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

:root {
  --bg: #ffffff;
  --surface: #f2f2f7;
  --border: #e5e5ea;
  --text: #1c1c1e;
  --secondary: #8e8e93;
  --accent: #007aff;
  --green: #34c759;
  --orange: #ff9500;
  --red: #ff3b30;
  --radius: 14px;
  --max-w: 640px;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

body { background: var(--bg); color: var(--text); -webkit-font-smoothing: antialiased; }

.app { max-width: var(--max-w); margin: 0 auto; padding: 16px 20px 40px; }

/* Tab Bar */
.tab-bar { display: flex; gap: 0; background: var(--surface); border-radius: 12px; padding: 3px; margin-bottom: 24px; }
.tab-bar button {
  flex: 1; border: none; background: transparent; padding: 10px; border-radius: 10px;
  font-size: 14px; font-weight: 600; color: var(--secondary); cursor: pointer; transition: .15s;
}
.tab-bar button.active { background: var(--bg); color: var(--text); box-shadow: 0 1px 3px rgba(0,0,0,.08); }
.tab-bar button:not(.active):hover { opacity: .7; }

/* Header */
.header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 24px; }
.header h1 { font-size: 34px; font-weight: 700; letter-spacing: -.5px; }
.header p { font-size: 15px; color: var(--secondary); margin-top: 2px; }
.header .icon { font-size: 26px; margin-top: 4px; }

/* Section label */
.section-label { font-size: 13px; font-weight: 600; letter-spacing: .5px; color: var(--secondary); margin-bottom: 8px; }

/* Card */
.card { background: var(--surface); border-radius: var(--radius); padding: 16px; margin-bottom: 20px; }
.card-header { font-size: 13px; font-weight: 600; letter-spacing: .5px; color: var(--secondary); margin-bottom: 12px; text-transform: uppercase; }

/* Segmented Control */
.segmented { display: flex; background: var(--surface); border-radius: 10px; padding: 2px; border: .5px solid var(--border); margin-bottom: 20px; }
.segmented button {
  flex: 1; border: none; background: transparent; padding: 8px; border-radius: 8px;
  font-size: 14px; font-weight: 600; color: var(--secondary); cursor: pointer; transition: .15s;
}
.segmented button.active { background: var(--accent); color: #fff; }

/* Input row */
.input-row { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.input-row:last-child { margin-bottom: 0; }
.input-row .sym { font-size: 14px; color: var(--secondary); width: 18px; text-align: center; }
.input-row label { flex: 1; font-size: 15px; }
.input-row input {
  width: 100px; text-align: right; border: none; background: var(--bg); border-radius: 8px;
  padding: 8px 12px; font-size: 15px; font-family: inherit; color: var(--text); outline: none;
}
.input-row input:focus { box-shadow: 0 0 0 2px var(--accent); }
.input-row .unit { font-size: 13px; color: var(--secondary); width: 55px; }

/* Vessel Selector */
.vessel-selector {
  display: flex; align-items: center; gap: 12px; background: var(--surface); border-radius: var(--radius);
  padding: 16px; cursor: pointer; margin-bottom: 20px; transition: opacity .15s;
}
.vessel-selector:hover { opacity: .8; }
.vessel-selector .placeholder { flex: 1; font-size: 15px; color: var(--secondary); }
.vessel-selector .arrow { color: var(--secondary); font-size: 12px; }
.vsl-icon { font-size: 20px; color: var(--secondary); }
.vsl-detail { font-size: 14px; }

/* Button */
.btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; border: none; background: var(--accent); color: #fff;
  padding: 16px; border-radius: var(--radius); font-size: 17px; font-weight: 600;
  cursor: pointer; transition: opacity .15s; margin-bottom: 12px;
}
.btn:hover { opacity: .85; }
.btn:disabled { opacity: .5; cursor: default; }
.btn.green { background: var(--green); }
.btn.outline { background: transparent; color: var(--red); border: 1px solid var(--red); }

/* Error */
.error { color: var(--red); text-align: center; font-size: 14px; font-weight: 500; margin-bottom: 12px; }

/* Results */
#results { display: none; }
.hero { text-align: center; padding: 8px 0 16px; }
.hero .big-icon { font-size: 32px; }
.hero h2 { font-size: 22px; font-weight: 700; margin-top: 4px; }
.hero .sub { font-size: 14px; color: var(--secondary); }
.hero .badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 20px; color: #fff; font-size: 13px; font-weight: 600; margin-top: 8px;
}

