-soft);
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  cursor: pointer;
  border-radius: 999px;
  white-space: nowrap;
  transition: color 0.18s ease, background 0.18s ease, box-shadow 0.18s ease, transform 0.12s ease;
}

.nav-btn:hover { color: var(--ink); }
.nav-btn:active { transform: scale(0.97); }

.nav-btn.active {
  background: var(--card-solid);
  color: var(--ink);
  font-weight: 600;
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.10),
    0 4px 12px rgba(0, 0, 0, 0.06);
}

/* ---------- Layout ---------- */

#app {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2rem;
}

.view { display: none; }
.view.active {
  display: block;
  animation: view-in 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes view-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Glass cards ---------- */

.card {
  background: var(--card);
  -webkit-backdrop-filter: var(--blur);
  backdrop-filter: var(--blur);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem;
  margin-bottom: 1.25rem;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.card:hover { box-shadow: var(--shadow-pop); }

.card h2 {
  font-family: var(--font);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 0.9rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--line);
}

.card h3 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  font-weight: 600;
  margin: 1.2rem 0 0.55rem;
}

/* ---------- Forms ---------- */

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.9rem;
}

.field label {
  display: block;
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--ink-soft);
  margin-bottom: 0.3rem;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  font-size: 0.95rem;
  background: rgba(255, 255, 255, 0.65);
  color: var(--ink);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.field input:hover,
.field select:hover,
.field textarea:hover {
  border-color: rgba(0, 0, 0, 0.2);
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
  background: #fff;
}

.field .hint {
  font-size: 0.72rem;
  color: var(--ink-faint);
  margin-top: 0.25rem;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  padding: 0.62rem 1.35rem;
  border: none;
  border-radius: 999px;
  background: linear-gradient(180deg, #2c2c2e, #1a1a1c);
  color: #fff;
  font-family: var(--font-ui);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15), 0 6px 16px rgba(0, 0, 0, 0.12);
  transition: transform 0.12s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.btn:hover { filter: brightness(1.12); box-shadow: 0 2px 4px rgba(0,0,0,0.15), 0 10px 24px rgba(0,0,0,0.16); }
.btn:active { transform: scale(0.97); }

.btn.secondary {
  background: rgba(0, 0, 0, 0.05);
  color: var(--ink);
  border: 1px solid var(--line-strong);
  box-shadow: none;
}

.btn.secondary:hover { background: rgba(0, 0, 0, 0.08); filter: none; }

.btn.danger {
  background: linear-gradient(180deg, #f06065, var(--red));
}

.btn.small {
  padding: 0.35rem 0.85rem;
  font-size: 0.78rem;
}

.btn-row {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

/* ---------- Stat blocks ---------- */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.9rem;
}

.stat {
  background: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0.8rem 0.9rem;
}

.stat .stat-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  font-weight: 600;
  color: var(--ink-faint);
}

.stat .stat-value {
  font-family: var(--font);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 0.2rem;
}

.stat .stat-sub {
  font-size: 0.75rem;
  color: var(--ink-soft);
}

/* ---------- Tables ---------- */

.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

th, td {
  text-align: right;
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

th:first-child, td:first-child { text-align: left; }

th {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--ink-faint);
  font-weight: 600;
}

tbody tr { transition: background 0.15s ease; }
tbody tr:hover { background: rgba(0, 0, 0, 0.025); }

tr.row-made { background: var(--green-soft); }
tr.row-missed { background: var(--red-soft); }
tr.row-next { box-shadow: inset 0 0 0 2px var(--accent); }
tr.row-balloon { font-weight: 600; background: var(--accent-soft); }

.num { font-family: var(--mono); font-size: 0.82rem; }

/* ---------- Health indicator ---------- */

.health {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.32rem 0.85rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.health::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 8px currentColor;
}

.health.green { background: var(--green-soft); color: var(--green); }
.health.yellow { background: var(--yellow-soft); color: var(--yellow); }
.health.red { background: var(--red-soft); color: var(--red); }
.health.darkred { background: var(--darkred); color: #fff; }

.ratio-bar {
  height: 8px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.07);
  overflow: hidden;
  margin: 0.5rem 0;
}

.ratio-bar .fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.ratio-bar .fill.green { background: linear-gradient(90deg, #4cc38a, var(--green)); }
.ratio-bar .fill.yellow { background: linear-gradient(90deg, #ffd60a, var(--yellow)); }
.ratio-bar .fill.red, .ratio-bar .fill.darkred { background: linear-gradient(90deg, #ff6961, var(--red)); }

/* ---------- Badges & misc ---------- */

.badge {
  display: inline-block;
  padding: 0.18rem 0.6rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.badge.active { background: var(--green-soft); color: var(--green); }
.badge.paidoff { background: var(--accent-soft); color: var(--accent-deep); }
.badge.default { background: var(--red-soft); color: var(--red); }
.badge.late { background: var(--yellow-soft); color: var(--yellow); }
.badge.missed { background: var(--red-soft); color: var(--red); }

.muted { color: var(--ink-faint); }
.small-text { font-size: 0.8rem; }

.notice {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 1rem;
  border: 1px solid transparent;
}

.notice.warn { background: var(--yellow-soft); color: var(--yellow); border-color: rgba(179, 133, 10, 0.2); }
.notice.danger { background: var(--red-soft); color: var(--red); border-color: rgba(229, 72, 77, 0.2); }
.notice.info { background: var(--accent-soft); color: var(--accent-deep); border-color: rgba(247, 147, 26, 0.25); }

/* ---------- Slider ---------- */

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.slider-value {
  font-family: var(--font);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
  margin: 0.4rem 0;
}

/* ---------- Footer ---------- */

.site-footer {
  max-width: 960px;
  margin: 2rem auto 0;
  padding: 1rem 1.25rem 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 0.78rem;
}

/* ---------- Responsive ---------- */

@media (max-width: 640px) {
  .site-header { padding: 0.9rem 1rem 0.75rem; }
  .site-header h1 { font-size: 1.15rem; }
  .tagline { display: none; }
  #app { padding: 1rem 0.9rem 1.5rem; }
  .card { padding: 1.1rem; border-radius: 16px; }
  .stat .stat-value { font-size: 1.2rem; }
  th, td { padding: 0.45rem 0.5rem; font-size: 0.8rem; }
  .nav-btn { padding: 0.4rem 0.8rem; font-size: 0.78rem; }
}