:root {
  --bg-primary: #020c2b;
  --bg-gradient-start: #061b60;
  --bg-gradient-end: #02113f;
  --bg-composed:
    radial-gradient(circle at 20% 20%, color-mix(in srgb, var(--bg-gradient-start) 75%, transparent)),
    radial-gradient(circle at 80% 30%, color-mix(in srgb, var(--bg-gradient-end) 65%, transparent)),
    radial-gradient(circle at 50% 80%, color-mix(in srgb, var(--bg-primary) 55%, transparent)),
    linear-gradient(145deg, var(--bg-primary) 0%, var(--bg-gradient-start) 52%, var(--bg-gradient-end) 100%);
  --text-primary: #e8f1ff;
  --text-muted: rgba(232, 241, 255, 0.7);
  --glass-surface: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.25);
  --glass-shadow: 0 20px 50px rgba(5, 10, 40, 0.55);
  --accent-cyan: #4fdfff;
  --accent-indigo: #5d67ff;
  --accent-purple: #8455ff;
  --accent-primary: var(--accent-cyan);
  --warning: #ffaf3a;
  --danger: #ff4f6b;
  --success: #00d693;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg-primary: #f6f8ff;
  --bg-gradient-start: #e8efff;
  --bg-gradient-end: #dfe7ff;
  --bg-composed:
    radial-gradient(circle at 20% 20%, color-mix(in srgb, var(--bg-gradient-start) 75%, transparent)),
    radial-gradient(circle at 80% 30%, color-mix(in srgb, var(--bg-gradient-end) 65%, transparent)),
    radial-gradient(circle at 50% 80%, color-mix(in srgb, var(--bg-primary) 55%, transparent)),
    linear-gradient(145deg, var(--bg-primary) 0%, var(--bg-gradient-start) 52%, var(--bg-gradient-end) 100%);
  --text-primary: #0f172a;
  --text-muted: rgba(15, 23, 42, 0.72);
  --glass-surface: rgba(255, 255, 255, 0.92);
  --glass-border: rgba(15, 23, 42, 0.12);
  --glass-shadow: 0 20px 50px rgba(9, 12, 41, 0.12);
  --accent-cyan: #0ea5e9;
  --accent-indigo: #6366f1;
  --accent-purple: #8b5cf6;
  --accent-primary: var(--accent-cyan);
  --warning: #f59e0b;
  --danger: #ef4444;
  --success: #10b981;
  color-scheme: light;
}

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

html,
body {
  margin: 0;
  padding: 0;
  font-family: "Pretendard", "Inter", "Segoe UI", sans-serif;
  background: var(--bg-composed);
  color: var(--text-primary);
  min-height: 100vh;
  background-attachment: fixed;
}

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

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

button {
  font: inherit;
  border: none;
  cursor: pointer;
  background: none;
  color: inherit;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

[hidden] {
  display: none !important;
}

body[data-auth-state="signed-in"] [data-auth-when="signed-out"],
body[data-auth-state="signed-out"] [data-auth-when="signed-in"] {
  display: none !important;
}

.glass-card {
  backdrop-filter: blur(18px);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.14), rgba(60, 95, 190, 0.08));
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  box-shadow: var(--glass-shadow);
}

.glass-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  border-radius: 999px;
  padding: 0.9rem 1.9rem;
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0.2));
  color: #071433;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.glass-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px rgba(56, 180, 255, 0.28);
  border-color: rgba(255, 255, 255, 0.5);
}

.glass-button.subtle {
  background: rgba(255, 255, 255, 0.08);
  color: #f8fbff;
  border-color: rgba(255, 255, 255, 0.2);
  text-transform: none;
  letter-spacing: 0.02em;
}

.glass-button.subtle:hover {
  transform: none;
  box-shadow: none;
  border-color: rgba(255, 255, 255, 0.4);
}

.link-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.6rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  font-weight: 600;
  letter-spacing: 0.05em;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.link-button:hover {
  border-color: rgba(79, 223, 255, 0.7);
  background: rgba(79, 223, 255, 0.12);
}

.link-button.subtle {
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
  border-color: rgba(255, 255, 255, 0.15);
}

.link-button.subtle:hover {
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.08);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.18);
  border-radius: 999px;
}

::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.2);
}