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

/* ── Design tokens ── */
:root {
  --bg:             #0d1b2a;
  --surface:        #112233;
  --surface2:       #1a3050;
  --input-bg:       #1e2d3d;
  --input-bg-focus: #243649;
  --border:         #2a4a6a;
  --border-focus:   #4a9fd4;
  --blue:           #1e6fa8;
  --blue-light:     #4a9fd4;
  --blue-bright:    #6bbde3;
  --accent:         #00c2f0;
  --text:           #e8f4fd;
  --text-muted:     #7aa8c8;
  --text-dim:       #4a7a9b;
  --good:           #3dd68c;
  --warn:           #f0a500;
  --bad:            #f05050;
  --radius:         8px;
  --radius-sm:      5px;
}

/* ── Base ── */
html, body {
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  font-size: 15px;
  line-height: 1.5;
}
body {
  padding: 16px;
  max-width: 680px;
  margin: 0 auto;
}
/* Full-width pages (e.g. cable comparison table) */
body.wide {
  max-width: 100%;
}

/* ── Hamburger button ── */
.hamburger {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 9px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex-shrink: 0;
  align-self: center;
}
.hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--blue-bright);
  border-radius: 2px;
  transition: transform 0.22s, opacity 0.22s;
}
.hamburger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ── Nav drawer ── */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(0, 0, 0, 0.55);
}
.nav-overlay.open { display: block; }

.nav-drawer {
  position: fixed;
  top: 0; left: -260px; bottom: 0;
  width: 240px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  z-index: 400;
  transition: left 0.25s ease;
  padding-bottom: 64px;
}
.nav-drawer.open { left: 0; }

.nav-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid var(--border);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--blue-light);
}
.nav-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.1rem;
  cursor: pointer;
  line-height: 1;
}
.nav-link {
  display: block;
  padding: 14px 16px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
  transition: background 0.15s, color 0.15s;
}
.nav-link:hover  { background: var(--surface2); color: var(--text); }
.nav-link.active { color: var(--accent); background: rgba(0,194,240,0.06); border-left: 3px solid var(--accent); }
.nav-link-sub {
  font-size: 0.72rem;
  color: var(--text-dim);
  display: block;
  margin-top: 2px;
}
.nav-footer {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.66rem;
  color: var(--text-dim);
  line-height: 1.7;
}

/* ── Header ── */
header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 0 14px;
}
.header-text { flex: 1; text-align: center; }
.header-spacer { width: 38px; flex-shrink: 0; }

/* ── Print/export button (sits left of reset button in header) ── */
.print-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 1rem;
  line-height: 1;
  padding: 7px 9px;
  cursor: pointer;
  flex-shrink: 0;
  align-self: center;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.print-btn:hover {
  background: rgba(0, 194, 240, 0.12);
  border-color: rgba(0, 194, 240, 0.4);
  color: var(--accent);
}
.print-btn:disabled {
  opacity: 0.5;
  cursor: wait;
}

/* ── Reset button (top-right of header, mirrors hamburger width) ── */
.reset-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 1rem;
  line-height: 1;
  padding: 7px 9px;
  cursor: pointer;
  flex-shrink: 0;
  align-self: center;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.reset-btn:hover {
  background: rgba(240, 80, 80, 0.15);
  border-color: rgba(240, 80, 80, 0.4);
  color: var(--bad);
}
header h1 {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.3px;
}
header p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 3px;
}

/* ── Card ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 14px;
}
.card-title {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--blue-light);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* ── Frequency preset buttons ── */
.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 4px;
}
.preset-btn {
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-muted);
  font-size: 0.78rem;
  padding: 5px 12px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  white-space: nowrap;
}
.preset-btn:hover, .preset-btn.active {
  background: var(--blue);
  border-color: var(--blue-light);
  color: var(--text);
}

/* ── Field grid ── */
.fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.field-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.field-group.full { grid-column: 1 / -1; }

label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ── Input wrap ── */
.input-wrap {
  display: flex;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color 0.15s;
}
.input-wrap:focus-within {
  border-color: var(--border-focus);
  background: var(--input-bg-focus);
}
.input-wrap input[type="number"],
.input-wrap input[type="text"] {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 0.95rem;
  padding: 9px 10px;
  -moz-appearance: textfield;
}
.input-wrap input::-webkit-outer-spin-button,
.input-wrap input::-webkit-inner-spin-button { -webkit-appearance: none; }

