/* assets/css/style.css */

:root {
  --primary: #1d4ed8;
  --primary-dark: #102a5e;
  --accent: #f97316;
  --bg: #edf3fb;
  --surface: #ffffff;
  --dark: #0f172a;
  --text: #1f2937;
  --muted: #64748b;
  --border: #d6e2f1;
  --success: #166534;
  --success-bg: #dcfce7;
  --error: #991b1b;
  --error-bg: #fee2e2;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: "Poppins", sans-serif;
  background: linear-gradient(180deg, #f8fbff 0%, var(--bg) 40%, #f8fbff 100%);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
}

.main-content {
  min-height: 62vh;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.main-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
}

.header-flex {
  min-height: 76px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 26px;
  font-weight: 700;
  color: var(--dark);
}

.logo-image {
  width: 42px;
  height: 42px;
  object-fit: contain;
  transition:
    transform 0.2s ease,
    filter 0.2s ease;
}

.logo span {
  color: var(--primary);
}

.logo a:hover .logo-image {
  transform: translateY(-1px) scale(1.04);
  filter: drop-shadow(0 6px 12px rgba(29, 78, 216, 0.2));
}

.menu-toggle {
  display: none;
  margin-left: auto;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--dark);
  cursor: pointer;
}

.nav-menu {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-menu > a {
  position: relative;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
}

.nav-menu > a:not(.btn-login)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -5px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--primary);
  transition: width 0.2s ease;
}

.nav-menu > a:not(.btn-login):hover::after {
  width: 100%;
}

.nav-auth {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-login {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.2px;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.btn-login i {
  font-size: 12px;
}

.btn-login-student {
  color: #ffffff;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.24);
}

.btn-login-teacher {
  color: var(--dark);
  background: #ffffff;
  border-color: #b9c8dd;
}

.btn-login:hover {
  transform: translateY(-2px);
}

.btn-login-student:hover {
  box-shadow: 0 14px 24px rgba(37, 99, 235, 0.32);
}

.btn-login-teacher:hover {
  box-shadow: 0 12px 22px rgba(15, 23, 42, 0.14);
}

.header-actions {
  margin-left: 8px;
}

.user-box {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #ffffff;
}

.user-box span {
  max-width: 130px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 14px;
  font-weight: 600;
}

.user-box a {
  color: var(--muted);
}

.btn-primary,
.btn-secondary,
.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    color 0.2s ease,
    background 0.2s ease;
}

.btn-primary {
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  box-shadow: 0 12px 24px rgba(16, 42, 94, 0.28);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 28px rgba(16, 42, 94, 0.34);
}

.btn-secondary {
  color: #ffffff;
  background: linear-gradient(135deg, #ea580c, var(--accent));
  box-shadow: 0 10px 22px rgba(249, 115, 22, 0.26);
}

.btn-secondary:hover {
  transform: translateY(-2px);
}

.btn-outline {
  color: var(--primary);
  background: #ffffff;
  border-color: #9eb6d7;
}

.btn-outline:hover {
  color: #ffffff;
  background: var(--primary);
  border-color: var(--primary);
  transform: translateY(-2px);
}

.section {
  padding: 78px 0;
}

.section-alt {
  background: #f4f8ff;
}

.section-title {
  max-width: 700px;
  margin: 0 auto 40px;
  text-align: center;
}

.section-title h2 {
  font-size: clamp(26px, 3vw, 34px);
  color: var(--dark);
  line-height: 1.25;
}

.section-title p {
  margin-top: 8px;
  color: var(--muted);
}

.hero-section {
  padding: 82px 0 74px;
  background:
    radial-gradient(circle at 8% 8%, rgba(37, 99, 235, 0.22), transparent 40%),
    radial-gradient(
      circle at 92% 0%,
      rgba(249, 115, 22, 0.22),
      transparent 36%
    ),
    linear-gradient(160deg, #0b152d 0%, #0f2451 48%, #12306b 100%);
  color: #ffffff;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  gap: 34px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: rgba(255, 255, 255, 0.1);
  font-size: 13px;
  margin-bottom: 16px;
}

