/* Tokyo Night theme */
:root {
  --bg:        #1a1b2e;
  --bg-panel:  #24283b;
  --bg-input:  #1f2335;
  --border:    #292e42;
  --fg:        #c0caf5;
  --fg-muted:  #565f89;
  --blue:      #7aa2f7;
  --cyan:      #7dcfff;
  --green:     #9ece6a;
  --purple:    #bb9af7;
  --red:       #f7768e;
  --orange:    #ff9e64;
  --yellow:    #e0af68;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  padding: 1rem 0.75rem;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.hidden { display: none !important; }

/* ── Input card ── */
.input-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.input-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.input-header label {
  font-size: 0.85rem;
  color: var(--fg-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.streak-badge {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  background: rgba(255, 158, 100, 0.15);
  color: var(--orange);
  white-space: nowrap;
}

.streak-badge.logged {
  background: rgba(158, 206, 106, 0.15);
  color: var(--green);
}

.input-row {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

#weightInput {
  background: var(--bg-input);
  border: 2px solid var(--border);
  border-radius: 0.75rem;
  color: var(--cyan);
  font-size: clamp(3rem, 15vw, 4.5rem);
  font-weight: 700;
  width: clamp(160px, 55vw, 220px);
  text-align: center;
  padding: 0.2rem 0.4rem;
  outline: none;
  transition: border-color 0.2s;
  -moz-appearance: textfield;
}
#weightInput::-webkit-inner-spin-button,
#weightInput::-webkit-outer-spin-button { -webkit-appearance: none; }
#weightInput:focus { border-color: var(--blue); }

.unit {
  font-size: clamp(1.4rem, 6vw, 2.2rem);
  color: var(--fg-muted);
  font-weight: 600;
}

/* ── Live BMI ── */
.live-bmi {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 1.8rem;
}

.bmi-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--fg);
}

.bmi-label {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.bmi-under { background: rgba(125, 207, 255, 0.15); color: var(--cyan); }
.bmi-normal { background: rgba(158, 206, 106, 0.15); color: var(--green); }
.bmi-over   { background: rgba(255, 158, 100, 0.15); color: var(--orange); }
.bmi-obese  { background: rgba(247, 118, 142, 0.15); color: var(--red); }

/* ── Goal progress ── */
.goal-progress {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.goal-info {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.8rem;
  color: var(--fg-muted);
}

.goal-info strong { color: var(--orange); }

.goal-remaining {
  font-weight: 600;
  color: var(--fg);
}

.goal-reached {
  font-weight: 700;
  color: var(--green);
}

.progress-track {
  width: 100%;
  height: 6px;
  background: var(--bg-input);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 999px;
  background: var(--orange);
  transition: width 0.4s ease;
}

.progress-fill.complete { background: var(--green); }

/* ── Log button ── */
#logBtn {
  background: var(--blue);
  color: var(--bg);
  border: none;
  border-radius: 0.75rem;
  font-size: 1.1rem;
  font-weight: 700;
  width: 100%;
  padding: 0.85rem 1rem;
  cursor: pointer;
  letter-spacing: 0.05em;
  transition: background 0.15s, transform 0.1s;
  touch-action: manipulation;
}
#logBtn:hover  { background: var(--cyan); }
#logBtn:active { transform: scale(0.97); }

.feedback {
  font-size: 0.95rem;
  min-height: 1.4em;
  font-weight: 600;
  text-align: center;
}
.feedback.ok    { color: var(--green); }
.feedback.error { color: var(--red); }

/* ── Settings card ── */
.settings-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 1rem;
  overflow: hidden;
}

.settings-card summary {
  font-size: 0.8rem;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  padding: 0.85rem 1rem;
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.settings-card summary::-webkit-details-marker { display: none; }
.settings-card summary::before {
  content: '▶';
  font-size: 0.6rem;
  transition: transform 0.2s;
  color: var(--fg-muted);
}
.settings-card[open] summary::before { transform: rotate(90deg); }
.settings-card summary:hover { color: var(--fg); }

.settings-body {
  padding: 0 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  border-top: 1px solid var(--border);
}

.setting-row {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.setting-row > label {
  font-size: 0.75rem;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding-top: 0.5rem;
}

.setting-input-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.setting-input-group input {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  color: var(--fg);
  font-size: 1.1rem;
  font-weight: 600;
  width: 90px;
  padding: 0.4rem 0.6rem;
  outline: none;
  transition: border-color 0.2s;
  -moz-appearance: textfield;
}
.setting-input-group input::-webkit-inner-spin-button,
.setting-input-group input::-webkit-outer-spin-button { -webkit-appearance: none; }
.setting-input-group input:focus { border-color: var(--blue); }

.unit-small {
  font-size: 0.9rem;
  color: var(--fg-muted);
  font-weight: 600;
}

.save-btn {
  background: var(--blue);
  color: var(--bg);
  border: none;
  border-radius: 0.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: background 0.15s;
  touch-action: manipulation;
}
.save-btn:hover { background: var(--cyan); }

.clear-btn {
  background: none;
  color: var(--fg-muted);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  touch-action: manipulation;
}
.clear-btn:hover { color: var(--red); border-color: var(--red); }

