@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;700&family=Manrope:wght@400;600;700&display=swap");

:root {
  --bg: #f6f7fb;
  --ink: #14213d;
  --muted: #5f6b84;
  --brand: #ff6b35;
  --brand-2: #0ea5e9;
  --brand-3: #22c55e;
  --surface: rgba(255, 255, 255, 0.78);
  --border: rgba(20, 33, 61, 0.1);
  --shadow: 0 14px 40px rgba(20, 33, 61, 0.12);
}

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

body {
  position: relative;
  overflow-x: hidden;
  font-family: "Manrope", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 8%, rgba(14, 165, 233, 0.2), transparent 35%),
    radial-gradient(circle at 92% 12%, rgba(255, 107, 53, 0.2), transparent 30%),
    var(--bg);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: auto auto -140px -120px;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(34, 197, 94, 0.24), transparent 65%);
  z-index: -1;
  animation: floatBlob 7s ease-in-out infinite alternate;
}

.navbar {
  width: min(1120px, 92%);
  margin: 18px auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 18px;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 34px;
  width: auto;
  display: block;
}

nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.navbar a {
  padding: 6px 10px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.navbar a:hover {
  color: var(--brand);
  background: rgba(255, 107, 53, 0.12);
}

.hero {
  width: min(1120px, 92%);
  margin: 26px auto 0;
  border-radius: 24px;
  padding: clamp(56px, 8vw, 96px) 24px;
  text-align: center;
  color: #fff;
  background:
    linear-gradient(120deg, rgba(20, 33, 61, 0.78), rgba(20, 33, 61, 0.35)),
    linear-gradient(130deg, #0ea5e9, #ff6b35);
  box-shadow: var(--shadow);
  animation: rise 0.5s ease-out;
}

.hero h1 {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(2rem, 4vw, 3.4rem);
  margin-bottom: 12px;
}

.hero p {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  max-width: 680px;
  margin: 0 auto 24px;
  opacity: 0.95;
}

.start-btn,
.card button {
  position: relative;
  overflow: hidden;
  border: none;
  border-radius: 999px;
  padding: 12px 24px;
  font-weight: 700;
  font-family: "Space Grotesk", sans-serif;
  cursor: pointer;
  background: linear-gradient(120deg, var(--brand), #ff8f5c);
  color: #fff;
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
  box-shadow: 0 10px 22px rgba(255, 107, 53, 0.3);
}

.start-btn:hover,
.card button:hover {
  transform: translateY(-2px);
  filter: brightness(1.04);
}

.start-btn::after,
.card button::after {
  content: "";
  position: absolute;
  top: -120%;
  left: -30%;
  width: 26%;
  height: 320%;
  background: rgba(255, 255, 255, 0.24);
  transform: rotate(18deg);
  transition: left 0.45s ease;
}

.start-btn:hover::after,
.card button:hover::after {
  left: 115%;
}

.login-note {
  margin-top: 14px;
  margin-bottom: 8px;
  font-weight: 600;
  opacity: 0.95;
}

.login-actions {
  margin-top: 4px;
  display: inline-grid;
  gap: 10px;
  justify-content: center;
}

.login-action-btn {
  border: 1px solid rgba(255, 255, 255, 0.58);
  border-radius: 999px;
  padding: 11px 18px;
  font-weight: 700;
  font-family: "Space Grotesk", sans-serif;
  cursor: pointer;
  color: #fff;
  transition: transform 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

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

.login-action-normal {
  background: rgba(20, 33, 61, 0.45);
}

.login-action-normal:hover {
  background: rgba(20, 33, 61, 0.6);
}

.login-action-google {
  background: linear-gradient(120deg, #4285f4, #34a853);
  border-color: rgba(255, 255, 255, 0.72);
}

.login-action-google:hover {
  background: linear-gradient(120deg, #3b78db, #2f944a);
}

.profile-section {
  width: min(1120px, 92%);
  margin: 20px auto 0;
}

.profile-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 20px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.profile-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.profile-head h2 {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
}

.profile-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.profile-btn {
  border: none;
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 700;
  font-family: "Space Grotesk", sans-serif;
  color: #fff;
  cursor: pointer;
  background: linear-gradient(120deg, #0ea5e9, #0284c7);
}

.logout-btn {
  background: linear-gradient(120deg, #ef4444, #dc2626);
}

.profile-line {
  color: var(--muted);
  margin: 4px 0;
  font-weight: 600;
}

.profile-subtitle {
  margin-top: 14px;
  margin-bottom: 10px;
  font-family: "Space Grotesk", sans-serif;
}

.profile-history {
  display: grid;
  gap: 8px;
  max-height: 360px;
  overflow-y: auto;
  padding-right: 6px;
  scroll-snap-type: y mandatory;
}

.history-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  min-height: 170px;
  scroll-snap-align: start;
}

.history-bars {
  display: grid;
  gap: 10px;
}

.history-row {
  display: grid;
  grid-template-columns: 90px 1fr 48px;
  align-items: center;
  gap: 10px;
}

.history-label {
  font-weight: 700;
  color: var(--ink);
}

.history-track {
  height: 12px;
  border-radius: 999px;
  background: rgba(19, 35, 63, 0.12);
  overflow: hidden;
}

.history-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
}

.history-fill.attempted {
  background: linear-gradient(120deg, #0ea5e9, #0284c7);
}

.history-fill.right {
  background: linear-gradient(120deg, #22c55e, #16a34a);
}

.history-fill.wrong {
  background: linear-gradient(120deg, #ef4444, #dc2626);
}

.history-fill.master {
  background: linear-gradient(120deg, #f59e0b, #d97706);
}