.hero-copy h1 {
  font-size: clamp(30px, 5vw, 43px);
  line-height: 1.18;
}

.hero-lead {
  margin-top: 14px;
  max-width: 60ch;
  font-size: 17px;
  color: #cdd9f0;
}

.lang-slider-container {
  position: relative;
  /* Add min-height to prevent layout jumps when sliding */
  min-height: 220px;
}

.lang-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition:
    opacity 0.8s ease,
    transform 0.8s ease;
}

.lang-slide.active-slide {
  position: relative;
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-points {
  margin-top: 24px;
  list-style: none;
  display: grid;
  gap: 9px;
  color: #e2e8f0;
}

.hero-points i {
  color: #86efac;
  margin-right: 8px;
}

.hero-image-slider {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 24px 45px rgba(3, 7, 18, 0.32);
  background: rgba(255, 255, 255, 0.1);
}

.hero-slides {
  width: 100%;
  height: 100%;
  position: relative;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transform: scale(1.05);
  transition:
    opacity 1.2s ease,
    transform 1.2s ease;
  pointer-events: none;
}

.hero-slide.active-slide {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

.stats-strip {
  border-top: 1px solid #d8e3f2;
  border-bottom: 1px solid #d8e3f2;
  background: #ffffff;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  padding: 28px 0;
}

.stat-item {
  border: 1px solid #e2ebf7;
  border-radius: 14px;
  padding: 16px 18px;
  background: #f8fbff;
}

.stat-item h3 {
  color: var(--primary-dark);
  font-size: 24px;
  line-height: 1.2;
}

.stat-item p {
  margin-top: 5px;
  color: var(--muted);
  font-size: 14px;
}

.feature-grid,
.board-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-card,
.board-card {
  border: 1px solid #dee8f4;
  border-radius: 16px;
  padding: 22px;
  background: #ffffff;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.feature-card:hover,
.board-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 26px rgba(15, 23, 42, 0.08);
}

.feature-card i {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
}

.feature-card h3,
.board-card h3 {
  font-size: 20px;
  line-height: 1.3;
  color: var(--dark);
}

.feature-card p,
.board-card p {
  margin-top: 7px;
  color: var(--muted);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.step-card {
  position: relative;
  border: 1px solid #deebf8;
  border-radius: 16px;
  padding: 24px 20px 20px;
  background: #ffffff;
}

.step-number {
  position: absolute;
  top: -13px;
  left: 18px;
  width: 30px;
  height: 30px;
  border-radius: 999px;
  background: linear-gradient(135deg, #ea580c, var(--accent));
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
}

.step-card h3 {
  margin-top: 8px;
  color: var(--dark);
}

.step-card p {
  margin-top: 8px;
  color: var(--muted);
}

.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
}

.faq-list details {
  border: 1px solid #dce8f6;
  border-radius: 14px;
  padding: 14px 16px;
  background: #ffffff;
}

.faq-list summary {
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--dark);
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list p {
  margin-top: 8px;
  color: var(--muted);
}

.cta-banner {
  border: 1px solid #d8e7f7;
  border-radius: 18px;
  padding: 28px;
  display: flex;
  gap: 20px;
  justify-content: space-between;
  align-items: center;
  background:
    radial-gradient(circle at 8% 10%, rgba(37, 99, 235, 0.13), transparent 42%),
    #ffffff;
}

.cta-banner h2 {
  color: var(--dark);
  font-size: clamp(24px, 3.5vw, 34px);
  line-height: 1.2;
}

.cta-banner p {
  margin-top: 6px;
  color: var(--muted);
}

.page-hero {
  padding: 64px 0 52px;
  background:
    radial-gradient(circle at 14% 8%, rgba(37, 99, 235, 0.2), transparent 34%),
    linear-gradient(160deg, #0b152d 0%, #13316a 100%);
  color: #ffffff;
}

.page-hero h1 {
  font-size: clamp(30px, 4.5vw, 42px);
  line-height: 1.2;
}

.page-hero p {
  margin-top: 8px;
  color: #c9d9f4;
}

.contact-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 20px;
  align-items: start;
}

.contact-card,
.legal-content {
  border: 1px solid #dce8f6;
  border-radius: 16px;
  background: #ffffff;
  padding: 24px;
  box-shadow: 0 12px 26px rgba(15, 23, 42, 0.06);
}