.metrics { display: flex; gap: 10px; margin-bottom: 8px; }
.metric { flex: 1; background: var(--surface); border-radius: 12px; padding: 12px; }
.metric .ml { font-size: 11px; color: var(--secondary); text-transform: uppercase; letter-spacing: .3px; font-weight: 500; }
.metric .mv { font-size: 18px; font-weight: 700; letter-spacing: -.3px; margin-top: 2px; }
.metric .mv.accent { color: var(--accent); }

.detail-card { background: var(--bg); border-radius: 12px; padding: 12px; margin-top: 12px; }
.detail-row { display: flex; justify-content: space-between; padding: 8px 0; }
.detail-label { font-size: 14px; color: var(--secondary); }
.detail-value { font-size: 14px; font-weight: 600; }
.detail-divider { height: .5px; background: var(--border); }

.growth-header { margin-top: 12px; }

/* Settings */
.setting-row {
  display: flex; align-items: center; gap: 10px; padding: 14px 0;
}
.setting-row + .setting-row { border-top: .5px solid var(--border); }
.setting-label { font-size: 15px; font-weight: 500; flex: 1; }
.setting-note { font-size: 11px; color: var(--secondary); margin-top: 2px; }
.setting-value { font-size: 16px; font-weight: 600; }
.setting-unit { font-size: 14px; color: var(--secondary); font-weight: 500; }
.edit-group { display: flex; align-items: center; gap: 6px; }
.edit-group input {
  border: .5px solid var(--border); border-radius: 8px; padding: 6px;
  font-size: 15px; width: 64px; text-align: center; font-family: inherit; color: var(--text); background: var(--bg); outline: none;
}
.edit-group input:focus { border-color: var(--accent); }
.edit-group .action { cursor: pointer; font-size: 20px; padding: 2px; }
.clickable { cursor: pointer; display: flex; align-items: center; gap: 4px; }
.clickable:hover { opacity: .7; }
.chevron { color: var(--secondary); font-size: 12px; }

.flex-1 { flex: 1; }

/* Vessel list in settings */
.vessel-settings-row {
  display: flex; align-items: center; gap: 12px; padding: 14px 0;
}
.vessel-settings-row + .vessel-settings-row { border-top: .5px solid var(--border); }
.vessel-settings-row .vs-icon { font-size: 16px; color: var(--secondary); }
.vessel-settings-row .vs-name { font-size: 15px; font-weight: 500; }
.vessel-settings-row .vs-detail { font-size: 12px; color: var(--secondary); margin-top: 1px; }
.vessel-settings-row .vs-count { font-size: 12px; color: var(--secondary); font-weight: 500; }

/* Modal */
.modal-overlay {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,.4);
  justify-content: flex-end; z-index: 100;
}
.modal-overlay.open { display: flex; }
.modal-sheet {
  background: var(--bg); border-radius: 20px 20px 0 0; padding-bottom: 34px;
  max-height: 85%; display: flex; flex-direction: column;
}
.modal-handle { width: 36px; height: 5px; border-radius: 3px; background: #d1d1d6; margin: 8px auto 0; }
.modal-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; }
.modal-header h2 { font-size: 20px; font-weight: 700; }
.modal-header .cancel { font-size: 16px; color: var(--secondary); cursor: pointer; border: none; background: none; }
.modal-header .cancel:hover { opacity: .7; }
.modal-list { overflow-y: auto; padding: 0 20px; flex: 1; }
.modal-item {
  display: flex; align-items: center; gap: 12px; padding: 14px 0; cursor: pointer;
}
.modal-item + .modal-item { border-top: .5px solid var(--border); }
.modal-item .mi-icon { font-size: 18px; color: var(--secondary); }
.modal-item .mi-icon.sel { color: var(--accent); }
.modal-item .mi-name { font-size: 15px; font-weight: 600; flex: 1; }
.modal-item .mi-name.sel { color: var(--accent); }
.modal-item .mi-detail { font-size: 12px; color: var(--secondary); margin-top: 1px; }
.modal-item .mi-check { font-size: 20px; color: var(--accent); }

.modal-confirm-wrap { padding: 12px 20px 0; }

/* Tabs content */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Responsive */
@media (max-width: 480px) {
  .app { padding: 12px 16px 30px; }
  .header h1 { font-size: 28px; }
  .metrics { flex-direction: column; }
  .edit-group { flex-wrap: wrap; }
}