/* ============================================================
   Medical Conference Management System - Main Styles
   ============================================================ */

:root {
  --primary: #1a56db;
  --primary-dark: #1342b8;
  --primary-light: #dbeafe;
  --secondary: #0e9f6e;
  --accent: #8b5cf6;
  --danger: #dc2626;
  --warning: #d97706;
  --info: #0891b2;
  --dark: #111827;
  --gray-900: #1f2937;
  --gray-700: #374151;
  --gray-500: #6b7280;
  --gray-300: #d1d5db;
  --gray-100: #f3f4f6;
  --white: #ffffff;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.1);
  --shadow: 0 4px 15px rgba(0,0,0,.1);
  --shadow-lg: 0 10px 30px rgba(0,0,0,.15);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all .25s ease;
}

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

body { font-family: 'Inter', sans-serif; color: var(--gray-900); background: var(--gray-100); line-height: 1.6; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ─── Navbar ─────────────────────────────────────────────────────────────── */
.navbar {
  background: var(--white);
  box-shadow: var(--shadow-sm);
  position: sticky; top: 0; z-index: 100;
  border-bottom: 3px solid var(--primary);
}
.nav-container {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px; gap: 20px;
}
.nav-brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-icon {
  width: 42px; height: 42px; border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex; align-items: center; justify-content: center;
  color: var(--white); font-size: 18px;
}
.brand-name { font-size: 18px; font-weight: 700; color: var(--primary); }
.brand-sub { font-size: 11px; color: var(--gray-500); }
.nav-menu { display: flex; align-items: center; gap: 8px; }
.nav-link {
  padding: 8px 14px; border-radius: var(--radius-sm);
  color: var(--gray-700); font-size: 14px; font-weight: 500;
  text-decoration: none; transition: var(--transition);
}
.nav-link:hover { background: var(--primary-light); color: var(--primary); }
.nav-dropdown { position: relative; }
.nav-user-btn {
  display: flex; align-items: center; gap: 8px;
  background: none; border: 1px solid var(--gray-300);
  padding: 7px 14px; border-radius: 30px; cursor: pointer;
  font-size: 14px; font-weight: 500; color: var(--gray-700);
  transition: var(--transition);
}
.nav-user-btn:hover { border-color: var(--primary); color: var(--primary); }
.dropdown-menu {
  position: absolute; right: 0; top: calc(100% + 8px);
  background: var(--white); border: 1px solid var(--gray-300);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  min-width: 200px; padding: 8px; display: none; z-index: 200;
}
.nav-dropdown:hover .dropdown-menu { display: block; }
.dropdown-menu a {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: var(--radius-sm);
  color: var(--gray-700); text-decoration: none; font-size: 14px;
  transition: var(--transition);
}
.dropdown-menu a:hover { background: var(--gray-100); }
.dropdown-menu a.text-danger { color: var(--danger); }
.dropdown-divider { border-top: 1px solid var(--gray-300); margin: 6px 0; }
.avatar-sm {
  width: 28px; height: 28px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white); font-size: 13px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.hamburger { display: none; background: none; border: none; font-size: 20px; cursor: pointer; }

/* ─── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; cursor: pointer;
  text-decoration: none; border: none; transition: var(--transition);
  white-space: nowrap;
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(26,86,219,.3); }
.btn-secondary { background: var(--gray-100); color: var(--gray-700); border: 1px solid var(--gray-300); }
.btn-secondary:hover { background: var(--gray-300); }
.btn-success { background: var(--secondary); color: var(--white); }
.btn-success:hover { background: #0c8a5e; }
.btn-danger { background: var(--danger); color: var(--white); }
.btn-danger:hover { background: #b91c1c; }
.btn-warning { background: var(--warning); color: var(--white); }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: var(--white); }
.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-block { width: 100%; justify-content: center; }

/* ─── Cards ───────────────────────────────────────────────────────────────── */
.card {
  background: var(--white); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 24px; margin-bottom: 20px;
}
.card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px; padding-bottom: 16px;
  border-bottom: 1px solid var(--gray-300);
}
.card-title { font-size: 18px; font-weight: 700; color: var(--dark); }

/* ─── Forms ───────────────────────────────────────────────────────────────── */
.form-group { margin-bottom: 18px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--gray-700); margin-bottom: 6px; }
.form-label .required { color: var(--danger); margin-left: 3px; }
.form-control {
  width: 100%; padding: 11px 14px; border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-sm); font-size: 14px; font-family: inherit;
  color: var(--gray-900); background: var(--white); transition: var(--transition);
}
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,86,219,.1); }
.form-control::placeholder { color: var(--gray-500); }
.form-hint { font-size: 12px; color: var(--gray-500); margin-top: 4px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
select.form-control { cursor: pointer; }
.form-check { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.form-check input[type="checkbox"], .form-check input[type="radio"] { width: 16px; height: 16px; cursor: pointer; }

