:root {
  --bg-dark: #090d16;
  --bg-card: rgba(17, 24, 39, 0.75);
  --border-color: rgba(255, 255, 255, 0.1);
  --border-glow: rgba(56, 189, 248, 0.35);
  --primary: #38bdf8;
  --primary-hover: #0ea5e9;
  --primary-glow: rgba(56, 189, 248, 0.5);
  --accent-purple: #818cf8;
  --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --error: #f43f5e;
  --error-bg: rgba(244, 63, 94, 0.12);
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.12);
  --radius-lg: 20px;
  --radius-md: 12px;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
}

body {
  background-color: var(--bg-dark);
  background-image: 
    radial-gradient(at 0% 0%, rgba(56, 189, 248, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(129, 140, 248, 0.12) 0px, transparent 50%),
    radial-gradient(at 50% 50%, rgba(192, 132, 252, 0.08) 0px, transparent 50%);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
  padding: 20px;
  padding-top: max(20px, env(safe-area-inset-top, 20px));
  padding-bottom: max(20px, env(safe-area-inset-bottom, 20px));
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

.login-container {
  width: 100%;
  max-width: 440px;
  perspective: 1000px;
  animation: fadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.login-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6), 0 0 40px rgba(56, 189, 248, 0.08);
  position: relative;
  overflow: hidden;
}

.login-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
}

.brand-header {
  text-align: center;
  margin-bottom: 32px;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 9999px;
  margin-bottom: 16px;
}

.brand-badge svg {
  width: 14px;
  height: 14px;
  animation: pulse 2s infinite;
}

.brand-title {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(180deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 6px;
}

.brand-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.alert-box {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  margin-bottom: 24px;
  display: none;
  align-items: flex-start;
  gap: 10px;
  line-height: 1.4;
  animation: slideDown 0.3s ease;
}

.alert-box.error {
  display: flex;
  background: var(--error-bg);
  border: 1px solid rgba(244, 63, 94, 0.3);
  color: #fecdd3;
}

.alert-box.success {
  display: flex;
  background: var(--success-bg);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #a7f3d0;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.84rem;
  font-weight: 600;
  color: #cbd5e1;
  margin-bottom: 8px;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.input-icon svg {
  width: 18px;
  height: 18px;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 14px 12px 42px;
  color: #ffffff;
  font-size: 16px; /* iOS Safari zoom prevention */
  transition: all 0.2s ease;
}

input[type="text"]:focus,
input[type="password"]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
  background: rgba(15, 23, 42, 0.85);
}

.toggle-password {
  position: absolute;
  right: 14px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
}

.toggle-password:hover {
  color: var(--text-main);
}

.toggle-password svg {
  width: 18px;
  height: 18px;
}

.btn-submit {
  width: 100%;
  background: var(--accent-gradient);
  color: #04101e;
  border: none;
  border-radius: var(--radius-md);
  padding: 13px 20px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 26px;
  box-shadow: 0 8px 20px -4px var(--primary-glow);
}

.btn-submit:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px -4px var(--primary-glow);
  filter: brightness(1.08);
}

.btn-submit:active:not(:disabled) {
  transform: translateY(0);
}

.btn-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  filter: grayscale(0.5);
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(4, 16, 30, 0.3);
  border-top-color: #04101e;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: none;
}

.btn-submit.loading .spinner {
  display: block;
}

.btn-submit.loading span {
  display: none;
}

.security-footer {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.76rem;
  color: #64748b;
  text-align: center;
}

.security-footer svg {
  width: 14px;
  height: 14px;
  color: var(--success);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}