/* ─────────────────────────────────────────────────────────────────
   style.css — TP Filtrage Adaptatif
   Design sombre, glassmorphism, couleurs harmonieuses
   ───────────────────────────────────────────────────────────────── */

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

:root {
  --bg:          #0b0f1a;
  --bg-2:        #111827;
  --bg-3:        #1a2235;
  --surface:     rgba(255,255,255,0.04);
  --surface-2:   rgba(255,255,255,0.08);
  --border:      rgba(255,255,255,0.1);
  --border-2:    rgba(255,255,255,0.16);

  --text:        #f0f4ff;
  --text-2:      #a0aec0;
  --text-3:      #6b7a99;

  /* Couleurs des algorithmes */
  --lms:         #38bdf8;
  --lms-glow:    rgba(56,189,248,0.25);
  --rls:         #a78bfa;
  --rls-glow:    rgba(167,139,250,0.25);
  --kalman:      #34d399;
  --kalman-glow: rgba(52,211,153,0.25);

  /* Gradient principal */
  --grad:        linear-gradient(135deg, #38bdf8, #818cf8, #a78bfa);

  --radius:      12px;
  --radius-lg:   20px;
  --shadow:      0 4px 24px rgba(0,0,0,0.5);
  --transition:  0.22s cubic-bezier(0.4,0,0.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Navbar ─────────────────────────────────────────────────────── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 60px;
  background: rgba(11,15,26,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav-logo {
  font-size: 1.6rem;
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.nav-subtitle {
  font-size: 0.72rem;
  color: var(--text-3);
  border-left: 1px solid var(--border);
  padding-left: 10px;
  margin-left: 4px;
}

.nav-links {
  display: flex;
  gap: 4px;
}

.nav-link {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-2);
  text-decoration: none;
  transition: var(--transition);
}

.nav-link:hover  { color: var(--text); background: var(--surface-2); }
.nav-link.active { color: var(--text); background: var(--surface-2); }

/* ── Hero page ──────────────────────────────────────────────────── */
.hero-page { min-height: calc(100vh - 60px); }

.hero {
  position: relative;
  padding: 7rem 2rem 5rem;
  text-align: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  animation: float 8s ease-in-out infinite;
}
.hero-orb-1 { width: 400px; height: 400px; background: #38bdf820; top:-80px; left: 10%; animation-delay:0s; }
.hero-orb-2 { width: 350px; height: 350px; background: #a78bfa20; top:100px; right: 8%; animation-delay:3s; }
.hero-orb-3 { width: 300px; height: 300px; background: #34d39920; bottom:-40px; left: 40%; animation-delay:5s; }

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-24px); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 780px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 5px 16px;
  border-radius: 100px;
  background: rgba(56,189,248,0.12);
  border: 1px solid rgba(56,189,248,0.3);
  color: var(--lms);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 1.2rem;
  text-transform: uppercase;
}

.hero-title {
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.gradient-text {
  background: var(--grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-2);
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ── Buttons ────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  color: #0b0f1a;
  box-shadow: 0 4px 20px rgba(56,189,248,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(56,189,248,0.45); }

.btn-secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border-2);
}
.btn-secondary:hover { background: var(--surface); transform: translateY(-2px); }

/* ── Section titles ─────────────────────────────────────────────── */
.section-title {
  text-align: center;
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
}

/* ── Algo cards (home page) ─────────────────────────────────────── */
.cards-section {
  padding: 4rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.algo-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  transition: var(--transition);
}
.algo-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  box-shadow: var(--shadow);
}

.algo-card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.lms-icon    { background: rgba(56,189,248,0.15); color: var(--lms); border: 1px solid rgba(56,189,248,0.3); }
.rls-icon    { background: rgba(167,139,250,0.15); color: var(--rls); border: 1px solid rgba(167,139,250,0.3); }
.kalman-icon { background: rgba(52,211,153,0.15); color: var(--kalman); border: 1px solid rgba(52,211,153,0.3); }

