/* ============================================================
   MathApex — Global Design System
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* === TOKENS === */
:root {
  --bg:          #f8fafc;
  --bg2:         #f1f5f9;
  --bg3:         #ffffff;
  --surface:     #ffffff;
  --surface-h:   #f8fafc;
  --border:      #e2e8f0;
  --border-h:    #cbd5e1;

  --accent:      #4f46e5;
  --accent-h:    #4338ca;
  --accent-glow: rgba(79, 70, 229, 0.15);
  --cyan:        #0284c7;
  --cyan-glow:   rgba(2, 132, 199, 0.15);

  --text:        #0f172a;
  --text-2:      #334155;
  --text-3:      #64748b;

  --success:     #10b981;
  --danger:      #ef4444;
  --warning:     #f59e0b;
  --info:        #3b82f6;

  --radius-s:  6px;
  --radius:    10px;
  --radius-l:  16px;
  --radius-xl: 24px;

  --shadow:    0 4px 24px rgba(0,0,0,0.4);
  --shadow-l:  0 8px 48px rgba(0,0,0,0.5);
  --trans:     0.2s ease;

  --inst-primary:   #6366f1;
  --inst-secondary: #22d3ee;
}

/* === RESET === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: color var(--trans); }
a:hover { color: var(--accent-h); }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; }

/* === SCROLLBAR === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border-h); border-radius: 99px; }

/* === TYPOGRAPHY === */
h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.1; }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 700; line-height: 1.2; }
h3 { font-size: 1.25rem; font-weight: 600; }
h4 { font-size: 1rem; font-weight: 600; }
p  { color: var(--text-2); }
.gradient-text {
  background: linear-gradient(135deg, var(--accent), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* === LAYOUT === */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.container-sm { max-width: 700px; margin: 0 auto; padding: 0 1.5rem; }
.section { padding: 5rem 0; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 1.25rem; }
@media(max-width:900px) { .grid-3,.grid-4 { grid-template-columns: repeat(2,1fr); } }
@media(max-width:600px) { .grid-2,.grid-3,.grid-4 { grid-template-columns: 1fr; } }

/* === NAVBAR === */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  height: 64px;
}
.nav-container {
  max-width: 1200px; margin: 0 auto; padding: 0 1.5rem;
  height: 100%; display: flex; align-items: center; gap: 2rem;
}
.nav-logo {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 1.3rem; font-weight: 800; color: var(--text); text-decoration: none;
}
.logo-icon { color: var(--accent); font-size: 1.6rem; display: flex; }
.logo-text .accent { color: var(--accent); }
.nav-links {
  display: flex; align-items: center; gap: 0.25rem; margin-left: auto;
}
.nav-links a {
  display: flex; align-items: center; gap: 0.4rem;
  padding: 0.5rem 0.85rem; border-radius: var(--radius-s);
  font-size: 0.9rem; font-weight: 500; color: var(--text-2);
  transition: all var(--trans);
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text); background: var(--surface-h);
}
.nav-actions { display: flex; align-items: center; gap: 0.75rem; margin-left: auto; }
.nav-user { position: relative; margin-left: auto; }
.user-btn {
  display: flex; align-items: center; gap: 0.5rem;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 0.4rem 0.75rem;
  color: var(--text); font-size: 0.875rem; font-weight: 500;
  transition: all var(--trans);
}
.user-btn:hover { background: var(--surface-h); border-color: var(--border-h); }
.avatar-sm {
  width: 28px; height: 28px; border-radius: 50%; object-fit: cover;
}
.avatar-initials {
  background: linear-gradient(135deg, var(--accent), var(--cyan));
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 700; color: #fff;
}
.user-dropdown {
  position: absolute; right: 0; top: calc(100% + 8px);
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--radius-l); min-width: 200px;
  box-shadow: var(--shadow-l); padding: 0.5rem;
  animation: fadeDown 0.15s ease;
}
.dropdown-header { padding: 0.5rem 0.75rem 0.75rem; }
.dropdown-name { font-weight: 600; font-size: 0.9rem; color: var(--text); }
.dropdown-role { font-size: 0.75rem; color: var(--text-3); text-transform: capitalize; }
.dropdown-divider { border: none; border-top: 1px solid var(--border); margin: 0.25rem 0; }
.dropdown-item {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.6rem 0.75rem; border-radius: var(--radius-s);
  font-size: 0.875rem; color: var(--text-2);
  transition: all var(--trans);
}
.dropdown-item:hover { background: var(--surface-h); color: var(--text); }
.dropdown-item-danger:hover { background: rgba(239,68,68,0.1); color: var(--danger); }
.nav-hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; padding: 0.5rem; margin-left: auto;
}
.nav-hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--text-2); border-radius: 2px;
  transition: all var(--trans);
}
@media(max-width:768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-actions { display: none; }
}