/* ─── Badges ──────────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: 20px; font-size: 11px; font-weight: 600;
}
.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #cffafe; color: #164e63; }
.badge-primary { background: var(--primary-light); color: var(--primary-dark); }
.badge-secondary { background: var(--gray-100); color: var(--gray-700); }

/* ─── Tables ──────────────────────────────────────────────────────────────── */
.table-container { overflow-x: auto; border-radius: var(--radius-sm); }
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th {
  background: var(--gray-100); padding: 12px 16px;
  text-align: left; font-weight: 600; color: var(--gray-700);
  font-size: 12px; text-transform: uppercase; letter-spacing: .5px;
  border-bottom: 2px solid var(--gray-300);
}
.table td { padding: 12px 16px; border-bottom: 1px solid var(--gray-100); vertical-align: middle; }
.table tbody tr:hover { background: rgba(26,86,219,.03); }
.table tbody tr:last-child td { border-bottom: none; }

/* ─── Flash Messages ──────────────────────────────────────────────────────── */
.flash-container { position: fixed; top: 80px; right: 20px; z-index: 999; max-width: 420px; width: 100%; }
.flash {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 14px 16px; border-radius: var(--radius-sm);
  margin-bottom: 10px; box-shadow: var(--shadow-lg);
  animation: slideIn .3s ease;
}
@keyframes slideIn { from { transform: translateX(100%); opacity:0; } to { transform: translateX(0); opacity:1; } }
.flash-success { background: #ecfdf5; border-left: 4px solid var(--secondary); color: #065f46; }
.flash-error { background: #fef2f2; border-left: 4px solid var(--danger); color: #991b1b; }
.flash-warning { background: #fffbeb; border-left: 4px solid var(--warning); color: #92400e; }
.flash-info { background: #eff6ff; border-left: 4px solid var(--info); color: #164e63; }
.flash-close { margin-left: auto; background: none; border: none; cursor: pointer; font-size: 16px; opacity: .6; flex-shrink: 0; }

/* ─── Hero Section ────────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 50%, #0f172a 100%);
  position: relative; overflow: hidden; padding: 100px 0;
  color: var(--white);
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="40" fill="rgba(255,255,255,.03)"/><circle cx="80" cy="80" r="60" fill="rgba(255,255,255,.02)"/><circle cx="50" cy="50" r="30" fill="rgba(255,255,255,.04)"/></svg>');
}
.hero-content { position: relative; text-align: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2);
  padding: 6px 16px; border-radius: 30px; font-size: 13px; font-weight: 500;
  margin-bottom: 24px; backdrop-filter: blur(10px);
}
.hero-title { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.15; margin-bottom: 20px; }
.hero-title span { color: #60a5fa; }
.hero-desc { font-size: 18px; color: rgba(255,255,255,.8); max-width: 600px; margin: 0 auto 36px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 40px; justify-content: center; margin-top: 60px; }
.hero-stat .number { font-size: 32px; font-weight: 800; color: #60a5fa; }
.hero-stat .label { font-size: 13px; color: rgba(255,255,255,.7); }

/* ─── Conference Cards ────────────────────────────────────────────────────── */
.section { padding: 70px 0; }
.section-title { font-size: 2rem; font-weight: 800; text-align: center; margin-bottom: 12px; }
.section-sub { text-align: center; color: var(--gray-500); margin-bottom: 50px; font-size: 16px; }
.conferences-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 24px; }
.conf-card {
  background: var(--white); border-radius: var(--radius);
  box-shadow: var(--shadow); overflow: hidden;
  transition: var(--transition); border: 1px solid var(--gray-300);
}
.conf-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.conf-card-banner {
  height: 180px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  position: relative; display: flex; align-items: center; justify-content: center;
}
.conf-card-banner img { width: 100%; height: 100%; object-fit: cover; }
.conf-card-banner .conf-date-badge {
  position: absolute; top: 16px; left: 16px;
  background: rgba(255,255,255,.95); border-radius: 8px;
  padding: 8px 14px; font-size: 12px; font-weight: 700; color: var(--primary);
  box-shadow: var(--shadow-sm);
}
.conf-card-body { padding: 20px; }
.conf-card-title { font-size: 17px; font-weight: 700; margin-bottom: 8px; color: var(--dark); }
.conf-card-meta { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.conf-meta-item { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--gray-500); }
.conf-meta-item i { width: 16px; color: var(--primary); }
.conf-card-footer { display: flex; align-items: center; justify-content: space-between; padding-top: 16px; border-top: 1px solid var(--gray-100); }
.conf-price { font-size: 13px; color: var(--gray-500); }
.conf-price strong { font-size: 20px; color: var(--primary); }

/* ─── Page Header ─────────────────────────────────────────────────────────── */
.page-header {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white); padding: 40px 0;
}
.page-header h1 { font-size: 28px; font-weight: 800; margin-bottom: 6px; }
.page-header p { opacity: .85; }

