/* =====================================================
   BD-China Space Share  |  Version 1.0.0
   Modern Light UI with Soft Gradients
   Font: Hind Siliguri + Noto Sans Bengali
===================================================== */

@import url('https://fonts.googleapis.com/css2?family=Hind+Siliguri:wght@300;400;500;600;700&family=Noto+Sans+Bengali:wght@400;500;600;700&display=swap');

:root {
  --primary: #0d9488;
  --primary-dark: #0f766e;
  --primary-light: #14b8a6;
  --accent: #f59e0b;
  --accent-dark: #d97706;
  --secondary: #3b82f6;
  --dark: #0f172a;
  --gray-900: #1e293b;
  --gray-700: #334155;
  --gray-600: #475569;
  --gray-500: #64748b;
  --gray-400: #94a3b8;
  --gray-200: #e2e8f0;
  --gray-100: #f1f5f9;
  --gray-50: #f8fafc;
  --white: #ffffff;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 4px 20px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 40px rgba(15, 23, 42, 0.12);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Hind Siliguri', 'Noto Sans Bengali', sans-serif;
  background: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul { list-style: none; }

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 4px 15px rgba(13, 148, 136, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(13, 148, 136, 0.45);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: white;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.35);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(245, 158, 11, 0.45);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: white;
}

.btn-white {
  background: white;
  color: var(--primary-dark);
  box-shadow: var(--shadow);
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 17px;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 13px;
}

/* ========== NAVBAR ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 22px;
  color: var(--primary-dark);
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 20px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 500;
  color: var(--gray-700);
  font-size: 15px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background: rgba(13, 148, 136, 0.08);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--gray-700);
}

/* ========== HERO CAROUSEL ========== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 620px;
  margin-top: 72px;
  overflow: hidden;
}

.hero-slides {
  position: absolute;
  inset: 0;
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1.2s ease;
  background-size: cover;
  background-position: center;
}

.hero-slide.active {
  opacity: 1;
}

.hero-slide::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.72) 0%, rgba(13, 148, 136, 0.55) 100%);
}

.hero-content {
  position: relative;
  z-index: 10;
  height: 100%;
  display: flex;
  align-items: center;
  color: white;
}

.hero-text {
  max-width: 720px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(8px);
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 24px;
  border: 1px solid rgba(255,255,255,0.25);
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 18px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.2);
}

.hero h1 span {
  color: #fcd34d;
}

.hero-sub {
  font-size: 1.15rem;
  opacity: 0.95;
  margin-bottom: 32px;
  line-height: 1.8;
  max-width: 580px;
}

.hero-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-dots {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 20;
}

.hero-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.hero-dot.active {
  background: white;
  width: 32px;
  border-radius: 10px;
}

/* ========== SECTIONS ========== */
.section {
  padding: 90px 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-badge {
  display: inline-block;
  background: rgba(13, 148, 136, 0.1);
  color: var(--primary-dark);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 14px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 14px;
  line-height: 1.3;
}

.section-header p {
  color: var(--gray-600);
  font-size: 1.05rem;
}

/* ========== HOW IT WORKS ========== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
}

.step-card {
  background: white;
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
  border: 1px solid var(--gray-100);
}

.step-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.step-num {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 20px;
  margin: 0 auto 20px;
  box-shadow: 0 6px 20px rgba(13, 148, 136, 0.3);
}

.step-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--dark);
}

.step-card p {
  color: var(--gray-600);
  font-size: 0.95rem;
}

/* ========== BENEFITS ========== */
.benefits-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.benefit-card {
  background: white;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-100);
  transition: var(--transition);
}

.benefit-card:hover {
  border-color: var(--primary-light);
  box-shadow: 0 8px 30px rgba(13, 148, 136, 0.12);
}

.benefit-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 16px;
}

.benefit-icon.teal {
  background: rgba(13, 148, 136, 0.12);
  color: var(--primary);
}

.benefit-icon.amber {
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent-dark);
}

.benefit-icon.blue {
  background: rgba(59, 130, 246, 0.12);
  color: var(--secondary);
}

.benefit-card h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.benefit-card p {
  color: var(--gray-600);
  font-size: 0.95rem;
}

.benefits-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ========== STATS ========== */
.stats-section {
  background: linear-gradient(135deg, var(--primary-dark), #0e7490);
  color: white;
  padding: 70px 0;
  position: relative;
  overflow: hidden;
}

.stats-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
  position: relative;
  z-index: 2;
}

.stat-item h3 {
  font-size: 2.6rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.stat-item p {
  opacity: 0.9;
  font-size: 1rem;
}

/* ========== FEATURE CARDS ========== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.feature-card {
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--gray-100);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.feature-img {
  height: 180px;
  background: linear-gradient(135deg, #ccfbf1, #99f6e4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  position: relative;
}

.feature-body {
  padding: 24px;
}

.feature-body h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.feature-body p {
  color: var(--gray-600);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