.history-value {
  text-align: right;
  font-weight: 800;
}

.categories,
.features {
  width: min(1120px, 92%);
  margin: 46px auto 0;
}

.categories h2,
.features h2 {
  position: relative;
  font-family: "Space Grotesk", sans-serif;
  text-align: center;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: 26px;
}

.categories h2::after,
.features h2::after {
  content: "";
  display: block;
  width: 82px;
  height: 4px;
  margin: 10px auto 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--brand-2), var(--brand));
}

.quiz-block {
  margin-top: 16px;
}

.quiz-block-title {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.1rem;
  margin-bottom: 14px;
  color: var(--ink);
}

.card-container,
.feature-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}

.card,
.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
  animation: rise 0.45s ease both;
}

.card:hover,
.feature:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 107, 53, 0.45);
}

.card-icon,
.feature-icon {
  font-size: 2rem;
  margin-bottom: 10px;
}

.q-tag {
  display: inline-block;
  margin: 8px 0 12px;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  font-family: "Space Grotesk", sans-serif;
  color: #0f172a;
  background: #e2e8f0;
}

.card:nth-child(2) {
  animation-delay: 0.06s;
}

.card:nth-child(3) {
  animation-delay: 0.12s;
}

.card:nth-child(4) {
  animation-delay: 0.18s;
}

.categories .card {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.72));
}

.categories .card::before {
  content: "";
  position: absolute;
  inset: -40% auto auto -30%;
  width: 170px;
  height: 170px;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.2), transparent 70%);
  pointer-events: none;
}

.categories .card::after {
  content: "";
  position: absolute;
  inset: auto -55% -65% auto;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.22), transparent 70%);
  pointer-events: none;
}

.categories .card:hover {
  transform: translateY(-8px) scale(1.01);
  box-shadow: 0 20px 45px rgba(20, 33, 61, 0.18);
}

.categories .card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 54px;
  height: 54px;
  padding: 0 14px;
  border-radius: 12px;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: #1e293b;
  background: #e2e8f0;
  border: 1px solid rgba(30, 41, 59, 0.16);
  box-shadow: none;
}

.categories .card h3 {
  margin-top: 12px;
}

.categories .card p {
  min-height: 70px;
}

.categories .card button {
  width: 100%;
}

.card h3 {
  font-family: "Space Grotesk", sans-serif;
  margin-bottom: 10px;
}

.card p,
.feature p {
  color: var(--muted);
  line-height: 1.5;
}

.card button {
  margin-top: 18px;
}

.card button:disabled {
  background: #94a3b8;
  box-shadow: none;
  cursor: not-allowed;
}

.card button:disabled:hover {
  transform: none;
  filter: none;
}

.footer {
  width: min(1120px, 92%);
  margin: 44px auto 24px;
  text-align: center;
  border-radius: 14px;
  padding: 16px;
  color: #fff;
  background: linear-gradient(90deg, #14213d, #1f3a6b);
  box-shadow: var(--shadow);
}

.login-modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 18px;
  background: rgba(9, 14, 28, 0.55);
  z-index: 5000;
}

.login-modal.open {
  display: flex;
}

.login-modal-card {
  width: min(420px, 96%);
  position: relative;
  border-radius: 16px;
  padding: 20px;
  background: #fff;
  color: var(--ink);
  box-shadow: 0 24px 50px rgba(20, 33, 61, 0.25);
}

.login-modal-card h3 {
  font-family: "Space Grotesk", sans-serif;
  margin-bottom: 14px;
}

.login-close-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  border: 1px solid rgba(20, 33, 61, 0.2);
  border-radius: 8px;
  width: 30px;
  height: 30px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

.login-form,
.signup-form {
  display: grid;
  gap: 10px;
}

.login-form label,
.signup-form label {
  font-weight: 700;
  font-size: 0.92rem;
}

.login-form input,
.signup-form input {
  border: 1px solid rgba(20, 33, 61, 0.2);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.95rem;
}

.login-submit-btn,
.create-account-btn {
  margin-top: 10px;
  border: none;
  border-radius: 999px;
  padding: 11px 16px;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  cursor: pointer;
}

.login-submit-btn {
  background: linear-gradient(120deg, var(--brand), #ff8f5c);
  color: #fff;
}

.create-account-btn {
  width: 100%;
  background: rgba(20, 33, 61, 0.08);
  color: var(--ink);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes floatBlob {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-16px);
  }
}

@media (max-width: 820px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
  }

  nav {
    gap: 10px 14px;
  }
}

@media (max-width: 600px) {
  .navbar {
    width: 94%;
    padding: 12px;
    border-radius: 12px;
  }

  .logo img {
    height: 30px;
  }

  nav {
    width: 100%;
    gap: 8px;
  }

  .navbar a {
    font-size: 0.92rem;
    padding: 6px 8px;
  }

  .hero {
    width: 94%;
    margin-top: 18px;
    border-radius: 18px;
    padding: 44px 16px;
  }

  .categories,
  .features {
    width: 94%;
    margin-top: 32px;
  }

  .card-container,
  .feature-cards {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .card,
  .feature {
    padding: 18px;
    border-radius: 14px;
  }

  .categories .card p {
    min-height: auto;
  }

  .start-btn,
  .login-action-btn,
  .card button {
    width: 100%;
    padding: 11px 18px;
  }

  .login-actions {
    width: 100%;
    display: grid;
    gap: 10px;
  }

  .footer {
    width: 94%;
    margin-top: 30px;
    margin-bottom: 18px;
    padding: 12px;
    font-size: 0.9rem;
  }
}