/* ─── Step Indicator ──────────────────────────────────────────────────────── */
.steps { display: flex; align-items: center; justify-content: center; gap: 0; margin: 30px 0; }
.step {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 20px; background: var(--gray-100);
  border-radius: 30px; font-size: 13px; font-weight: 600; color: var(--gray-500);
}
.step.active { background: var(--primary-light); color: var(--primary); }
.step.done { background: #d1fae5; color: #065f46; }
.step-num {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--gray-300); color: var(--white);
  display: flex; align-items: center; justify-content: center; font-size: 12px;
}
.step.active .step-num { background: var(--primary); }
.step.done .step-num { background: var(--secondary); }
.step-sep { flex: 1; height: 2px; background: var(--gray-300); min-width: 30px; }

/* ─── Fee Display ─────────────────────────────────────────────────────────── */
.fee-summary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white); border-radius: var(--radius); padding: 24px;
}
.fee-row { display: flex; justify-content: space-between; padding: 8px 0; font-size: 14px; }
.fee-total { border-top: 2px solid rgba(255,255,255,.3); margin-top: 10px; padding-top: 12px; font-size: 20px; font-weight: 800; }
.fee-discount { color: #86efac; }

/* ─── Workshop Cards ──────────────────────────────────────────────────────── */
.workshop-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.workshop-card {
  border: 2px solid var(--gray-300); border-radius: var(--radius-sm);
  padding: 16px; cursor: pointer; transition: var(--transition); background: var(--white);
}
.workshop-card:hover { border-color: var(--primary); }
.workshop-card.selected { border-color: var(--primary); background: var(--primary-light); }
.workshop-card.full { opacity: .6; cursor: not-allowed; border-color: var(--gray-300); }
.workshop-title { font-weight: 700; font-size: 15px; margin-bottom: 8px; }
.workshop-meta { font-size: 12px; color: var(--gray-500); }
.workshop-meta span { display: inline-flex; align-items: center; gap: 4px; margin-right: 12px; }
.workshop-fee { font-size: 16px; font-weight: 700; color: var(--primary); margin-top: 10px; }
.workshop-seats { font-size: 11px; }
.seats-available { color: var(--secondary); }
.seats-few { color: var(--warning); }
.seats-full { color: var(--danger); }

/* ─── Dashboard Stats ─────────────────────────────────────────────────────── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 28px; }
.stat-card {
  background: var(--white); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow);
  display: flex; align-items: center; gap: 16px;
  border-left: 4px solid var(--primary); transition: var(--transition);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.stat-icon {
  width: 52px; height: 52px; border-radius: var(--radius-sm);
  background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center; font-size: 22px;
  flex-shrink: 0;
}
.stat-card.green { border-color: var(--secondary); }
.stat-card.green .stat-icon { background: #d1fae5; color: var(--secondary); }
.stat-card.purple { border-color: var(--accent); }
.stat-card.purple .stat-icon { background: #ede9fe; color: var(--accent); }
.stat-card.orange { border-color: var(--warning); }
.stat-card.orange .stat-icon { background: #fef3c7; color: var(--warning); }
.stat-value { font-size: 26px; font-weight: 800; color: var(--dark); }
.stat-label { font-size: 12px; color: var(--gray-500); font-weight: 500; }

/* ─── Footer ──────────────────────────────────────────────────────────────── */
.footer { background: var(--dark); color: rgba(255,255,255,.8); padding: 60px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; margin-bottom: 40px; }
.footer-brand { font-size: 22px; font-weight: 800; color: var(--white); margin-bottom: 12px; }
.footer-desc { font-size: 14px; color: rgba(255,255,255,.6); line-height: 1.7; }
.footer-title { font-size: 14px; font-weight: 700; color: var(--white); text-transform: uppercase; letter-spacing: .8px; margin-bottom: 16px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { color: rgba(255,255,255,.6); text-decoration: none; font-size: 14px; transition: var(--transition); }
.footer-links a:hover { color: #60a5fa; }
.footer p { font-size: 13px; margin-bottom: 6px; display: flex; align-items: center; gap: 8px; color: rgba(255,255,255,.6); }
.social-links { display: flex; gap: 12px; margin-top: 16px; }
.social-links a {
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(255,255,255,.1); color: rgba(255,255,255,.8);
  display: flex; align-items: center; justify-content: center;
  text-decoration: none; transition: var(--transition);
}
.social-links a:hover { background: var(--primary); color: var(--white); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding-top: 20px; text-align: center; font-size: 13px; color: rgba(255,255,255,.5); }

/* ─── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-menu { display: none; flex-direction: column; position: absolute; top: 70px; left: 0; right: 0; background: var(--white); padding: 16px; box-shadow: var(--shadow-lg); border-top: 1px solid var(--gray-300); }
  .nav-menu.open { display: flex; }
  .hamburger { display: block; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .conferences-grid { grid-template-columns: 1fr; }
  .form-row, .form-row-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
}