/* ========== CTA SECTION ========== */
.cta-section {
  background: linear-gradient(135deg, #0f766e 0%, #134e4a 50%, #1e3a5f 100%);
  color: white;
  padding: 80px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(20, 184, 166, 0.2) 0%, transparent 70%);
  top: -100px;
  left: -100px;
  border-radius: 50%;
}

.cta-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin-bottom: 16px;
}

.cta-content p {
  font-size: 1.1rem;
  opacity: 0.92;
  margin-bottom: 32px;
}

/* ========== FOOTER ========== */
.footer {
  background: var(--dark);
  color: var(--gray-400);
  padding: 70px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand .logo {
  color: white;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.95rem;
  line-height: 1.7;
  max-width: 300px;
}

.footer h4 {
  color: white;
  font-size: 1.05rem;
  margin-bottom: 18px;
  font-weight: 600;
}

.footer ul li {
  margin-bottom: 10px;
}

.footer ul a:hover {
  color: var(--primary-light);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.9rem;
}

.version-badge {
  background: rgba(13, 148, 136, 0.2);
  color: var(--primary-light);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

/* ========== PAGE HEADER ========== */
.page-header {
  background: linear-gradient(135deg, var(--primary-dark), #0e7490);
  color: white;
  padding: 140px 0 70px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin-bottom: 12px;
}

.page-header p {
  opacity: 0.9;
  max-width: 560px;
  margin: 0 auto;
}

/* ========== FORMS ========== */
.form-card {
  background: white;
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-100);
  max-width: 520px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--gray-700);
  font-size: 14px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 15px;
  transition: var(--transition);
  background: var(--gray-50);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  background: white;
  box-shadow: 0 0 0 4px rgba(13, 148, 136, 0.12);
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

/* ========== DASHBOARD ========== */
.dashboard-layout {
  display: flex;
  min-height: 100vh;
  background: var(--gray-50);
}

.sidebar {
  width: 260px;
  background: white;
  border-right: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--gray-100);
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  color: var(--gray-600);
  font-weight: 500;
  margin-bottom: 4px;
  font-size: 14.5px;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  background: rgba(13, 148, 136, 0.1);
  color: var(--primary-dark);
}

.sidebar-nav .icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
}

.main-content {
  flex: 1;
  margin-left: 260px;
  padding: 24px;
}

.dash-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 16px;
}

.dash-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
}

.dash-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 28px;
}

.dash-card {
  background: white;
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-100);
}

.dash-card .label {
  font-size: 13px;
  color: var(--gray-500);
  margin-bottom: 6px;
}

.dash-card .value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--dark);
}

.dash-card .change {
  font-size: 13px;
  margin-top: 6px;
  color: var(--success);
}

.table-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-100);
  overflow: hidden;
}

.table-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.table-header h3 {
  font-size: 1.1rem;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 14px 18px;
  text-align: left;
  font-size: 14px;
}

th {
  background: var(--gray-50);
  font-weight: 600;
  color: var(--gray-600);
  border-bottom: 1px solid var(--gray-200);
}

td {
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
}

tr:last-child td {
  border-bottom: none;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.badge-success { background: rgba(16, 185, 129, 0.12); color: #059669; }
.badge-warning { background: rgba(245, 158, 11, 0.12); color: #d97706; }
.badge-danger { background: rgba(239, 68, 68, 0.12); color: #dc2626; }
.badge-info { background: rgba(59, 130, 246, 0.12); color: #2563eb; }

/* ========== AUTH PAGES ========== */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f0fdfa 0%, #e0f2fe 50%, #fef3c7 100%);
  padding: 40px 20px;
}

.auth-card {
  background: white;
  border-radius: 20px;
  padding: 40px;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-lg);
}

.auth-card .logo {
  justify-content: center;
  margin-bottom: 28px;
}

.auth-card h2 {
  text-align: center;
  margin-bottom: 8px;
  font-size: 1.6rem;
}

.auth-card .subtitle {
  text-align: center;
  color: var(--gray-500);
  margin-bottom: 28px;
  font-size: 0.95rem;
}

.auth-footer {
  text-align: center;
  margin-top: 24px;
  font-size: 14px;
  color: var(--gray-600);
}

.auth-footer a {
  color: var(--primary);
  font-weight: 600;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 992px) {
  .nav-links { display: none; }
  .mobile-toggle { display: block; }
  .benefits-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .sidebar { transform: translateX(-100%); }
  .main-content { margin-left: 0; }
}

@media (max-width: 576px) {
  .hero { min-height: 560px; }
  .hero-btns { flex-direction: column; }
  .stats-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .dash-cards { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
}

/* Mobile Nav */
.mobile-nav {
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: white;
  padding: 16px;
  box-shadow: var(--shadow-lg);
  display: none;
  flex-direction: column;
  gap: 4px;
  z-index: 999;
}

.mobile-nav.open { display: flex; }

.mobile-nav a {
  padding: 12px 16px;
  border-radius: 8px;
  font-weight: 500;
}

.mobile-nav a:hover {
  background: rgba(13, 148, 136, 0.08);
  color: var(--primary);
}