/* ===== CSS VARIABLES — DARK MAGENTA THEME (default) ===== */
:root,
[data-theme="dark"] {
  --bg:        #0d0010;
  --bg2:       #160019;
  --bg3:       #220028;
  --card:      #160019;
  --border:    #2e0038;
  --border2:   #4a0060;
  --accent:    #e040fb;
  --accent2:   #aa00cc;
  --accent-glow: rgba(224,64,251,0.20);
  --text:      #fdf0ff;
  --text2:     #ce93d8;
  --text3:     #9c4daa;
  --success:   #69f0ae;
  --warning:   #ffca28;
  --danger:    #ff5252;
  --radius:    14px;
  --shadow:    0 4px 32px rgba(0,0,0,0.6);
  --header-bg: rgba(13,0,16,0.97);
  --input-bg:  #0d0010;
  --chart-grid: rgba(46,0,56,0.9);
}

/* ===== LIGHT MAGENTA THEME ===== */
[data-theme="light"] {
  --bg:        #fce4ff;
  --bg2:       #ffffff;
  --bg3:       #f3d0fa;
  --card:      #ffffff;
  --border:    #e8b4f0;
  --border2:   #d07de0;
  --accent:    #c2185b;
  --accent2:   #880e4f;
  --accent-glow: rgba(194,24,91,0.14);
  --text:      #1a001f;
  --text2:     #6a1b6a;
  --text3:     #ab47bc;
  --success:   #2e7d32;
  --warning:   #e65100;
  --danger:    #c62828;
  --radius:    14px;
  --shadow:    0 4px 24px rgba(194,24,91,0.12);
  --header-bg: rgba(252,228,255,0.97);
  --input-bg:  #fdf0ff;
  --chart-grid: rgba(208,125,224,0.3);
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

/* ===== AUTH OVERLAY ===== */
.auth-overlay {
  position: fixed; inset: 0; z-index: 1000;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}

.auth-box {
  background: var(--card);
  border: 1px solid var(--border2);
  border-radius: 20px;
  padding: 40px 36px;
  width: 100%; max-width: 420px;
  box-shadow: var(--shadow), 0 0 60px var(--accent-glow);
}

.auth-logo {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 28px;
}
.auth-logo-title { font-size: 20px; font-weight: 700; color: var(--text); }
.auth-logo-sub { font-size: 12px; color: var(--text3); font-family: 'JetBrains Mono', monospace; }

.auth-tabs {
  display: flex; gap: 4px;
  background: var(--bg3);
  border-radius: 10px; padding: 4px;
  margin-bottom: 24px;
}
.auth-tab {
  flex: 1; padding: 9px; border: none; border-radius: 8px;
  font-size: 14px; font-weight: 600; cursor: pointer;
  background: none; color: var(--text2); transition: all 0.2s;
}
.auth-tab.active { background: var(--accent); color: white; box-shadow: 0 2px 8px var(--accent-glow); }

.auth-form { display: flex; flex-direction: column; gap: 16px; }
.auth-field { display: flex; flex-direction: column; gap: 6px; }
.auth-field label { font-size: 13px; font-weight: 500; color: var(--text2); }
.auth-field input {
  background: var(--input-bg); border: 1.5px solid var(--border2);
  color: var(--text); padding: 11px 14px; border-radius: 10px;
  font-size: 14px; outline: none; transition: border-color 0.2s, box-shadow 0.2s;
}
.auth-field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.optional { color: var(--text3); font-weight: 400; font-size: 11px; }

.auth-submit {
  padding: 13px; background: var(--accent);
  border: none; border-radius: 10px; color: white;
  font-size: 15px; font-weight: 600; cursor: pointer;
  transition: all 0.2s; margin-top: 4px;
  box-shadow: 0 4px 16px var(--accent-glow);
}
.auth-submit:hover { background: var(--accent2); transform: translateY(-1px); }
.auth-submit:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.auth-error {
  background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3);
  color: var(--danger); padding: 10px 14px; border-radius: 8px; font-size: 13px;
}
.auth-switch { text-align: center; font-size: 13px; color: var(--text3); }
.auth-switch a { color: var(--accent); text-decoration: none; font-weight: 500; }
.auth-switch a:hover { text-decoration: underline; }