/* === BUTTONS === */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.65rem 1.4rem; border-radius: var(--radius);
  font-size: 0.9rem; font-weight: 600; border: none;
  transition: all var(--trans); cursor: pointer; text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-h));
  color: #fff; box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover {
  transform: translateY(-1px); box-shadow: 0 6px 28px var(--accent-glow);
  color: #fff;
}
.btn-secondary {
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--surface-h); border-color: var(--border-h); color: var(--text); }
.btn-ghost {
  background: transparent; color: var(--text-2); border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--surface); color: var(--text); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; transform: translateY(-1px); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-sm { padding: 0.45rem 1rem; font-size: 0.825rem; }
.btn-lg { padding: 0.85rem 2rem; font-size: 1rem; }
.btn-full { width: 100%; justify-content: center; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* === CARDS === */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-l);
  padding: 1.5rem;
  transition: all var(--trans);
}
.card:hover { border-color: var(--border-h); transform: translateY(-2px); box-shadow: var(--shadow); }
.card-glass {
  background: rgba(255,255,255,0.03);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius-l);
  padding: 1.5rem;
}
.stat-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-l); padding: 1.5rem;
  display: flex; flex-direction: column; gap: 0.5rem;
  transition: all var(--trans);
}
.stat-card:hover { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent-glow); }
.stat-card .stat-icon {
  width: 44px; height: 44px; border-radius: var(--radius);
  background: var(--accent-glow); display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; color: var(--accent); margin-bottom: 0.25rem;
}
.stat-card .stat-value { font-size: 2rem; font-weight: 800; color: var(--text); line-height: 1; }
.stat-card .stat-label { font-size: 0.825rem; color: var(--text-3); font-weight: 500; }

/* === FORMS === */
.form-group { display: flex; flex-direction: column; gap: 0.4rem; margin-bottom: 1.25rem; }
.form-label { font-size: 0.875rem; font-weight: 600; color: var(--text-2); }
.form-label .required { color: var(--danger); margin-left: 2px; }
.form-control {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 0.7rem 1rem;
  color: var(--text); font-family: inherit; font-size: 0.9rem;
  transition: all var(--trans); width: 100%;
}
.form-control:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-control::placeholder { color: var(--text-3); }
select.form-control { cursor: pointer; }
textarea.form-control { resize: vertical; min-height: 100px; }
.form-hint { font-size: 0.775rem; color: var(--text-3); }
.form-error { font-size: 0.775rem; color: var(--danger); }
input[type="radio"], input[type="checkbox"] {
  width: 1.15rem; height: 1.15rem; margin: 0;
  accent-color: var(--accent); cursor: pointer;
  flex-shrink: 0;
}

