* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors */
  --color-dark: #1a1d1e;
  --color-accent: #00d4aa;
  --color-accent-hover: #00c49b;
  --color-accent-glow: rgba(0, 212, 170, 0.35);
  --color-border: #d0d7df;
  --color-muted: #7a8694;
  --color-surface: #ffffff;
  --color-text-secondary: #4a5568;
  --color-text-tertiary: #5a6270;
  --color-error: #a23028;
  --color-error-bg: linear-gradient(135deg, #fef2f2 0%, #fde8e8 100%);
  --color-error-border: #f5c6c6;
  --color-warning: #92400e;
  --color-warning-bg: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
  --color-warning-border: #fcd34d;
  --color-danger: #c0392b;
  --page-background: #e8ecf1;
  --rainbow-gradient: linear-gradient(90deg, #FF6B6B, #FFE66D, #4ECDC4, #A29BFE, #FF6B9D);

  /* Typography */
  --font-display: 'Poppins', sans-serif;

  /* Spacing & Sizing */
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 6px 16px rgba(0, 0, 0, 0.08), 0 3px 8px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12), 0 6px 16px rgba(0, 0, 0, 0.06);
  --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.15), 0 10px 24px rgba(0, 0, 0, 0.08);
  --shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.02);
  --shadow-inset-light: inset 0 1px 0 rgba(255, 255, 255, 0.8);
  --shadow-inset-light-subtle: inset 0 1px 0 rgba(255, 255, 255, 0.2);

  /* Gradients */
  --gradient-surface: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  --gradient-surface-alt: linear-gradient(180deg, #ffffff 0%, #fafbfc 100%);
  --gradient-dark: linear-gradient(135deg, #2d3436 0%, #1a1d1e 100%);
  --gradient-dark-hover: linear-gradient(135deg, #3d4548 0%, #2d3436 100%);
  --gradient-accent: linear-gradient(135deg, var(--color-accent) 0%, #00c49b 100%);
  --gradient-accent-hover: linear-gradient(135deg, #00e6b8 0%, var(--color-accent) 100%);

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-index layers */
  --z-dropdown: 100;
  --z-modal: 1000;
}

body {
  min-height: 100vh;
  font-family: system-ui, -apple-system, sans-serif;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(0, 212, 170, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(162, 155, 254, 0.08) 0%, transparent 50%),
    linear-gradient(160deg, #f5f7fa 0%, #e8edf3 40%, #dde4ed 100%);
  background-attachment: fixed;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.u-text-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.u-flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.u-disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ==========================================================================
   Base Component Styles
   ========================================================================== */

/* Shared input styles */
.input-base {
  width: 100%;
  font: 14px var(--font-display);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
  box-sizing: border-box;
  box-shadow: var(--shadow-md), var(--shadow-inset);
  transition: all var(--transition-normal);
}

.input-base:focus {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg), 0 0 0 4px var(--color-accent-glow);
}

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

.input-base:disabled {
  opacity: 0.5;
}

/* Shared button styles */
.btn-base {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 12px 16px;
  font: 600 14px var(--font-display);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-base:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  color: var(--color-text-secondary);
  background: var(--gradient-surface);
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-sm), var(--shadow-inset-light);
}

.btn-secondary:hover:not(:disabled) {
  color: var(--color-dark);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md), 0 0 0 3px var(--color-accent-glow);
  transform: translateY(-2px);
}

.btn-secondary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-primary {
  color: #fff;
  background: var(--gradient-accent);
  border: none;
  box-shadow: 0 4px 14px var(--color-accent-glow), var(--shadow-inset-light-subtle);
}

.btn-primary:hover:not(:disabled) {
  background: var(--gradient-accent-hover);
  box-shadow: 0 6px 20px var(--color-accent-glow), var(--shadow-inset-light-subtle);
  transform: translateY(-2px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 8px var(--color-accent-glow);
}

/* Shared error message styles */
.error-message {
  padding: 10px 12px;
  margin-bottom: 8px;
  font: 14px var(--font-display);
  color: var(--color-error);
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  border-radius: var(--radius);
}

/* Shared warning message styles */
.warning-message {
  padding: 10px 12px;
  margin-bottom: 8px;
  font: 14px var(--font-display);
  color: var(--color-warning);
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  border-radius: var(--radius);
}