/* ===== HEADER ===== */
.header {
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(16px);
  position: sticky; top: 0; z-index: 100;
}
.header-inner {
  max-width: 1280px; margin: 0 auto;
  padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 16px;
}
.logo { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.logo-title { font-size: 16px; font-weight: 700; color: var(--text); }
.logo-sub { font-size: 10px; color: var(--text3); font-family: 'JetBrains Mono', monospace; }

.nav { display: flex; gap: 4px; }
.nav-btn {
  background: none; border: none; color: var(--text2);
  padding: 8px 14px; border-radius: 8px; cursor: pointer;
  font-size: 13px; font-weight: 500; transition: all 0.2s; white-space: nowrap;
}
.nav-btn:hover { background: var(--bg3); color: var(--text); }
.nav-btn.active { background: var(--accent); color: white; }

.header-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

/* Theme Toggle */
.theme-toggle {
  width: 38px; height: 38px; border-radius: 10px;
  background: var(--bg3); border: 1px solid var(--border2);
  font-size: 18px; cursor: pointer; display: flex;
  align-items: center; justify-content: center;
  transition: all 0.2s;
}
.theme-toggle:hover { background: var(--accent); border-color: var(--accent); }

.user-pill {
  display: flex; align-items: center; gap: 8px;
  background: var(--bg3); border: 1px solid var(--border2);
  padding: 6px 12px; border-radius: 20px;
}
.user-avatar {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: white;
  font-size: 12px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
#user-name-display { font-size: 13px; font-weight: 500; color: var(--text); }

.btn-logout {
  background: none; border: 1px solid var(--border2);
  color: var(--text2); padding: 7px 14px; border-radius: 8px;
  font-size: 13px; cursor: pointer; transition: all 0.2s;
}
.btn-logout:hover { border-color: var(--danger); color: var(--danger); }

/* ===== MAIN ===== */
.main { max-width: 1280px; margin: 0 auto; padding: 32px 24px; }
.tab { display: none; }
.tab.active { display: block; }
.mt-4 { margin-top: 24px; }

.page-title { margin-bottom: 28px; }
.page-title h1 { font-size: 26px; font-weight: 700; color: var(--text); }
.page-title p { color: var(--text2); font-size: 14px; margin-top: 4px; }

/* ===== CARDS ===== */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: background 0.3s, border-color 0.3s;
}
.card-header { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 20px; }
.card-icon { font-size: 22px; margin-top: 2px; }
.card-header h2 { font-size: 16px; font-weight: 600; color: var(--text); }
.card-header p { font-size: 12px; color: var(--text2); margin-top: 2px; }

/* ===== BUILDER ===== */
.builder-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 800px) { .builder-grid { grid-template-columns: 1fr; } }

.field-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.field-row label { font-size: 14px; font-weight: 500; color: var(--text2); }

.stepper { display: flex; align-items: center; gap: 12px; }
.stepper button {
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--bg3); border: 1px solid var(--border2);
  color: var(--text); font-size: 18px; cursor: pointer;
  display: flex; align-items: center; justify-content: center; transition: background 0.2s;
}
.stepper button:hover { background: var(--accent); border-color: var(--accent); color: white; }
.stepper span { font-size: 18px; font-weight: 700; min-width: 24px; text-align: center; color: var(--text); }

.link-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px; padding: 14px 16px; margin-bottom: 10px;
  display: grid; grid-template-columns: auto 1fr 1fr; gap: 12px; align-items: center;
  transition: border-color 0.2s;
}
.link-item:hover { border-color: var(--accent); }
.link-badge {
  background: var(--accent); color: white;
  font-size: 11px; font-weight: 700; padding: 4px 9px; border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
}
.link-field { display: flex; flex-direction: column; gap: 4px; }
.link-field label { font-size: 11px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.5px; }
.link-field input {
  background: var(--input-bg); border: 1.5px solid var(--border2);
  color: var(--text); padding: 8px 10px; border-radius: 8px;
  font-size: 14px; font-family: 'JetBrains Mono', monospace;
  width: 100%; outline: none; transition: border-color 0.2s;
}
.link-field input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

.field-group { margin-bottom: 20px; }
.field-group > label { display: block; font-size: 14px; font-weight: 500; color: var(--text2); margin-bottom: 8px; }
.field-group input[type="number"] {
  width: 100%; background: var(--input-bg); border: 1.5px solid var(--border2);
  color: var(--text); padding: 11px 14px; border-radius: 10px;
  font-size: 16px; font-family: 'JetBrains Mono', monospace;
  outline: none; transition: border-color 0.2s;
}
.field-group input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

