/* =====================================================
   BASE STYLES
   Reset, Typography, Shared Components, Animations
   ===================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-theme),
              color var(--transition-theme);
}

/* Smooth theme transition for all elements */
body.theme-transitioning * {
  transition: background-color var(--transition-theme),
              color var(--transition-theme),
              border-color var(--transition-theme),
              box-shadow var(--transition-theme) !important;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--primary-hover); }

img { max-width: 100%; display: block; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  font-family: var(--font-family);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(255,255,255,0.2), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.btn:hover::after { opacity: 1; }
.btn:active { transform: scale(0.97); }
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}
.btn-primary:hover {
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  backdrop-filter: blur(10px);
}
.btn-secondary:hover {
  background: var(--surface-hover);
  border-color: var(--primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
}
.btn-ghost:hover {
  background: var(--primary-subtle);
  color: var(--primary);
}

/* ---------- Input Fields ---------- */
.input-group {
  position: relative;
  margin-bottom: var(--space-lg);
}

.input-group .input-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  transition: color var(--transition-fast);
  pointer-events: none;
  z-index: 1;
  display: flex;
  align-items: center;
}

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

.input-field {
  width: 100%;
  padding: 0.875rem 1rem 0.875rem 2.85rem;
  font-family: var(--font-family);
  font-size: 0.95rem;
  color: var(--text-primary);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  box-shadow: var(--input-shadow);
  outline: none;
  transition: all var(--transition-normal);
}

.input-field::placeholder { color: var(--text-muted); }

.input-field:focus {
  border-color: var(--primary);
  box-shadow: var(--input-shadow), 0 0 0 3px var(--primary-subtle), var(--shadow-sm);
}

.input-field:focus ~ .input-icon { color: var(--primary); }

.input-group .toggle-password {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-fast);
  z-index: 1;
}
.input-group .toggle-password:hover { color: var(--text-primary); }
.input-group .toggle-password svg { width: 18px; height: 18px; }

/* ---------- Messages ---------- */
.message {
  display: none;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--space-lg);
}

.message-error {
  background: rgba(239, 68, 68, 0.12);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.message-success {
  background: rgba(16, 185, 129, 0.12);
  color: #6ee7b7;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.message svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ---------- Spinner ---------- */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.spinner-dark {
  border-color: var(--border-light);
  border-top-color: var(--primary);
}

/* ---------- Loading Overlay ---------- */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  transition: opacity 0.4s ease;
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-pulse {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-primary);
  animation: pulse-glow 1.5s ease-in-out infinite;
}

/* ---------- Divider ---------- */
.divider {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin: var(--space-xl) 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-light);
}

/* ---------- Keyframe Animations ---------- */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(100%); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes slideOutRight {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(100%); }
}

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

@keyframes pulse-glow {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
    box-shadow: 0 0 0 0 rgba(0, 102, 255, 0.3);
  }
  50% {
    transform: scale(1.1);
    opacity: 0.8;
    box-shadow: 0 0 30px 10px rgba(0, 102, 255, 0.1);
  }
}

@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  33%      { transform: translateY(-20px) rotate(5deg); }
  66%      { transform: translateY(10px) rotate(-3deg); }
}

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ---------- Utility Classes ---------- */
.fade-in  { animation: fadeIn 0.5s ease forwards; }
.slide-up { animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards; }

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }