/* ══ NIGHT MODE (default) ══════════════════════════════════════ */
:root {
  --bg:      #0a0e17;
  --bg2:     #0f1520;
  --bg3:     #141c2e;
  --panel:   #111827;
  --panel2:  #1a2540;
  --border:  #1e3a5f;
  --border2: #2a4a72;
  --accent:  #00c8ff;
  --accent2: #0080ff;
  --accent3: #00ffb3;
  --warn:    #ff6b35;
  --text:    #c8d8e8;
  --text2:   #7a9abb;
  --text3:   #4a6a8a;
  --white:   #e8f4ff;
  --green:   #00ffb3;
  --mono:    'Share Tech Mono', monospace;
  --head:    'Rajdhani', sans-serif;
  --body:    'Exo 2', sans-serif;
  --glow:    0 0 20px rgba(0,200,255,0.15);
  --glow2:   0 0 30px rgba(0,200,255,0.25);
  --grid-line: rgba(0,200,255,0.03);
  --header-bg: linear-gradient(180deg, #0d1930 0%, var(--bg2) 100%);
  --tab-active-bg: var(--panel2);
  --input-bg: var(--bg3);
  --result-bg: var(--panel2);
  --side-header-bg: var(--panel2);
  --btn-calc-bg: linear-gradient(135deg, #0040a0, #0080ff);
  --btn-calc-shadow: 0 4px 20px rgba(0,128,255,0.3);
  --btn-calc-shadow-hover: 0 6px 25px rgba(0,128,255,0.45);
}

/* ══ LIGHT MODE ════════════════════════════════════════════════ */
body.light-theme {
  --bg:      #f0f4f8;
  --bg2:     #e4ecf4;
  --bg3:     #dce6f0;
  --panel:   #ffffff;
  --panel2:  #eaf1f8;
  --border:  #b0c8e0;
  --border2: #8aafd0;
  --accent:  #0080cc;
  --accent2: #005fa3;
  --accent3: #007a55;
  --warn:    #c94a1a;
  --text:    #1e3148;
  --text2:   #3d6080;
  --text3:   #6a8fad;
  --white:   #0d1f35;
  --green:   #007a55;
  --glow:    0 0 12px rgba(0,128,204,0.10);
  --glow2:   0 0 20px rgba(0,128,204,0.18);
  --grid-line: rgba(0,100,180,0.05);
  --header-bg: linear-gradient(180deg, #c8ddef 0%, #dce8f5 100%);
  --tab-active-bg: #ffffff;
  --input-bg: #f7fafd;
  --result-bg: #eaf1f8;
  --side-header-bg: #dce8f5;
  --btn-calc-bg: linear-gradient(135deg, #005aa0, #0080cc);
  --btn-calc-shadow: 0 4px 16px rgba(0,100,180,0.25);
  --btn-calc-shadow-hover: 0 6px 22px rgba(0,100,180,0.40);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--body);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.3s, color 0.3s;
}

/* Grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ── HEADER ─────────────────────────────── */
header {
  position: relative;
  z-index: 10;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  padding: 18px 32px;
  display: flex;
  align-items: center;
  gap: 20px;
  transition: background 0.3s, border-color 0.3s;
}

.logo-icon {
  width: 42px; height: 42px;
  border: 2px solid var(--accent);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--glow);
  flex-shrink: 0;
  transition: border-color 0.3s, box-shadow 0.3s;
  padding: 2px; /*Recuerdame que agregue esto*/
}

.logo-img {
  width: 100%;
  height: 100%;
  object-fit: contain; 
  border-radius: 5px; 
  display: block;
}
/*.logo-icon svg { width: 24px; height: 24px; }

body.light-theme .logo-icon svg { stroke: var(--accent); }
*/

.header-title {
  font-family: var(--head);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--white);
}

.header-subtitle {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 2px;
  margin-top: 2px;
}

.header-badge {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--accent3);
  border: 1px solid var(--accent3);
  padding: 3px 10px;
  border-radius: 3px;
  letter-spacing: 1px;
  opacity: 0.7;
}

/* ── MAIN LAYOUT ─────────────────────────── */
.main-wrap {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 20px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 24px 40px;
}

/* ── LEFT COLUMN ─────────────────────────── */
.left-col { display: flex; flex-direction: column; gap: 0; }

