:root {
  --bg: #0a0d14;
  --bg-2: #0f1420;
  --card: #141b2c;
  --border: #1f2a40;
  --text: #e8ecf4;
  --muted: #8b96a9;
  --accent: #6c7cff;
  --accent-2: #4fd1c5;
  --danger: #ff5c7a;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(600px 400px at 15% 0%, rgba(108, 124, 255, 0.12), transparent),
    radial-gradient(600px 400px at 90% 10%, rgba(79, 209, 197, 0.10), transparent);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.hidden {
  display: none !important;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(10, 13, 20, 0.75);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}

.logo {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--text);
  text-decoration: none;
}

.logo span {
  color: var(--accent-2);
}

.nav {
  display: flex;
  gap: 28px;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--text);
}

.user-box {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-name {
  font-weight: 600;
  color: var(--accent-2);
}

/* Buttons */
.btn {
  border: none;
  border-radius: 10px;
  padding: 10px 18px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0a0d14;
}

.btn-primary:hover {
  box-shadow: 0 0 24px rgba(108, 124, 255, 0.45);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.btn-outline:hover {
  background: rgba(108, 124, 255, 0.1);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

.btn-block {
  width: 100%;
  margin-top: 8px;
}

/* Hero */
.hero {
  padding: 120px 24px 80px;
  text-align: center;
}

.hero-title {
  font-size: clamp(34px, 6vw, 58px);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 18px;
}

.hero-title span {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  color: var(--muted);
  font-size: 18px;
  max-width: 560px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  padding-bottom: 80px;
}

.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  transition: transform 0.2s, border-color 0.2s;
}

.feature:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.feature-icon {
  font-size: 30px;
  margin-bottom: 14px;
}

.feature h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.feature p {
  color: var(--muted);
  font-size: 14px;
}

/* About */
.about {
  padding-bottom: 100px;
  max-width: 700px;
  text-align: center;
}

.about h2 {
  font-size: 28px;
  margin-bottom: 14px;
}

.about p {
  color: var(--muted);
  font-size: 16px;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(6, 8, 14, 0.75);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal {
  position: relative;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 18px;
  width: 100%;
  max-width: 420px;
  padding: 34px 30px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 16px;
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 18px;
  cursor: pointer;
}

.modal-close:hover {
  color: var(--text);
}

.tabs {
  display: flex;
  gap: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 5px;
  margin-bottom: 26px;
}

.tab {
  flex: 1;
  padding: 9px;
  border: none;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.tab.active {
  background: var(--accent);
  color: #0a0d14;
}

.form-title {
  font-size: 22px;
  margin-bottom: 20px;
}

.auth-form label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  margin: 14px 0 6px;
}

.auth-form input {
  width: 100%;
  padding: 12px 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.auth-form input:focus {
  border-color: var(--accent);
}

.form-error {
  margin-top: 12px;
  color: var(--danger);
  font-size: 13px;
}