.force-type-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.force-card {
  background: var(--bg); border: 2px solid var(--border2);
  border-radius: 10px; padding: 14px 10px; cursor: pointer;
  text-align: center; transition: all 0.2s;
  display: flex; flex-direction: column; align-items: center; gap: 4px;
}
.force-card input { display: none; }
.force-card.active { border-color: var(--accent); background: var(--accent-glow); }
.force-card:hover { border-color: var(--accent); }
.ft-icon { font-size: 22px; }
.ft-name { font-size: 13px; font-weight: 600; color: var(--text); }
.ft-desc { font-size: 11px; color: var(--text3); font-family: 'JetBrains Mono', monospace; }

.preset-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.label-sm { font-size: 12px; color: var(--text3); }
.preset-btn {
  background: var(--bg3); border: 1px solid var(--border2);
  color: var(--text2); padding: 6px 12px; border-radius: 6px;
  font-size: 12px; cursor: pointer; transition: all 0.2s;
}
.preset-btn:hover { background: var(--accent); color: white; border-color: var(--accent); }

/* ===== BUTTONS ===== */
.btn-primary {
  width: 100%; padding: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none; border-radius: 10px; color: white;
  font-size: 15px; font-weight: 600; cursor: pointer;
  transition: all 0.2s; margin-top: 8px;
  box-shadow: 0 4px 16px var(--accent-glow);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 24px var(--accent-glow); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.btn-secondary {
  background: var(--bg3); border: 1px solid var(--border2);
  color: var(--text); padding: 10px 20px; border-radius: 8px;
  font-size: 14px; cursor: pointer; transition: all 0.2s;
}
.btn-secondary:hover { background: var(--accent); border-color: var(--accent); color: white; }

.btn-pdf {
  background: linear-gradient(135deg, #dc2626, #b91c1c);
  border: none; color: white; padding: 11px 22px;
  border-radius: 8px; font-size: 14px; font-weight: 600;
  cursor: pointer; transition: all 0.2s;
  box-shadow: 0 4px 12px rgba(220,38,38,0.3);
}
.btn-pdf:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(220,38,38,0.4); }

/* ===== CANVAS ===== */
#suspension-canvas {
  width: 100%; height: 280px;
  background: var(--bg); border-radius: 8px;
  border: 1px solid var(--border); display: block;
}

/* ===== RESULTS ===== */
.results-header { display: flex; align-items: flex-start; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

.summary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 16px; }
.summary-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; text-align: center;
  transition: border-color 0.2s;
}
.summary-card:hover { border-color: var(--accent); }
.summary-card .s-label { font-size: 11px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.5px; }
.summary-card .s-value { font-size: 22px; font-weight: 700; color: var(--accent); margin: 6px 0; font-family: 'JetBrains Mono', monospace; }
.summary-card .s-sub { font-size: 11px; color: var(--text2); }
.summary-card.danger .s-value { color: var(--danger); }
.summary-card.success .s-value { color: var(--success); }

.matrix-wrap { overflow-x: auto; font-family: 'JetBrains Mono', monospace; font-size: 13px; }
.matrix-table { border-collapse: collapse; width: 100%; }
.matrix-table th {
  background: var(--bg3); color: var(--text2);
  padding: 8px 14px; font-size: 11px; text-transform: uppercase;
  border: 1px solid var(--border);
}
.matrix-table td { padding: 8px 14px; border: 1px solid var(--border); text-align: center; color: var(--text); }
.matrix-table tr:nth-child(even) td { background: var(--bg3); }
.matrix-label { color: var(--accent); font-weight: 600; }

.results-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 900px) { .results-grid { grid-template-columns: 1fr; } }

.chart-wrap { position: relative; height: 280px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
thead th {
  background: var(--bg3); color: var(--text2);
  padding: 10px 14px; text-align: left;
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
}
tbody td { padding: 10px 14px; border-bottom: 1px solid var(--border); color: var(--text); }
tbody tr:hover td { background: var(--accent-glow); }
.badge-max { background: rgba(239,68,68,0.15); color: var(--danger); padding: 3px 8px; border-radius: 4px; font-size: 11px; font-weight: 600; }
.badge-ok { background: rgba(16,185,129,0.1); color: var(--success); padding: 3px 8px; border-radius: 4px; font-size: 11px; }