/* ── Unit select (inline badge) ── */
.unit-select {
  background: var(--surface2);
  border: none;
  border-left: 1px solid var(--border);
  color: var(--blue-bright);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0 8px;
  cursor: pointer;
  outline: none;
  min-width: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
}
select.unit-select { cursor: pointer; }
.unit-select:focus { color: var(--accent); }

/* ── Cable type select (full-width dropdown) ── */
.cable-select-wrap {
  display: flex;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color 0.15s;
  position: relative;
}
.cable-select-wrap:focus-within {
  border-color: var(--border-focus);
  background: var(--input-bg-focus);
}
.cable-select-wrap::after {
  content: '▾';
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--blue-bright);
  pointer-events: none;
  font-size: 0.85rem;
}
select.cable-select {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 0.95rem;
  padding: 10px 32px 10px 10px;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
}
select.cable-select option { background: var(--surface2); color: var(--text); }

/* ── Cable preset badge (shown when cable type is locked) ── */
.cable-badge {
  font-size: 0.72rem;
  background: rgba(0,194,240,0.12);
  border: 1px solid rgba(0,194,240,0.25);
  color: var(--accent);
  border-radius: 12px;
  padding: 2px 9px;
  margin-top: 6px;
  display: inline-block;
}

/* ── Locked input (rate driven by cable preset) ── */
.input-wrap.rate-locked {
  border-color: rgba(0,194,240,0.3);
  background: rgba(0,194,240,0.05);
}
.input-wrap.rate-locked input { color: var(--accent); }

/* ── Output table (shared base) ── */
.output-table {
  width: 100%;
  border-collapse: collapse;
}
.output-table thead tr { background: var(--surface2); }
.output-table thead th {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--blue-light);
  padding: 8px 12px;
  text-align: left;
}
.output-table thead th.right { text-align: right; }
.output-table tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
.output-table tbody tr:hover { background: rgba(74,159,212,0.06); }
.output-table tbody tr:last-child { border-bottom: none; }

/* ── Note ── */
.note {
  font-size: 0.75rem;
  color: var(--text-dim);
  padding: 10px 12px;
  background: rgba(0,194,240,0.04);
  border-left: 3px solid var(--border);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 10px;
  line-height: 1.6;
}
.note strong { color: var(--text-muted); }

/* ── Footer ── */
footer {
  text-align: center;
  font-size: 0.72rem;
  color: var(--text-dim);
  padding: 14px 0 8px;
}

/* ── Landscape tweaks ── */
@media (orientation: landscape) and (max-width: 900px) {
  body    { padding: 10px 16px; }
  header  { padding: 10px 0 10px; }
  header h1 { font-size: 1.2rem; }
  .card   { padding: 14px; margin-bottom: 10px; }
}

/* ── Portrait: single-column field grid ── */
@media (orientation: portrait), (max-width: 500px) {
  .fields { grid-template-columns: 1fr; }
  .field-group.full { grid-column: auto; }
}

/* ── Auth — nav login / profile ─────────────────────────────────────────────── */
.nav-auth {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4px;
}
.nav-login-btn {
  width: 100%;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 9px 14px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
}
.nav-login-btn:hover { background: var(--blue-light); }

.nav-register-btn {
  width: 100%;
  background: transparent;
  color: var(--blue-light);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  margin-top: 6px;
}
.nav-register-btn:hover { background: var(--surface2); border-color: var(--blue-light); }

.das-link-btn {
  background: none;
  border: none;
  color: var(--blue-light);
  font-size: inherit;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
}
.das-link-btn:hover { color: var(--blue-bright); }

.nav-profile-info { width: 100%; }
.nav-profile-name {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-profile-links {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}
.nav-profile-link {
  font-size: 0.85rem;
  color: var(--blue-light);
  text-decoration: none;
}
.nav-profile-link:hover { color: var(--blue-bright); text-decoration: underline; }
.nav-logout-btn {
  background: transparent;
  border: 1px solid var(--bad);
  color: var(--bad);
  border-radius: var(--radius-sm);
  padding: 3px 10px;
  font-size: 0.8rem;
  cursor: pointer;
}
.nav-logout-btn:hover { background: rgba(240,80,80,.12); }

/* ── Auth — locked nav links ──────────────────────────────────────────────────── */
.nav-link.locked {
  opacity: 0.42;
  cursor: not-allowed;
  pointer-events: auto;
}
.nav-tier-badge {
  display: inline-block;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 1px 6px;
  border-radius: 10px;
  background: var(--surface2);
  color: var(--text-muted);
  border: 1px solid var(--border);
  margin-left: 6px;
  vertical-align: middle;
}
.nav-tier-badge.pro {
  background: #1a2a50;
  color: #7ab8f5;
  border-color: #3a6aaa;
}

/* ── Auth — login modal ─────────────────────────────────────────────────────── */
.das-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  z-index: 9000;
  align-items: center;
  justify-content: center;
}
.das-modal.open { display: flex; }
.das-modal-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 360px;
  margin: 16px;
  box-shadow: 0 8px 32px rgba(0,0,0,.5);
}
.das-modal-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  font-size: 1rem;
  font-weight: 600;
  color: var(--blue-bright);
}
.das-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1rem;
  cursor: pointer;
  padding: 2px 6px;
}
.das-modal-close:hover { color: var(--text); }
.das-modal-body {
  padding: 20px 18px;
}
.das-modal-body label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: .05em;
}
.das-modal-body .input-wrap input {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.95rem;
}
.das-modal-body .input-wrap input:focus {
  border-color: var(--border-focus);
  outline: none;
  background: var(--input-bg-focus);
}
.das-login-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}
.das-btn-primary {
  width: 100%;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}
.das-btn-primary:hover  { background: var(--blue-light); }
.das-btn-primary:disabled { opacity: 0.6; cursor: default; }
.das-form-error {
  margin-top: 10px;
  font-size: 0.84rem;
  color: var(--bad);
  min-height: 18px;
}

/* ── Toast notification ─────────────────────────────────────────────────────── */
.das-toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 0.88rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s, transform .25s;
  z-index: 9100;
  white-space: nowrap;
}
.das-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Light mode variable overrides ──────────────────────────────────────────── */
html[data-theme="light"] {
  --bg:             #f0f4f8;
  --surface:        #ffffff;
  --surface2:       #e4ecf4;
  --input-bg:       #f8fafc;
  --input-bg-focus: #eef4fa;
  --border:         #b8ccd8;
  --border-focus:   #1e6fa8;
  --blue:           #1a5f94;
  --blue-light:     #1e6fa8;
  --blue-bright:    #155080;
  --accent:         #0070a8;
  --text:           #0d1b2a;
  --text-muted:     #2a4a6a;
  --text-dim:       #4a6a8a;
  --good:           #1a7a45;
  --warn:           #8a5800;
  --bad:            #b02020;
}

/* Light mode specific fixes */
html[data-theme="light"] .nav-overlay        { background: rgba(0,0,0,0.35); }
html[data-theme="light"] .das-modal          { background: rgba(0,0,0,0.35); }
html[data-theme="light"] .das-modal-card     { box-shadow: 0 8px 32px rgba(0,0,0,0.15); }
html[data-theme="light"] .nav-tier-badge.pro { background: #ddeeff; color: #1a5f94; border-color: #88aacc; }
html[data-theme="light"] .note              { background: rgba(0,112,168,0.05); }
html[data-theme="light"] .output-table tbody tr:hover { background: rgba(30,111,168,0.06); }
html[data-theme="light"] .nav-link.active   { background: rgba(0,112,168,0.08); }
html[data-theme="light"] .cable-badge       { background: rgba(0,112,168,0.1); border-color: rgba(0,112,168,0.25); }
html[data-theme="light"] .input-wrap.rate-locked { background: rgba(0,112,168,0.06); border-color: rgba(0,112,168,0.3); }
html[data-theme="light"] .reset-btn:hover   { background: rgba(176,32,32,0.1); border-color: rgba(176,32,32,0.35); }
html[data-theme="light"] .nav-logout-btn:hover { background: rgba(176,32,32,0.08); }
html[data-theme="light"] select.cable-select option { background: #f8fafc; color: #0d1b2a; }
html[data-theme="light"] select.unit-select  { background: var(--surface2); }

/* ── Theme toggle slider (in nav drawer) ─────────────────────────────────────── */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
}
.theme-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
  transition: color 0.2s;
}
.theme-label.theme-active { color: var(--blue-light); }
.theme-pill {
  width: 42px;
  height: 24px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 12px;
  position: relative;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
  flex-shrink: 0;
}
.theme-pill:hover { border-color: var(--blue-light); }
.theme-knob {
  position: absolute;
  top: 4px;
  left: 4px;
  width: 14px;
  height: 14px;
  background: var(--blue-light);
  border-radius: 50%;
  transition: transform 0.22s ease;
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}
html[data-theme="light"] .theme-knob { transform: translateX(18px); }