/* Model tabs */
.model-tabs {
  display: flex;
  gap: 2px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  padding: 6px 6px 0;
  overflow: hidden;
  transition: background 0.3s, border-color 0.3s;
}

.tab-btn {
  flex: 1;
  padding: 10px 8px;
  background: transparent;
  border: none;
  border-radius: 6px 6px 0 0;
  color: var(--text3);
  font-family: var(--head);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.tab-btn:hover { color: var(--text); background: rgba(0,128,200,0.06); }

.tab-btn.active {
  background: var(--tab-active-bg);
  color: var(--accent);
  border-top: 2px solid var(--accent);
  box-shadow: 0 -2px 10px rgba(0,128,200,0.1);
}

/* Model panel */
.model-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 0 0 10px 10px;
  padding: 24px;
  display: none;
  transition: background 0.3s, border-color 0.3s;
}

.model-panel.active { display: block; }

/* Model description box */
.model-desc {
  background: rgba(0,128,200,0.05);
  border-left: 3px solid var(--accent2);
  padding: 12px 16px;
  margin-bottom: 22px;
  border-radius: 0 6px 6px 0;
}

.model-desc h3 {
  font-family: var(--head);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.model-desc p {
  font-size: 12px;
  line-height: 1.7;
  color: var(--text2);
}

/* Section titles */
.section-title {
  font-family: var(--head);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--text3);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* Grid for inputs */
.input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 20px;
}

.input-grid.three { grid-template-columns: 1fr 1fr 1fr; }
.input-grid.full  { grid-template-columns: 1fr; }

/* Input group */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.input-group label {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text3);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.input-row {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  background: var(--input-bg);
  transition: border-color 0.2s, box-shadow 0.2s, background 0.3s;
}

.input-row:focus-within {
  border-color: var(--accent2);
  box-shadow: 0 0 0 2px rgba(0,128,200,0.12);
}

.input-row input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  padding: 10px 12px;
  color: var(--white);
  font-family: var(--mono);
  font-size: 13px;
  min-width: 0;
}

.input-row input::placeholder { color: var(--text3); }

.input-row .unit-select {
  background: var(--panel2);
  border: none;
  border-left: 1px solid var(--border);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 11px;
  padding: 0 10px;
  cursor: pointer;
  outline: none;
  min-width: 60px;
  transition: background 0.3s;
}

.input-row .unit-label {
  background: var(--panel2);
  border-left: 1px solid var(--border);
  color: var(--text2);
  font-family: var(--mono);
  font-size: 11px;
  padding: 0 12px;
  display: flex;
  align-items: center;
  min-width: 60px;
  justify-content: center;
  transition: background 0.3s;
}

/* Building section */
.building-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 14px; }

.building-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  transition: background 0.3s, border-color 0.3s;
}

.building-item .b-label {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text3);
  min-width: 80px;
}

.building-item input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--white);
  font-family: var(--mono);
  font-size: 13px;
  min-width: 0;
}

.building-item .unit-label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  min-width: 24px;
}

.btn-del {
  background: rgba(255,107,53,0.15);
  border: 1px solid rgba(255,107,53,0.3);
  color: var(--warn);
  width: 26px; height: 26px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

.btn-del:hover { background: rgba(255,107,53,0.3); }

.btn-add {
  background: rgba(0,128,200,0.08);
  border: 1px dashed var(--border2);
  color: var(--accent);
  padding: 9px;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--head);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  text-align: center;
  transition: all 0.2s;
  width: 100%;
}

.btn-add:hover { background: rgba(0,128,200,0.16); border-color: var(--accent); }

/* Divider */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 20px 0;
}

/* Calculate button */
.btn-calc {
  width: 100%;
  padding: 14px;
  background: var(--btn-calc-bg);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-family: var(--head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--btn-calc-shadow);
  margin-bottom: 20px;
  position: relative;
  overflow: hidden;
}

.btn-calc::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent, rgba(255,255,255,0.1));
  opacity: 0;
  transition: opacity 0.2s;
}

.btn-calc:hover { transform: translateY(-1px); box-shadow: var(--btn-calc-shadow-hover); }
.btn-calc:hover::after { opacity: 1; }
.btn-calc:active { transform: translateY(0); }

/* Results */
.results-box {
  background: var(--input-bg);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 18px;
  display: none;
  transition: background 0.3s, border-color 0.3s;
}

