:root {
  --km-bg: #020616;
  --km-bg-elevated: #050b22;
  --km-bg-soft: rgba(17, 24, 39, 0.85);
  --km-accent: #3b82f6;
  --km-accent-soft: rgba(59, 130, 246, 0.3);
  --km-accent-2: #fbbf24;
  --km-text: #e5e7eb;
  --km-text-soft: #9ca3af;
  --km-border: rgba(148, 163, 184, 0.25);
  --km-radius-lg: 18px;
  --km-radius-xl: 26px;
  --km-shadow-soft: 0 22px 55px rgba(15, 23, 42, 0.9);
}

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

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  color: var(--km-text);
  background: radial-gradient(circle at top left, #1d4ed8 0, transparent 40%),
              radial-gradient(circle at bottom right, #f97316 0, transparent 45%),
              var(--km-bg);
}

body {
  display: flex;
}

/* Root layout */

.km-root {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 18px 18px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Header */

.km-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-radius: 999px;
  background: linear-gradient(120deg, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.94));
  border: 1px solid rgba(148, 163, 184, 0.5);
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(18px);
}

.km-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.km-logo-orb {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 20%, #e5e7eb, #3b82f6 40%, #0f172a 80%);
  box-shadow:
    0 0 22px rgba(59, 130, 246, 0.9),
    0 0 60px rgba(37, 99, 235, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 22px;
  color: #0b1020;
}

.km-logo-text h1 {
  margin: 0;
  font-size: 24px;
  letter-spacing: 0.04em;
}

.km-logo-text p {
  margin: 0;
  font-size: 13px;
  color: var(--km-text-soft);
}

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

/* Chips & buttons */

.km-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  border: 1px solid var(--km-border);
  background: rgba(15, 23, 42, 0.85);
  color: var(--km-text-soft);
}

.km-chip--ok {
  border-color: rgba(52, 211, 153, 0.6);
  color: #bbf7d0;
  background: rgba(6, 95, 70, 0.22);
}

.km-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 12px rgba(34, 197, 94, 0.9);
}

.km-btn {
  border: none;
  outline: none;
  cursor: pointer;
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 500;
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  color: white;
  box-shadow:
    0 8px 26px rgba(37, 99, 235, 0.65),
    0 0 0 1px rgba(129, 140, 248, 0.8);
  transition: transform 0.1s ease, box-shadow 0.1s ease, background 0.2s ease;
}

.km-btn:hover {
  transform: translateY(-1px);
  box-shadow:
    0 14px 35px rgba(37, 99, 235, 0.85),
    0 0 0 1px rgba(129, 140, 248, 1);
}

.km-btn:active {
  transform: translateY(0);
  box-shadow:
    0 8px 22px rgba(37, 99, 235, 0.7),
    0 0 0 1px rgba(79, 70, 229, 0.9);
}

.km-btn--ghost {
  background: transparent;
  border-radius: 999px;
  padding: 7px 16px;
  color: var(--km-text);
  border: 1px solid rgba(148, 163, 184, 0.7);
  box-shadow: 0 0 0 1px rgba(30, 64, 175, 0.4);
}

.km-btn--full {
  width: 100%;
}

/* Main layout */

.km-main {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1.1fr);
  gap: 16px;
  align-items: stretch;
}

.km-panel {
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.05), transparent 40%),
              radial-gradient(circle at bottom right, rgba(251, 191, 36, 0.08), transparent 45%),
              rgba(15, 23, 42, 0.94);
  border-radius: var(--km-radius-xl);
  border: 1px solid rgba(148, 163, 184, 0.4);
  box-shadow: var(--km-shadow-soft);
  padding: 16px 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  backdrop-filter: blur(20px);
}

.km-panel--chat {
  min-height: 540px;
}

.km-panel--side {
  min-height: 540px;
}

/* Panel header */

.km-panel-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 4px 4px 8px;
}

.km-panel-header--tight {
  padding-top: 0;
}

.km-panel-header h2 {
  margin: 0;
  font-size: 18px;
}

.km-panel-header p {
  margin: 0;
  font-size: 13px;
  color: var(--km-text-soft);
}

/* Mode toggle */

.km-mode-toggle {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.km-chip--mode {
  cursor: pointer;
  user-select: none;
  background: rgba(15, 23, 42, 0.9);
}

.km-chip--mode.km-chip--active {
  border-color: rgba(59, 130, 246, 0.8);
  background: linear-gradient(120deg, rgba(59, 130, 246, 0.45), rgba(37, 99, 235, 0.2));
  color: #e5edff;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.65);
}

/* Chat window */

.km-chat-window {
  flex: 1;
  border-radius: 18px;
  background: radial-gradient(circle at top left, rgba(129, 140, 248, 0.12), transparent 55%),
              rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(55, 65, 81, 0.9);
  padding: 12px 12px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.km-chat-empty {
  text-align: left;
  font-size: 13px;
  color: var(--km-text-soft);
}

.km-chat-empty ul {
  padding-left: 16px;
  margin: 6px 0 0;
}

.km-chat-message {
  max-width: 92%;
  padding: 8px 10px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.4;
  position: relative;
}

.km-chat-message--user {
  align-self: flex-end;
  background: linear-gradient(135deg, #1d4ed8, #4f46e5);
  color: white;
  border-bottom-right-radius: 3px;
}