/* === ALERTS === */
.alert {
  display: flex; align-items: flex-start; gap: 0.75rem;
  padding: 0.9rem 1rem; border-radius: var(--radius);
  margin-bottom: 1rem; font-size: 0.875rem; font-weight: 500;
  border: 1px solid transparent; position: relative;
}
.alert i { font-size: 1.1rem; flex-shrink: 0; margin-top: 1px; }
.alert span { flex: 1; }
.alert-close {
  background: none; border: none; color: inherit; opacity: 0.6;
  padding: 0; cursor: pointer; margin-left: auto; flex-shrink: 0;
}
.alert-success { background: rgba(16,185,129,0.1); border-color: rgba(16,185,129,0.2); color: #6ee7b7; }
.alert-error   { background: rgba(239,68,68,0.1);  border-color: rgba(239,68,68,0.2);  color: #fca5a5; }
.alert-warning { background: rgba(245,158,11,0.1); border-color: rgba(245,158,11,0.2); color: #fcd34d; }
.alert-info    { background: rgba(59,130,246,0.1); border-color: rgba(59,130,246,0.2); color: #93c5fd; }

/* === BADGES === */
.badge {
  display: inline-flex; align-items: center; gap: 0.3rem;
  padding: 0.2rem 0.6rem; border-radius: 99px;
  font-size: 0.725rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em;
}
.badge-success { background: rgba(16,185,129,0.15); color: #6ee7b7; }
.badge-danger  { background: rgba(239,68,68,0.15);  color: #fca5a5; }
.badge-warning { background: rgba(245,158,11,0.15); color: #fcd34d; }
.badge-info    { background: rgba(59,130,246,0.15); color: #93c5fd; }
.badge-accent  { background: var(--accent-glow);    color: var(--accent-h); }
.badge-muted   { background: var(--surface-h);       color: var(--text-3); }

/* === TABLE === */
.table-wrap { overflow-x: auto; border-radius: var(--radius-l); border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
thead th {
  background: var(--surface); padding: 0.85rem 1rem;
  text-align: left; font-weight: 600; color: var(--text-2);
  font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
}
tbody td { padding: 0.85rem 1rem; border-bottom: 1px solid var(--border); color: var(--text-2); }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--surface); color: var(--text); }

/* === PAGE HEADER === */
.page-hero {
  padding: 5.5rem 0 2.5rem;
  background: linear-gradient(180deg, var(--bg2) 0%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: 2rem; margin-bottom: 0.5rem; }
.breadcrumb { display: flex; align-items: center; gap: 0.5rem; font-size: 0.825rem; color: var(--text-3); }
.breadcrumb a { color: var(--text-3); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb-sep { color: var(--text-3); }

/* === SIDEBAR LAYOUT === */
.app-layout { display: flex; min-height: 100vh; padding-top: 64px; }
.sidebar {
  width: 240px; flex-shrink: 0;
  background: var(--bg2); border-right: 1px solid var(--border);
  position: fixed; top: 64px; bottom: 0; overflow-y: auto;
  padding: 1.5rem 0.75rem;
}
.sidebar-section { margin-bottom: 1.5rem; }
.sidebar-label { font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--text-3); padding: 0 0.75rem; margin-bottom: 0.5rem; }
.sidebar-link {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.6rem 0.75rem; border-radius: var(--radius-s);
  font-size: 0.875rem; font-weight: 500; color: var(--text-2);
  transition: all var(--trans); margin-bottom: 1px;
}
.sidebar-link:hover, .sidebar-link.active {
  background: var(--surface-h); color: var(--text);
}
.sidebar-link.active { color: var(--accent); background: var(--accent-glow); }
.sidebar-link i { font-size: 1.1rem; width: 20px; }
.main-content { flex: 1; margin-left: 240px; padding: 2rem; }
@media(max-width:900px) {
  .sidebar { transform: translateX(-100%); z-index: 999; transition: transform var(--trans); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
}