.algo-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.algo-card p {
  font-size: 0.875rem;
  color: var(--text-2);
  margin-bottom: 1rem;
}

.algo-equations {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 1rem;
  padding: 10px 12px;
  background: rgba(0,0,0,0.3);
  border-radius: 8px;
  border-left: 3px solid var(--border-2);
}

.algo-equations code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-2);
}

.algo-meta { display: flex; gap: 8px; flex-wrap: wrap; }

.tag {
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--surface-2);
  color: var(--text-3);
  border: 1px solid var(--border);
}

/* ── Problem cards ──────────────────────────────────────────────── */
.problems-section {
  padding: 2rem 2rem 4rem;
  max-width: 1200px;
  margin: 0 auto;
}

.problems-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.problem-card {
  display: flex;
  gap: 1.2rem;
  padding: 1.8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
  align-items: flex-start;
}
.problem-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-2);
  box-shadow: var(--shadow);
}

.problem-icon  { font-size: 2rem; flex-shrink: 0; margin-top: 2px; }

.problem-content h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.5rem; }
.problem-content p  { font-size: 0.85rem; color: var(--text-2); margin-bottom: 0.7rem; }
.problem-content ul { font-size: 0.82rem; color: var(--text-3); padding-left: 1.2rem; }
.problem-content li { margin-bottom: 2px; }

.problem-arrow {
  align-self: center;
  margin-left: auto;
  font-size: 1.2rem;
  color: var(--text-3);
  transition: var(--transition);
}
.problem-card:hover .problem-arrow { transform: translateX(4px); color: var(--lms); }

/* ── Simulation pages ───────────────────────────────────────────── */
.sim-page {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.page-header {
  padding: 3rem 0 2rem;
  text-align: center;
}

.page-header-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 100px;
  background: rgba(56,189,248,0.1);
  border: 1px solid rgba(56,189,248,0.25);
  color: var(--lms);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.9rem;
}

.page-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.7rem;
}

.page-header p {
  font-size: 0.9rem;
  color: var(--text-2);
}

/* ── Global params section ──────────────────────────────────────── */
.params-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.section-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}

.params-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

/* ── Form elements ──────────────────────────────────────────────── */
.param-field {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.param-field label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-2);
  letter-spacing: 0.02em;
}

.param-field small {
  font-size: 0.72rem;
  color: var(--text-3);
}

.param-field input[type="number"],
.param-field input[type="text"] {
  background: rgba(0,0,0,0.35);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88rem;
  transition: var(--transition);
  outline: none;
}

.param-field input:focus {
  border-color: var(--lms);
  box-shadow: 0 0 0 3px rgba(56,189,248,0.15);
}

/* ── Tabs ───────────────────────────────────────────────────────── */
.algo-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 8px 20px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.tab-btn:hover { color: var(--text); background: var(--surface-2); }
.tab-btn.active {
  background: rgba(56,189,248,0.12);
  color: var(--lms);
  border-color: rgba(56,189,248,0.35);
}

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

/* ── Panel layout ───────────────────────────────────────────────── */
.panel-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 900px) {
  .panel-layout { grid-template-columns: 1fr; }
}

.panel-params {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel-title {
  font-size: 1rem;
  font-weight: 600;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--border);
}

.lms-color    { color: var(--lms); }
.rls-color    { color: var(--rls); }
.kalman-color { color: var(--kalman); }

.run-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 11px 16px;
  border-radius: 10px;
  border: none;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  margin-top: 4px;
}

.lms-btn    { background: rgba(56,189,248,0.15); color: var(--lms); border: 1px solid rgba(56,189,248,0.35); }
.rls-btn    { background: rgba(167,139,250,0.15); color: var(--rls); border: 1px solid rgba(167,139,250,0.35); }
.kalman-btn { background: rgba(52,211,153,0.15); color: var(--kalman); border: 1px solid rgba(52,211,153,0.35); }
.compare-btn { background: rgba(251,191,36,0.1); color: #fbbf24; border: 1px solid rgba(251,191,36,0.3); }

