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

:root {
  --card-bg: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.12);
  --card-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.4);
  --accent: #f59e0b;
  --accent-hover: #fbbf24;
  --text: #f8fafc;
  --text-muted: rgba(248, 250, 252, 0.7);
  --input-bg: rgba(15, 23, 42, 0.4);
  --input-border: rgba(255, 255, 255, 0.1);
  --input-focus: rgba(245, 158, 11, 0.5);
  --radius: 16px;
  --radius-sm: 10px;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: 'Outfit', system-ui, sans-serif;
  min-height: 100vh;
  overflow: hidden;
}

/* Single viewport — no vertical scroll */
.viewport {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Background image */
.bg {
  position: absolute;
  inset: 0;
  background-image: var(--bg-src);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(30, 41, 59, 0.75) 100%);
  pointer-events: none;
}

/* Interactive login card */
.login-card {
  position: relative;
  width: min(400px, 92vw);
  padding: 2.5rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  backdrop-filter: blur(20px);
  box-shadow: var(--card-shadow);
  z-index: 1;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.5);
}

.login-card:focus-within {
  box-shadow: 0 0 0 2px var(--input-focus);
}

.card-glow {
  position: absolute;
  inset: -1px;
  border-radius: calc(var(--radius) + 1px);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), transparent 50%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.login-card:hover .card-glow {
  opacity: 1;
}

.card-inner {
  position: relative;
  z-index: 1;
}

.card-header {
  text-align: center;
  margin-bottom: 1.75rem;
}

.card-header h1 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}

.card-header p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* Form */
.login-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.field.row {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
}

input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="text"]::placeholder,
input[type="email"]::placeholder,
input[type="password"]::placeholder {
  color: rgba(248, 250, 252, 0.4);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--input-focus);
}

.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 400;
  cursor: pointer;
  font-size: 0.875rem;
}

.checkbox-label input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
  cursor: pointer;
}

.link {
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

.link:hover {
  color: var(--accent-hover);
}

.btn-primary {
  padding: 0.9rem 1.5rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: #0f172a;
  background: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  margin-top: 0.25rem;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-primary:active {
  transform: scale(0.98);
}

.signup-hint {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 1.25rem;
}

.signup-hint .link {
  font-weight: 500;
}

/* Error alert */
.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.alert-error {
  background: rgba(239, 68, 68, 0.2);
  border: 1px solid rgba(239, 68, 68, 0.5);
  color: #fca5a5;
}