/* ───────── RESET & VARIABLES ───────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #050505;
  --surface: rgba(15, 15, 18, 0.7);
  --border: rgba(255, 255, 255, 0.1);
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.5);
  --accent-secondary: #8b5cf6;
  --text: #ffffff;
  --text-muted: #9ca3af;
  --radius-lg: 24px;
  --radius-md: 12px;
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Outfit', sans-serif;
}

h1 {
  position: absolute;
  left: -9999px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg);
  background-image: 
    radial-gradient(circle at 0% 0%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 100% 100%, rgba(139, 92, 246, 0.15) 0%, transparent 50%);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

/* ───────── ANIMATED BACKGROUND ───────── */
.background-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.4;
  animation: float 20s infinite alternate ease-in-out;
}

.orb-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow), transparent 70%);
  top: -200px;
  left: -100px;
}

.orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.4), transparent 70%);
  bottom: -150px;
  right: -100px;
  animation-delay: -5s;
}

.orb-3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.2), transparent 70%);
  top: 40%;
  left: 60%;
  animation-duration: 25s;
}

@keyframes float {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(100px, 50px) scale(1.1); }
  100% { transform: translate(-50px, 100px) scale(0.9); }
}

/* ───────── NAV ───────── */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 32px 64px;
  z-index: 100;
}

.logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.75rem;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: transform 0.3s ease;
}

.logo:hover {
  transform: scale(1.02);
}

.logo span {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ───────── AUTH LAYOUT ───────── */
.auth-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  position: relative;
  z-index: 10;
}

.auth-card {
  background: var(--surface);
  backdrop-filter: blur(32px);
  -webkit-backdrop-filter: blur(32px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 56px;
  width: 100%;
  max-width: 480px;
  box-shadow: 
    0 25px 50px -12px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.05) inset;
  animation: cardEnter 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes cardEnter {
  from { opacity: 0; transform: translateY(40px) scale(0.95); filter: blur(10px); }
  to { opacity: 1; transform: translateY(0) scale(1); filter: blur(0); }
}

.auth-title {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.025em;
  background: linear-gradient(to bottom, #fff, #a1a1aa);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.auth-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 40px;
  line-height: 1.5;
}

.form-group {
  margin-bottom: 28px;
  animation: itemFadeUp 0.6s ease both;
}

.form-group:nth-child(1) { animation-delay: 0.2s; }
.form-group:nth-child(2) { animation-delay: 0.3s; }

@keyframes itemFadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.form-group label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.875rem;
  color: #d1d5db;
  font-weight: 600;
  margin-left: 4px;
}

.form-control {
  width: 100%;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--text);
  font-family: var(--font-main);
  font-size: 1rem;
  outline: none;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.form-control::placeholder {
  color: rgba(255, 255, 255, 0.2);
}

.form-control:focus {
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
  transform: translateY(-1px);
}

/* ───────── BUTTONS ───────── */
.btn {
  width: 100%;
  padding: 16px;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  margin-top: 12px;
  position: relative;
  overflow: hidden;
  animation: itemFadeUp 0.6s ease both;
  animation-delay: 0.4s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: white;
  box-shadow: 0 10px 25px -5px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 30px -5px rgba(59, 130, 246, 0.5);
  filter: brightness(1.1);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: 0.5s;
}

.btn-primary:hover::after {
  left: 100%;
}

.auth-links {
  text-align: center;
  margin-top: 36px;
  font-size: 0.95rem;
  color: var(--text-muted);
  animation: itemFadeUp 0.6s ease both;
  animation-delay: 0.5s;
}

.auth-links a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 700;
  transition: all 0.2s;
  padding: 4px 8px;
  border-radius: 6px;
}

.auth-links a:hover {
  color: #fff;
  background: rgba(59, 130, 246, 0.1);
  text-decoration: underline;
}

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

.password-toggle {
  position: absolute;
  right: 12px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  border-radius: 8px;
  z-index: 10;
}

.password-toggle:hover {
  color: var(--accent);
  background: rgba(255, 255, 255, 0.05);
}

.form-control {
  padding-right: 48px; /* Room for toggle button */
}

/* ───────── MESSAGES ───────── */
#errorMsg, #successMsg {
  padding: 12px;
  border-radius: 8px;
  margin-top: 16px;
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
  animation: shake 0.4s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

/* ───────── MOBILE RESPONSIVENESS ───────── */
@media (max-width: 640px) {
  nav { padding: 24px; }
  .auth-card { padding: 40px 24px; }
  .auth-title { font-size: 1.875rem; }
  .logo { font-size: 1.5rem; }
}