.lms-btn:hover    { background: rgba(56,189,248,0.28); transform: translateY(-1px); }
.rls-btn:hover    { background: rgba(167,139,250,0.28); transform: translateY(-1px); }
.kalman-btn:hover { background: rgba(52,211,153,0.28); transform: translateY(-1px); }
.compare-btn:hover { background: rgba(251,191,36,0.2); transform: translateY(-1px); }

.run-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-icon { font-size: 0.85rem; }

.algo-info {
  background: rgba(0,0,0,0.25);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-2);
}

.algo-info h4 {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.algo-info p, .algo-info li { margin-bottom: 0.3rem; }
.algo-info ul { padding-left: 1rem; }

.info-text { font-size: 0.83rem; color: var(--text-2); }

/* ── Results panel ──────────────────────────────────────────────── */
.panel-results {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.placeholder-msg {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-3);
  font-size: 0.9rem;
  text-align: center;
  padding: 3rem;
  border: 2px dashed var(--border);
  border-radius: 12px;
}

.result-plot {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  display: block;
}

/* ── Stats table ────────────────────────────────────────────────── */
.stats-table h4 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: 0.6rem;
}

.stats-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.stats-table th {
  text-align: left;
  padding: 8px 12px;
  background: rgba(0,0,0,0.3);
  color: var(--text-3);
  font-weight: 600;
  font-size: 0.78rem;
  border-bottom: 1px solid var(--border);
}

.stats-table td {
  padding: 7px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  font-family: 'JetBrains Mono', monospace;
}

.stats-table tr:hover td { background: var(--surface-2); }

/* ── Loading spinner ────────────────────────────────────────────── */
.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 3rem;
  color: var(--text-2);
}

.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border-2);
  border-top-color: var(--lms);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Error box ──────────────────────────────────────────────────── */
.error-box {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  color: #fca5a5;
  font-size: 0.85rem;
}

.error-box strong { display: block; margin-bottom: 0.4rem; }

/* ── Code page ──────────────────────────────────────────────────── */
.code-page {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.code-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 900px) {
  .code-layout { grid-template-columns: 1fr; }
}

.code-sidebar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.2rem;
  position: sticky;
  top: 76px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sidebar-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin-bottom: 0.2rem;
}

.module-group { display: flex; flex-direction: column; gap: 4px; }

.module-group-title {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 8px;
}

.module-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  text-align: left;
  transition: var(--transition);
  width: 100%;
}

.module-btn:hover { background: var(--surface-2); color: var(--text); }
.module-btn.active {
  background: rgba(56,189,248,0.1);
  color: var(--text);
  border-color: rgba(56,189,248,0.25);
}

.module-icon { font-size: 1.1rem; flex-shrink: 0; }

.module-info { display: flex; flex-direction: column; }
.module-info strong { font-size: 0.82rem; font-weight: 600; }
.module-info small  { font-size: 0.7rem; color: var(--text-3); }
.module-btn.active .module-info small { color: var(--text-2); }

.structure-info {
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}

.structure-info h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin-bottom: 0.6rem;
  font-weight: 600;
}

.file-tree {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  color: var(--text-3);
  white-space: pre-wrap;
  line-height: 1.7;
}

/* Code viewer area */
.code-viewer-area {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.code-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: rgba(0,0,0,0.3);
  border-bottom: 1px solid var(--border);
}

.code-filename {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: var(--text-2);
}

.copy-btn {
  padding: 5px 14px;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-2);
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition);
}

.copy-btn:hover { background: var(--surface); color: var(--text); }

.code-container {
  max-height: 75vh;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-2) transparent;
}

.code-container pre {
  margin: 0;
  padding: 1.5rem;
}

.code-container code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  line-height: 1.7;
}

/* Override highlight.js background */
.hljs { background: transparent !important; }

/* ── Footer ─────────────────────────────────────────────────────── */
.footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--border);
  color: var(--text-3);
  font-size: 0.8rem;
  margin-top: 4rem;
}

/* ── Scrollbar ──────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }