/* ========================================
   AI CHAT PRO - DESIGN SYSTEM
   Color Scheme: Dark & Gold
   Font: Montserrat
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;500;600;700&display=swap');

/* ========== CSS VARIABLES ========== */
:root {
  /* Primary colors */
  --primary-gold: #FFC407;
  --primary-gold-dark: #e6b007;
  --primary-gold-light: #ffcf33;

  /* Dark colors */
  --dark-primary: #2c2c2c;
  --dark-secondary: #1a1a1a;

  /* Light colors */
  --white: #ffffff;
  --light-bg: #fafafa;
  --light-bg-gradient: #f8fafc;

  /* Text colors */
  --text-primary: #1f2937;
  --text-secondary: #374151;
  --text-muted: #6b7280;

  /* Status colors */
  --success-green: #4ade80;
  --error-red: #ef4444;

  /* Transparency */
  --overlay-light: rgba(255, 255, 255, 0.95);
  --overlay-dark: rgba(0, 0, 0, 0.5);
  --border-light: rgba(255, 255, 255, 0.2);
  --border-subtle: rgba(0, 0, 0, 0.05);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.1);

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 20px;
  --radius-full: 50%;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 20px;
  --spacing-2xl: 25px;

  /* Font sizes */
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 15px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 20px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ========== BASE STYLES ========== */
body {
  font-family: var(--font-family);
  background: linear-gradient(135deg, var(--dark-primary) 0%, var(--dark-secondary) 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-xl);
  color: var(--text-primary);
}

/* ========== ANIMATIONS ========== */
@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0.3; }
}

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

/* ========== CONTAINERS ========== */
.chat-container {
  width: 100%;
  height: 100%;
  background: var(--white);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ========== HEADER ========== */
.chat-header {
  background: linear-gradient(135deg, var(--primary-gold) 0%, var(--primary-gold-dark) 100%);
  color: var(--dark-secondary);
  padding: var(--spacing-xl) var(--spacing-2xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.chat-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
  animation: shimmer 3s infinite;
  pointer-events: none;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  z-index: 1;
}

.ai-avatar {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-gold), var(--primary-gold-light));
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  animation: pulse 2s infinite;
}

.header-info h1 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  margin-bottom: 2px;
}

.status {
  font-size: var(--font-size-sm);
  opacity: 0.9;
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--success-green);
  border-radius: var(--radius-full);
  animation: blink 1.5s infinite;
}

/* ========== CHAT BODY ========== */
.chat-body {
  flex: 1;
  padding: var(--spacing-xl);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  background: linear-gradient(180deg, var(--light-bg) 0%, var(--light-bg-gradient) 100%);
}

/* Center welcome message vertically */
.chat-body:has(.welcome-message) {
  justify-content: center;
}

/* ========== WELCOME MESSAGE ========== */
.welcome-message {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto;
}

.welcome-message h2 {
  font-size: 24px;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.welcome-message p {
  font-size: var(--font-size-base);
  line-height: 1.6;
}

/* ========== INPUT AREA ========== */
.chat-input {
  padding: var(--spacing-lg) var(--spacing-xl);
  background: var(--white);
  border-top: 1px solid #e5e7eb;
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-end;
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}

.input-wrapper {
  flex: 1;
  position: relative;
}

#message {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid #e5e7eb;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  resize: none;
  max-height: 120px;
  transition: border-color var(--transition-fast);
  line-height: 1.5;
}

#message:focus {
  outline: none;
  border-color: var(--primary-gold);
}

/* ========== BUTTONS ========== */
.btn-primary {
  background: linear-gradient(135deg, var(--primary-gold), var(--primary-gold-dark));
  color: var(--dark-secondary);
  border: none;
  padding: var(--spacing-md) 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 196, 7, 0.4);
}

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

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  .chat-container {
    height: 95vh;
    border-radius: var(--spacing-md);
  }

  .chat-header {
    padding: var(--spacing-lg);
  }

  .header-info h1 {
    font-size: var(--font-size-xl);
  }

  .chat-body {
    padding: var(--spacing-md);
  }

  .chat-input {
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
  }

  .input-wrapper textarea {
    font-size: 16px; /* Prevents zoom on iOS */
  }

  .chat-input button {
    padding: var(--spacing-md);
    min-width: 70px;
  }

  .welcome-message {
    padding: var(--spacing-lg);
  }

  .welcome-message h2 {
    font-size: var(--font-size-xl);
  }
}

/* Extra small devices */
@media (max-width: 480px) {
  .chat-input {
    flex-direction: row;
    align-items: flex-end;
  }

  .input-wrapper {
    flex: 1;
  }

  .chat-input button {
    height: 44px;
    min-height: 44px;
  }
}

/* ========== LOGIN FORM ========== */
.login-container {
  width: 100%;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--dark-primary) 0%, var(--dark-secondary) 100%);
  padding: var(--spacing-xl);
}

.login-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 40px;
  max-width: 420px;
  width: 100%;
  animation: slideIn 0.5s ease;
}

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

.login-header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--primary-gold), var(--primary-gold-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.login-header p {
  color: var(--text-muted);
  font-size: var(--font-size-base);
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid #e5e7eb;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
  box-sizing: border-box;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary-gold);
  box-shadow: 0 0 0 3px rgba(255, 196, 7, 0.1);
}

.form-group input:disabled {
  background: #f9fafb;
  cursor: not-allowed;
}

.error-message {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--error-red);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  text-align: center;
}

.login-button {
  width: 100%;
  margin-top: 8px;
  padding: 14px;
  font-size: var(--font-size-md);
  justify-content: center;
}

.test-credentials {
  margin-top: 24px;
  padding: 16px;
  background: #f9fafb;
  border-radius: var(--radius-md);
  border: 1px solid #e5e7eb;
}

.credentials-title {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.credentials-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.credential-item {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  padding: 8px;
  background: var(--white);
  border-radius: var(--radius-sm);
}

.credential-item strong {
  color: var(--primary-gold-dark);
  margin-right: 8px;
}

@media (max-width: 480px) {
  .login-container {
    padding: var(--spacing-md);
  }

  .login-card {
    padding: 28px 24px;
  }

  .login-header h1 {
    font-size: 24px;
  }
}