.results-box.visible { display: block; animation: fadeIn 0.3s ease; }

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

.results-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.results-grid.three { grid-template-columns: 1fr 1fr 1fr; }

.result-item {
  background: var(--result-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  transition: background 0.3s, border-color 0.3s;
}

.result-item .r-label {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text3);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.result-item .r-value {
  font-family: var(--mono);
  font-size: 16px;
  color: var(--accent3);
  font-weight: 400;
}

.result-item .r-unit {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  margin-left: 4px;
}

.result-item.highlight {
  border-color: var(--accent3);
  background: rgba(0,180,130,0.06);
  box-shadow: 0 0 14px rgba(0,180,130,0.08);
}

.result-item.highlight .r-value { color: var(--accent3); font-size: 18px; }

/* Error */
.error-msg {
  background: rgba(255,107,53,0.10);
  border: 1px solid rgba(255,107,53,0.30);
  color: var(--warn);
  padding: 10px 14px;
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 12px;
  margin-bottom: 10px;
  display: none;
}

/* ── RIGHT COLUMN ─────────────────────────── */
.right-col { display: flex; flex-direction: column; gap: 16px; }

.side-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  transition: background 0.3s, border-color 0.3s;
}

.side-panel-header {
  padding: 12px 16px;
  background: var(--side-header-bg);
  border-bottom: 1px solid var(--border);
  font-family: var(--head);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background 0.3s, border-color 0.3s;
}

/* Theme toggle button */
.btn-theme-toggle {
  width: 100%;
  padding: 9px 14px;
  background: rgba(0,128,200,0.08);
  border: 1px solid var(--border2);
  border-radius: 6px;
  color: var(--accent);
  font-family: var(--head);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s;
}

.btn-theme-toggle:hover {
  background: rgba(0,128,200,0.18);
  border-color: var(--accent);
}

/* Dictionary table */
.dict-table { width: 100%; border-collapse: collapse; }

.dict-table th {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text3);
  padding: 8px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  background: rgba(0,0,0,0.06);
}

.dict-table td {
  padding: 7px 14px;
  font-family: var(--mono);
  font-size: 11px;
  border-bottom: 1px solid rgba(100,160,210,0.15);
  transition: background 0.15s;
}

.dict-table tr:hover td { background: rgba(0,128,200,0.05); }

.dict-table .sym   { color: var(--accent); font-weight: 400; }
.dict-table .param { color: var(--text2); }
.dict-table .un    { color: var(--text3); }

/* Converter */
.converter { padding: 14px 16px; }

.conv-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.conv-select {
  flex: 1;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 11px;
  padding: 7px 8px;
  outline: none;
  cursor: pointer;
  min-width: 0;
  transition: background 0.3s, border-color 0.3s, color 0.3s;
}

.conv-select:focus { border-color: var(--accent2); }

.conv-eq {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 14px;
  flex-shrink: 0;
}

.conv-input {
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--white);
  font-family: var(--mono);
  font-size: 13px;
  padding: 7px 10px;
  outline: none;
  width: 100%;
  transition: background 0.3s, border-color 0.3s, color 0.3s;
}

.conv-input:focus { border-color: var(--accent2); }

/* Scrollable dict */
.dict-scroll { max-height: 260px; overflow-y: auto; }
.dict-scroll::-webkit-scrollbar { width: 4px; }
.dict-scroll::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

/* Equation panel */
.eq-list { padding: 14px 16px; display: flex; flex-direction: column; gap: 10px; }

.eq-item {
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  transition: background 0.3s, border-color 0.3s;
}

.eq-item .eq-name {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--text3);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 5px;
}

.eq-item .eq-formula {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  word-break: break-all;
}

/* Uplink/downlink sub-tabs */
.sub-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 18px;
}

.sub-tab {
  padding: 6px 16px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text3);
  font-family: var(--head);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.2s;
}

.sub-tab.active {
  background: rgba(0,128,200,0.10);
  border-color: var(--accent2);
  color: var(--accent);
}

.sub-tab:hover:not(.active) { color: var(--text); }

.sub-panel { display: none; }
.sub-panel.active { display: block; }

/* Tooltip */
[title] { cursor: help; }

/* Responsive */
@media (max-width: 900px) {
  .main-wrap { grid-template-columns: 1fr; }
  .right-col { order: -1; }
}