.km-chat-message--ai {
  align-self: flex-start;
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.7);
  border-bottom-left-radius: 3px;
}

.km-chat-meta {
  font-size: 11px;
  color: var(--km-text-soft);
  margin-top: 3px;
}

/* Chat input */

.km-chat-input {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 4px;
}

.km-chat-input textarea {
  resize: vertical;
  min-height: 54px;
  max-height: 140px;
  border-radius: 16px;
  border: 1px solid rgba(75, 85, 99, 0.9);
  background: rgba(15, 23, 42, 0.95);
  color: var(--km-text);
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
}

.km-chat-input textarea:focus {
  border-color: rgba(59, 130, 246, 0.9);
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.9);
}

.km-chat-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

/* Tabs right panel */

.km-tabs {
  display: flex;
  background: rgba(15, 23, 42, 0.9);
  border-radius: 999px;
  padding: 3px;
  border: 1px solid rgba(75, 85, 99, 0.9);
}

.km-tab {
  flex: 1;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--km-text-soft);
  font-size: 13px;
  padding: 7px 8px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.km-tab--active {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.35), rgba(59, 130, 246, 0.1));
  color: var(--km-text);
}

.km-tab-content {
  display: none;
  margin-top: 10px;
  flex: 1;
  min-height: 0;
}

.km-tab-content--active {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Upload zone */

.km-upload-zone {
  border-radius: 16px;
  border: 1px dashed rgba(148, 163, 184, 0.65);
  background: rgba(15, 23, 42, 0.85);
  padding: 14px;
  position: relative;
  cursor: pointer;
}

.km-upload-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.km-upload-inner {
  text-align: center;
  font-size: 13px;
  color: var(--km-text-soft);
}

.km-upload-hint {
  font-size: 12px;
  margin-top: 4px;
  opacity: 0.9;
}

.km-link {
  color: var(--km-accent-2);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Filters & course list */

.km-filter-row {
  display: flex;
  gap: 8px;
}

.km-select {
  flex: 1;
  border-radius: 999px;
  border: 1px solid rgba(75, 85, 99, 0.9);
  background: rgba(17, 24, 39, 0.95);
  color: var(--km-text);
  font-size: 13px;
  padding: 6px 10px;
}

.km-course-list {
  flex: 1;
  overflow-y: auto;
  border-radius: 14px;
  border: 1px solid rgba(55, 65, 81, 0.9);
  background: rgba(15, 23, 42, 0.95);
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.km-course-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 7px 8px;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.98);
  border: 1px solid rgba(55, 65, 81, 0.9);
  font-size: 13px;
}

.km-course-main {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.km-course-title {
  font-weight: 500;
}

.km-course-meta {
  font-size: 11px;
  color: var(--km-text-soft);
}

.km-pill {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.7);
  color: var(--km-text-soft);
}

/* Planner */

.km-planner-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.km-field-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
}

.km-field-row label {
  color: var(--km-text-soft);
}

.km-field-row input {
  border-radius: 999px;
  border: 1px solid rgba(75, 85, 99, 0.9);
  background: rgba(15, 23, 42, 0.96);
  color: var(--km-text);
  padding: 6px 10px;
  font-size: 13px;
  outline: none;
}

.km-field-row input:focus {
  border-color: rgba(59, 130, 246, 0.9);
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.9);
}

.km-field-row--2 {
  flex-direction: row;
  gap: 8px;
}

.km-field-row--2 > div {
  flex: 1;
}

.km-planner-list {
  flex: 1;
  margin-top: 8px;
  border-radius: 14px;
  border: 1px solid rgba(55, 65, 81, 0.9);
  background: rgba(15, 23, 42, 0.96);
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
}

.km-plan-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 8px;
  border-radius: 12px;
  background: rgba(17, 24, 39, 0.98);
  border: 1px solid rgba(55, 65, 81, 0.9);
  font-size: 13px;
}

.km-plan-item input[type="checkbox"] {
  width: 15px;
  height: 15px;
}

.km-plan-main {
  flex: 1;
}

.km-plan-title {
  font-weight: 500;
}

.km-plan-meta {
  font-size: 11px;
  color: var(--km-text-soft);
}

/* Stats */

.km-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.km-stat-card {
  padding: 10px;
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.98);
  border: 1px solid rgba(55, 65, 81, 0.9);
}

.km-stat-label {
  font-size: 11px;
  color: var(--km-text-soft);
}

.km-stat-value {
  margin-top: 4px;
  font-size: 18px;
  font-weight: 600;
}

.km-chart {
  margin-top: 10px;
  width: 100%;
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.98);
  border: 1px solid rgba(55, 65, 81, 0.9);
}

/* Footer */

.km-footer {
  font-size: 11px;
  color: var(--km-text-soft);
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 4px 4px 0;
}

.km-footer-right {
  opacity: 0.9;
}

/* Responsive */

@media (max-width: 1024px) {
  .km-main {
    grid-template-columns: 1fr;
  }

  .km-panel--chat,
  .km-panel--side {
    min-height: 0;
  }
}

@media (max-width: 640px) {
  .km-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .km-header-right {
    align-self: stretch;
    justify-content: space-between;
  }

  .km-root {
    padding: 12px 10px 18px;
  }

  .km-panel {
    padding: 14px 12px 12px;
  }
}