/* ═══════════════════════════════════════════════════════════════════════
   AGA Follicle Analyzer — Styles
   ═══════════════════════════════════════════════════════════════════════ */

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

:root {
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --clr-bg: #f0f2f5;
  --clr-surface: #ffffff;
  --clr-border: #e0e3e8;
  --clr-text: #1a1d23;
  --clr-text-muted: #6b7280;

  --clr-primary: #3b82f6;
  --clr-primary-hover: #2563eb;
  --clr-accent: #8b5cf6;
  --clr-accent-hover: #7c3aed;
  --clr-success: #10b981;
  --clr-success-hover: #059669;
  --clr-danger: #ef4444;

  --clr-one: #4caf50;
  --clr-two: #ffc107;
  --clr-multiple: #f44336;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --transition: 0.2s ease;
}

/* ── Dark mode overrides ────────────────────────────────────────────── */
[data-theme="dark"] {
  --clr-bg: #111318;
  --clr-surface: #1a1d23;
  --clr-border: #2d3139;
  --clr-text: #e4e7ec;
  --clr-text-muted: #9ca3af;

  --clr-primary: #60a5fa;
  --clr-primary-hover: #3b82f6;
  --clr-accent: #a78bfa;
  --clr-accent-hover: #8b5cf6;
  --clr-success: #34d399;
  --clr-success-hover: #10b981;
  --clr-danger: #f87171;

  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

html {
  font-size: 15px;
}

body {
  font-family: var(--font);
  background: var(--clr-bg);
  color: var(--clr-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ─────────────────────────────────────────────────────────── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header__brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header__icon {
  width: 28px;
  height: 28px;
  color: var(--clr-primary);
}

.header h1 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header__badge {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--clr-accent);
  background: rgba(139, 92, 246, 0.1);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
}

.header__controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.btn--header {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  background: var(--clr-bg);
  color: var(--clr-text-muted);
  font-family: var(--font);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.35rem 0.7rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn--header svg {
  width: 16px;
  height: 16px;
}

.btn--header:hover {
  background: var(--clr-surface);
  color: var(--clr-text);
  border-color: var(--clr-text-muted);
}

.btn--header.active {
  background: var(--clr-primary);
  color: #fff;
  border-color: var(--clr-primary);
}

/* ── Main layout ────────────────────────────────────────────────────── */
.main {
  flex: 1;
  display: flex;
  gap: 1rem;
  padding: 1rem;
  max-height: calc(100vh - 56px);
  overflow: hidden;
}

.panel {
  background: var(--clr-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel--canvas {
  flex: 1;
  min-width: 0;
}

.panel--sidebar {
  width: 300px;
  flex-shrink: 0;
  overflow-y: auto;
}

.panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--clr-border);
}

.panel__header h2 {
  font-size: 0.9rem;
  font-weight: 600;
}

.panel__actions {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.panel__actions-divider {
  width: 1px;
  height: 20px;
  background: var(--clr-border);
  margin: 0 0.15rem;
}

.btn--icon.btn--icon-label.active {
  background: var(--clr-primary);
  color: #fff;
}

/* ── Canvas wrapper ─────────────────────────────────────────────────── */
.canvas-wrapper {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: #1a1d23;
  display: flex;
  align-items: center;
  justify-content: center;
}

#annotation-canvas {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  cursor: crosshair;
}

/* ── Drop zone ──────────────────────────────────────────────────────── */
.drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 3rem;
  cursor: pointer;
  transition: var(--transition);
}

.drop-zone--hover {
  background: rgba(59, 130, 246, 0.08);
}

.drop-zone__icon {
  width: 56px;
  height: 56px;
  color: var(--clr-text-muted);
  opacity: 0.5;
}

.drop-zone__text {
  font-size: 1rem;
  font-weight: 500;
  color: var(--clr-text-muted);
}

.drop-zone__sub {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  opacity: 0.7;
}

/* ── Instructions bar ───────────────────────────────────────────────── */
.instructions-bar {
  padding: 0.45rem 1rem;
  background: rgba(59, 130, 246, 0.06);
  border-top: 1px solid var(--clr-border);
  font-size: 0.75rem;
  color: var(--clr-text-muted);
}

/* ── Sidebar sections ───────────────────────────────────────────────── */
.sidebar-section {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--clr-border);
}

.sidebar-section:last-child {
  border-bottom: none;
}

.sidebar-section__title {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--clr-text-muted);
  margin-bottom: 0.5rem;
}

/* ── Legend ──────────────────────────────────────────────────────────── */
.legend__item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0;
}

.legend__color {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  flex-shrink: 0;
}

.legend__label {
  flex: 1;
  font-size: 0.88rem;
}

.legend__count {
  font-size: 0.92rem;
  font-weight: 600;
  min-width: 24px;
  text-align: right;
}

.legend__divider {
  height: 1px;
  background: var(--clr-border);
  margin: 0.35rem 0;
}

/* ── Buttons ────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.55rem 1rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

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

.btn--primary {
  background: var(--clr-primary);
  color: #fff;
}
.btn--primary:hover:not(:disabled) {
  background: var(--clr-primary-hover);
}

.btn--accent {
  background: var(--clr-accent);
  color: #fff;
}
.btn--accent:hover:not(:disabled) {
  background: var(--clr-accent-hover);
}

.btn--success {
  background: var(--clr-success);
  color: #fff;
}
.btn--success:hover:not(:disabled) {
  background: var(--clr-success-hover);
}

.btn--roboflow {
  background: #6706ce;
  color: #fff;
}
.btn--roboflow:hover:not(:disabled) {
  background: #5505a8;
}

.btn--icon {
  width: 32px;
  height: 32px;
  padding: 0;
  background: transparent;
  color: var(--clr-text-muted);
  border-radius: var(--radius-sm);
}
.btn--icon:hover:not(:disabled) {
  background: var(--clr-bg);
  color: var(--clr-text);
}
.btn--icon svg {
  width: 16px;
  height: 16px;
}

/* ── Progress bar ───────────────────────────────────────────────────── */
.progress-container {
  margin-top: 0.5rem;
}

.progress-bar {
  height: 6px;
  background: var(--clr-bg);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--clr-accent), var(--clr-primary));
  border-radius: 3px;
  width: 0%;
  transition: width 0.4s ease;
}

.progress-text {
  display: block;
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  margin-top: 0.3rem;
}

/* ── Status log ─────────────────────────────────────────────────────── */
.status-log {
  max-height: 180px;
  overflow-y: auto;
  font-size: 0.78rem;
  color: var(--clr-text-muted);
}

.status-log__entry {
  padding: 0.2rem 0;
  border-bottom: 1px dotted var(--clr-border);
}

.status-log__entry:last-child {
  border-bottom: none;
}

/* ── Toast ──────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(120%);
  background: var(--clr-text);
  color: #fff;
  padding: 0.65rem 1.2rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: transform 0.35s ease, opacity 0.35s ease;
  z-index: 9999;
  white-space: nowrap;
}

.toast--visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast--success {
  background: var(--clr-success);
}

.toast--error {
  background: var(--clr-danger);
}

/* Dark-mode toast needs a lighter base so text is still readable */
[data-theme="dark"] .toast {
  background: #e4e7ec;
  color: #1a1d23;
}
[data-theme="dark"] .toast--success {
  background: var(--clr-success);
  color: #fff;
}
[data-theme="dark"] .toast--error {
  background: var(--clr-danger);
  color: #fff;
}

/* Dark-mode context menu fix — ensure text and class colours are visible */
[data-theme="dark"] .context-menu__item {
  color: var(--clr-text);
}
[data-theme="dark"] .context-menu__item .legend__color {
  border: 1px solid rgba(255, 255, 255, 0.3);
}
[data-theme="dark"] .context-menu__item:hover {
  background: var(--clr-border);
}

/* Draw-mode active state */
.btn--icon.btn--draw-active {
  background: var(--clr-primary);
  color: #fff;
  box-shadow: 0 0 0 2px var(--clr-primary);
}

/* ── Context menu ───────────────────────────────────────────────────── */
.context-menu {
  position: fixed;
  z-index: 1000;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 0.35rem;
  min-width: 170px;
}

.context-menu__item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  border: none;
  background: transparent;
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.82rem;
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
}

.context-menu__item:hover {
  background: var(--clr-bg);
}

.context-menu__item--danger:hover {
  background: rgba(239, 68, 68, 0.1);
  color: var(--clr-danger);
}

.context-menu__item--add-class {
  color: var(--clr-primary);
  font-weight: 500;
}
.context-menu__item--add-class:hover {
  background: rgba(79, 70, 229, 0.1);
}

.context-menu__divider {
  height: 1px;
  background: var(--clr-border);
  margin: 0.25rem 0;
}

.context-menu__item .legend__color {
  width: 12px;
  height: 12px;
}

/* ── Footer ──────────────────────────────────────────────────────────── */
.app-footer {
  background: var(--clr-surface);
  border-top: 1px solid var(--clr-border);
  padding: .6rem 1.2rem;
  text-align: center;
  font-size: .78rem;
  line-height: 1.5;
  color: var(--clr-text);
  flex-shrink: 0;
}

.footer__instructions {
  margin-bottom: .3rem;
  color: var(--clr-muted);
}

.footer__instructions strong {
  color: var(--clr-text);
  font-weight: 600;
}

.footer__disclaimer {
  color: #c5a038;
  font-size: .72rem;
}

[data-theme="dark"] .footer__disclaimer {
  color: #e2b93d;
}

/* ── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 860px) {
  .main {
    flex-direction: column;
    max-height: none;
    overflow: auto;
  }
  .panel--sidebar {
    width: 100%;
  }
  .panel--canvas {
    min-height: 55vh;
  }
}