/* ── Chart card ── */
.chart-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem;
}

.chart-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.chart-title {
  font-size: 0.8rem;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.chart-legend {
  display: flex;
  gap: 0.75rem;
  flex: 1;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.75rem;
  color: var(--fg-muted);
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.trend-badge {
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  white-space: nowrap;
}
.trend-badge.down { background: rgba(158, 206, 106, 0.15); color: var(--green); }
.trend-badge.up   { background: rgba(247, 118, 142, 0.15); color: var(--red); }
.trend-badge.flat { background: rgba(122, 162, 247, 0.15); color: var(--blue); }

/* ── History card ── */
.history-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem;
}

.history-card h2 {
  font-size: 0.8rem;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 0.75rem;
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 280px;
}

thead th {
  font-size: 0.75rem;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.35rem 0.6rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.12s;
}
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: rgba(122, 162, 247, 0.06); }

tbody td {
  padding: 0.6rem 0.6rem;
  font-size: 0.95rem;
  vertical-align: middle;
}

tbody td:nth-child(2) {
  font-size: clamp(1.1rem, 4vw, 1.4rem);
  font-weight: 700;
  color: var(--cyan);
  white-space: nowrap;
}

.bmi-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  margin-left: 0.4rem;
  letter-spacing: 0.03em;
  vertical-align: middle;
}

.delta-up   { color: var(--red);      font-size: 0.8rem; margin-left: 0.3rem; }
.delta-down { color: var(--green);    font-size: 0.8rem; margin-left: 0.3rem; }
.delta-same { color: var(--fg-muted); font-size: 0.8rem; margin-left: 0.3rem; }

.delete-btn {
  background: none;
  border: none;
  color: var(--fg-muted);
  cursor: pointer;
  font-size: 1rem;
  padding: 0.5rem 0.6rem;
  border-radius: 0.4rem;
  transition: color 0.15s, background 0.15s;
  touch-action: manipulation;
}
.delete-btn:hover { color: var(--red); background: rgba(247, 118, 142, 0.1); }

.empty {
  color: var(--fg-muted);
  text-align: center;
  padding: 1.5rem;
  font-style: italic;
}

/* ── PIN screen ── */
.pin-screen {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.pin-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.pin-card h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: 0.02em;
}

.pin-prompt {
  font-size: 0.8rem;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.pin-boxes {
  display: flex;
  gap: 0.75rem;
}

.pin-box {
  width: 56px;
  height: 64px;
  background: var(--bg-input);
  border: 2px solid var(--border);
  border-radius: 0.75rem;
  color: var(--cyan);
  font-size: 1.75rem;
  font-weight: 700;
  text-align: center;
  outline: none;
  transition: border-color 0.2s;
  -moz-appearance: textfield;
  caret-color: transparent;
}
.pin-box::-webkit-outer-spin-button,
.pin-box::-webkit-inner-spin-button { -webkit-appearance: none; }
.pin-box:focus { border-color: var(--blue); }

.pin-message {
  font-size: 0.85rem;
  color: var(--red);
  min-height: 1.2em;
  text-align: center;
}

.pin-create-confirm {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
  width: 100%;
}

.pin-create-confirm p {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

.pin-confirm-btns {
  display: flex;
  gap: 0.75rem;
  width: 100%;
}

.pin-confirm-btns button {
  flex: 1;
  background: var(--blue);
  color: var(--bg);
  border: none;
  border-radius: 0.6rem;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 0.65rem 0.5rem;
  cursor: pointer;
  transition: background 0.15s;
  touch-action: manipulation;
}
.pin-confirm-btns button:hover { background: var(--cyan); }
.pin-confirm-btns button.secondary {
  background: none;
  color: var(--fg-muted);
  border: 1px solid var(--border);
}
.pin-confirm-btns button.secondary:hover { color: var(--fg); border-color: var(--fg-muted); }

/* ── Desktop enhancements ── */
@media (min-width: 480px) {
  body { padding: 1.5rem 1.25rem; }
  .container { gap: 1.25rem; }

  .input-card { padding: 1.75rem 2rem; gap: 1.25rem; }
  .input-header label { font-size: 1rem; }

  #logBtn { width: auto; padding: 0.75rem 3rem; font-size: 1.25rem; }

  .chart-card   { padding: 1.25rem 1.5rem; }
  .history-card { padding: 1.25rem 1.5rem; }
  .settings-card summary { padding: 1rem 1.5rem; }
  .settings-body { padding: 0 1.5rem 1.25rem; }

  thead th  { font-size: 0.8rem;  padding: 0.4rem 0.75rem; }
  tbody td  { font-size: 1.05rem; padding: 0.7rem 0.75rem; }
}

@media (min-width: 640px) {
  body { padding: 2rem 1.5rem; }
  .container { gap: 1.5rem; }
  .chart-card   { padding: 1.5rem 1.75rem; }
  .history-card { padding: 1.5rem 1.75rem; }

  .setting-row {
    flex-direction: row;
    align-items: center;
    gap: 1rem;
  }
  .setting-row > label {
    width: 110px;
    flex-shrink: 0;
    padding-top: 0;
  }
}