/* =========================
   Root Variables
========================= */
:root {
  --bg-gradient: linear-gradient(135deg, #1f1f1f, #111);
  --text-color: #fff;
  --muted-color: #aaa;
  --accent: #00d4ff;
  --accent-dark: #00a5cc;
  --input-bg: #333;
  --input-bg-focus: #444;
  --card-bg: #222;
  --card-radius: 16px;
  --shadow-light: rgba(0,0,0,0.5);
  --shadow-heavy: rgba(0,0,0,0.7);
}

/* =========================
   Reset
========================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', system-ui, sans-serif;
}

/* =========================
   Body
========================= */
body {
  background: var(--bg-gradient);
  color: var(--text-color);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* =========================
   Login Container
========================= */
.login-container {
  width: 100%;
  max-width: 400px;
  padding: 2rem;
}

.login-card {
  background: var(--card-bg);
  border-radius: var(--card-radius);
  box-shadow: 0 8px 32px var(--shadow-light);
  padding: 2rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 48px var(--shadow-heavy);
}

/* =========================
   Header
========================= */
.login-header h1 {
  font-size: 2rem;
  margin-bottom: 0.25rem;
  color: var(--accent);
  text-align: center;
}

.login-header p {
  font-size: 0.9rem;
  color: var(--muted-color);
  margin-bottom: 1.5rem;
  text-align: center;
}

/* =========================
   Form Inputs
========================= */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  border: none;
  background: var(--input-bg);
  color: var(--text-color);
  font-size: 1rem;
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus {
  background: var(--input-bg-focus);
  outline: none;
  transform: scale(1.02);
  box-shadow: 0 0 0 2px rgba(0,212,255,0.3);
}

/* =========================
   Login Button
========================= */
.btn-login {
  width: 100%;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: 12px;
  background: var(--accent);
  color: #111;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s ease, transform 0.2s ease;
}

.btn-login:hover {
  background: var(--accent-dark);
  transform: scale(1.03);
}

/* =========================
   Footer
========================= */
.login-footer {
  margin-top: 1rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted-color);
}

.login-footer a {
  color: var(--accent);
  text-decoration: none;
  margin: 0 0.25rem;
  transition: color 0.2s ease;
}

.login-footer a:hover {
  color: var(--accent-dark);
}

/* =========================
   Form Error
========================= */
.form-error {
  color: #ff6b6b;
  font-size: 0.8rem;
  margin-top: 0.25rem;
  text-align: left;
}

/* =========================
   Loading Overlay
========================= */
#loading-overlay {
  display: none; /* hidden by default */
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(30, 41, 59, 0.85);
  z-index: 9999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: system-ui, sans-serif;
  color: #fff;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

#loading-overlay.show {
  display: flex;
  opacity: 1;
  pointer-events: all;
}

/* =========================
   Loader Dots
========================= */
.loader {
  display: flex;
  gap: 0.5rem;
}

.loader span {
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  display: block;
  animation: bounce 0.6s infinite alternate;
}

.loader span:nth-child(2) {
  animation-delay: 0.2s;
}

.loader span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes bounce {
  0% {
    transform: translateY(0);
    opacity: 0.6;
  }
  100% {
    transform: translateY(-15px);
    opacity: 1;
  }
}

/* =========================
   Loading Text
========================= */
#loading-overlay p {
  margin-top: 1rem;
  font-size: 1rem;
  color: #e5e7eb;
  letter-spacing: 0.5px;
}