.contact-card h3 {
  color: var(--dark);
  margin-bottom: 10px;
}

.contact-card p {
  margin-bottom: 10px;
  color: var(--muted);
}

.contact-card p i {
  width: 18px;
  color: var(--primary);
  margin-right: 6px;
}

.contact-card .muted {
  color: #7b8ba3;
  font-size: 14px;
}

.alert-success,
.alert-error {
  border-radius: 12px;
  padding: 10px 12px;
  margin-bottom: 14px;
  font-size: 14px;
}

.alert-success {
  color: var(--success);
  background: var(--success-bg);
}

.alert-error {
  color: var(--error);
  background: var(--error-bg);
}

.contact-form {
  display: grid;
  gap: 10px;
}

.contact-form label {
  font-size: 14px;
  font-weight: 500;
  color: var(--dark);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid #c7d7eb;
  border-radius: 10px;
  padding: 11px 12px;
  font-size: 14px;
  font-family: inherit;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
}

.contact-form .btn-primary {
  margin-top: 4px;
}

.legal-content {
  display: grid;
  gap: 12px;
}

.legal-content h2 {
  font-size: 22px;
  line-height: 1.2;
  color: var(--dark);
}

.legal-content p {
  color: var(--muted);
}

.legal-content a {
  color: var(--primary);
}

.premium-footer {
  margin-top: 36px;
  padding: 62px 0 24px;
  background: linear-gradient(160deg, #08132b 0%, #0d1f44 100%);
  color: #cbd5e1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr 1.2fr;
  gap: 24px;
}

.footer-logo {
  color: #ffffff;
  font-size: 28px;
}

.footer-logo span {
  color: #60a5fa;
}

.footer-desc {
  margin-top: 10px;
  color: #9fb3ce;
}

.social-icons {
  margin-top: 16px;
  display: flex;
  gap: 10px;
}

.social-icons a {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  border: 1px solid rgba(148, 163, 184, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #e2e8f0;
  transition:
    transform 0.2s ease,
    background 0.2s ease;
}

.social-icons a:hover {
  transform: translateY(-2px);
  background: rgba(96, 165, 250, 0.2);
}

.footer-col h3 {
  color: #ffffff;
  margin-bottom: 12px;
}

.footer-col ul {
  list-style: none;
  display: grid;
  gap: 8px;
}

.footer-col li a {
  color: #a7bad4;
  transition: color 0.2s ease;
}

.footer-col li a:hover {
  color: #ffffff;
}

.footer-col p {
  color: #a7bad4;
  margin-bottom: 9px;
}

.footer-col p i {
  color: #60a5fa;
  margin-right: 6px;
}

.footer-note {
  margin-top: 6px;
  font-size: 14px;
}

.footer-bottom {
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid rgba(148, 163, 184, 0.25);
  text-align: center;
  color: #9fb3ce;
  font-size: 14px;
}

.dev-logo {
  width: auto;
  height: 22px;
  margin-left: 6px;
  vertical-align: middle;
  transition: transform 0.2s ease;
}

.dev-logo-link:hover .dev-logo {
  transform: scale(1.08);
}

@media (max-width: 1080px) {
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .steps-grid,
  .board-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 992px) {
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 82px;
    right: 4%;
    width: min(320px, 92vw);
    background: #ffffff;
    border: 1px solid #d5e1f1;
    border-radius: 14px;
    box-shadow: 0 20px 36px rgba(15, 23, 42, 0.16);
    padding: 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-menu > a {
    display: inline-block;
    width: 100%;
  }

  .nav-menu > a:not(.btn-login)::after {
    display: none;
  }

  .nav-auth {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .btn-login {
    width: 100%;
  }

  .hero-layout {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cta-banner {
    flex-direction: column;
    align-items: flex-start;
  }

  .contact-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .section {
    padding: 62px 0;
  }

  .hero-actions .btn-primary,
  .hero-actions .btn-outline,
  .cta-banner .btn-primary {
    width: 100%;
  }

  .feature-grid,
  .steps-grid,
  .board-grid,
  .stats-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    padding: 22px;
  }
}