/* === PROGRESS & STAGE === */
.stage-track { display: flex; align-items: center; gap: 0; margin: 1rem 0; }
.stage-step {
  display: flex; flex-direction: column; align-items: center; flex: 1;
}
.stage-dot {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--surface); border: 2px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 700; color: var(--text-3);
  position: relative; z-index: 1;
}
.stage-dot.done    { background: var(--success); border-color: var(--success); color: #fff; }
.stage-dot.active  { background: var(--accent);  border-color: var(--accent);  color: #fff;
                     box-shadow: 0 0 0 4px var(--accent-glow); }
.stage-label { font-size: 0.7rem; font-weight: 600; color: var(--text-3); margin-top: 0.4rem; text-align: center; }
.stage-connector { flex: 1; height: 2px; background: var(--border); margin-top: -18px; }
.stage-connector.done { background: var(--success); }
.progress-bar { background: var(--surface); border-radius: 99px; height: 8px; overflow: hidden; }
.progress-fill {
  height: 100%; border-radius: 99px;
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  transition: width 0.6s ease;
}

/* === AUTH PAGES === */
.auth-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 2rem 1rem;
  background: radial-gradient(ellipse at 30% 20%, rgba(99,102,241,0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 80%, rgba(34,211,238,0.06) 0%, transparent 60%), var(--bg);
}
.auth-card {
  width: 100%; max-width: 460px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-xl); padding: 2.5rem;
  box-shadow: var(--shadow-l);
}
.auth-logo { text-align: center; margin-bottom: 2rem; }
.auth-logo .logo-icon { font-size: 2.5rem; color: var(--accent); margin-bottom: 0.5rem; justify-content: center; }
.auth-logo h1 { font-size: 1.75rem; }
.auth-divider {
  display: flex; align-items: center; gap: 1rem;
  font-size: 0.8rem; color: var(--text-3); margin: 1.25rem 0;
}
.auth-divider::before, .auth-divider::after {
  content: ''; flex: 1; height: 1px; background: var(--border);
}
.auth-footer { text-align: center; font-size: 0.85rem; color: var(--text-3); margin-top: 1.25rem; }
.auth-footer a { color: var(--accent); font-weight: 500; }

/* === ANIMATIONS === */
@keyframes fadeIn   { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse    { 0%,100% { opacity: 1; } 50% { opacity: 0.5; } }
@keyframes spin     { to { transform: rotate(360deg); } }
@keyframes float    { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
@keyframes glow     { 0%,100% { box-shadow: 0 0 20px var(--accent-glow); } 50% { box-shadow: 0 0 40px var(--accent-glow); } }

.animate-in  { animation: fadeIn 0.4s ease forwards; }
.animate-float { animation: float 4s ease-in-out infinite; }

/* === MISC === */
.text-center { text-align: center; }
.text-right  { text-align: right; }
.text-muted  { color: var(--text-3); }
.text-accent { color: var(--accent); }
.text-success{ color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning{ color: var(--warning); }
.mt-1 { margin-top: 0.5rem; }  .mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; } .mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; } .mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; } .mb-4 { margin-bottom: 2rem; }
.gap-1 { gap: 0.5rem; } .gap-2 { gap: 1rem; }
.hidden { display: none !important; }
.loading-spinner {
  width: 20px; height: 20px; border: 2px solid var(--border);
  border-top-color: var(--accent); border-radius: 50%;
  animation: spin 0.7s linear infinite; display: inline-block;
}
.divider { border: none; border-top: 1px solid var(--border); margin: 1.5rem 0; }
.chip {
  display: inline-flex; align-items: center; gap: 0.3rem;
  padding: 0.3rem 0.75rem; border-radius: 99px;
  background: var(--surface); border: 1px solid var(--border);
  font-size: 0.8rem; font-weight: 500; color: var(--text-2);
}
.empty-state {
  text-align: center; padding: 3rem 1rem; color: var(--text-3);
}
.empty-state i { font-size: 3rem; margin-bottom: 1rem; display: block; opacity: 0.4; }
.empty-state h3 { color: var(--text-2); margin-bottom: 0.5rem; }