/* ===== HISTORY ===== */
.history-toolbar { margin-bottom: 20px; }
.history-list { display: flex; flex-direction: column; gap: 14px; }
.history-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px;
  display: grid; grid-template-columns: 1fr auto;
  gap: 12px; align-items: center; transition: border-color 0.2s;
}
.history-card:hover { border-color: var(--accent); }
.history-title { font-size: 14px; font-weight: 600; color: var(--text); }
.history-time { font-size: 11px; color: var(--text3); margin-top: 2px; }
.history-meta { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 8px; }
.history-tag {
  background: var(--bg3); color: var(--text2);
  padding: 3px 10px; border-radius: 4px; font-size: 12px;
  font-family: 'JetBrains Mono', monospace;
}
.history-tag.accent { background: var(--accent-glow); color: var(--accent); }
.history-actions { display: flex; gap: 8px; }
.btn-load { background: var(--accent); border: none; color: white; padding: 7px 14px; border-radius: 6px; font-size: 12px; cursor: pointer; }
.btn-del { background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3); color: var(--danger); padding: 7px 14px; border-radius: 6px; font-size: 12px; cursor: pointer; }

/* ===== EMPTY STATE ===== */
.empty-state { text-align: center; padding: 80px 20px; }
.empty-icon { font-size: 56px; margin-bottom: 16px; }
.empty-state h2 { font-size: 20px; color: var(--text); margin-bottom: 8px; }
.empty-state p { color: var(--text2); margin-bottom: 24px; }

/* ===== ERROR ===== */
.error-msg {
  background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3);
  color: var(--danger); padding: 10px 14px; border-radius: 8px;
  font-size: 13px; margin-top: 10px;
}

/* ===== CHATBOT ===== */
#chatbot-bubble {
  position: fixed; bottom: 28px; right: 28px;
  width: 58px; height: 58px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; cursor: pointer; z-index: 200;
  box-shadow: 0 4px 24px var(--accent-glow);
  transition: transform 0.2s;
}
#chatbot-bubble:hover { transform: scale(1.1); }

.chatbot-panel {
  position: fixed; bottom: 100px; right: 28px;
  width: 370px; max-height: 530px;
  background: var(--card); border: 1px solid var(--border2);
  border-radius: 18px; box-shadow: 0 8px 48px rgba(0,0,0,0.4);
  display: flex; flex-direction: column; z-index: 200; overflow: hidden;
}
.chat-header {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  padding: 14px 16px;
  display: flex; align-items: center; justify-content: space-between;
}
.chat-title { display: flex; align-items: center; gap: 10px; font-size: 20px; }
.chat-name { font-size: 14px; font-weight: 600; color: white; }
.chat-status { font-size: 11px; color: rgba(255,255,255,0.75); }
.chat-close { background: none; border: none; color: white; font-size: 18px; cursor: pointer; opacity: 0.8; }
.chat-close:hover { opacity: 1; }

.chat-messages {
  flex: 1; overflow-y: auto; padding: 16px;
  display: flex; flex-direction: column; gap: 10px;
}
.chat-msg { display: flex; }
.chat-msg.bot { justify-content: flex-start; }
.chat-msg.user { justify-content: flex-end; }
.msg-bubble {
  max-width: 85%; padding: 10px 14px; border-radius: 12px;
  font-size: 13px; line-height: 1.5;
}
.chat-msg.bot .msg-bubble { background: var(--bg3); color: var(--text); border-bottom-left-radius: 4px; }
.chat-msg.user .msg-bubble { background: var(--accent); color: white; border-bottom-right-radius: 4px; }
.msg-typing { color: var(--text3); font-style: italic; }

.chat-input-row {
  display: flex; gap: 8px; padding: 12px 14px;
  border-top: 1px solid var(--border);
}
.chat-input-row input {
  flex: 1; background: var(--input-bg); border: 1.5px solid var(--border2);
  color: var(--text); padding: 9px 12px; border-radius: 8px;
  font-size: 13px; outline: none;
}
.chat-input-row input:focus { border-color: var(--accent); }
.chat-input-row button {
  background: var(--accent); border: none; color: white;
  padding: 9px 16px; border-radius: 8px; font-size: 13px;
  font-weight: 600; cursor: pointer;
}

/* ===== UTILS ===== */
.hidden { display: none !important; }