/**
 * RemoteTerm Design System - 2025 Edition
 * Premium terminal experience with refined aesthetics
 */

/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */

:root {
  /* === Color Palette === */

  /* Primary - Deep Purple/Indigo Gradient */
  --color-primary-50: #f5f3ff;
  --color-primary-100: #ede9fe;
  --color-primary-200: #ddd6fe;
  --color-primary-300: #c4b5fd;
  --color-primary-400: #a78bfa;
  --color-primary-500: #8b5cf6;
  --color-primary-600: #7c3aed;
  --color-primary-700: #6d28d9;
  --color-primary-800: #5b21b6;
  --color-primary-900: #4c1d95;

  /* Surface - Rich Blacks with Blue Tints */
  --color-surface-50: #f8fafc;
  --color-surface-100: #f1f5f9;
  --color-surface-200: #e2e8f0;
  --color-surface-300: #cbd5e1;
  --color-surface-400: #94a3b8;
  --color-surface-500: #64748b;
  --color-surface-600: #475569;
  --color-surface-700: #334155;
  --color-surface-800: #1e293b;
  --color-surface-850: #151b2b;
  --color-surface-900: #0f1419;
  --color-surface-950: #0a0e1a;

  /* Accent Colors */
  --color-blue-400: #60a5fa;
  --color-blue-500: #3b82f6;
  --color-blue-600: #2563eb;

  --color-emerald-400: #34d399;
  --color-emerald-500: #10b981;
  --color-emerald-600: #059669;

  --color-rose-400: #fb7185;
  --color-rose-500: #f43f5e;
  --color-rose-600: #e11d48;

  --color-amber-400: #fbbf24;
  --color-amber-500: #f59e0b;
  --color-amber-600: #d97706;

  /* Terminal Colors - Tokyo Night Inspired */
  --terminal-bg: #1a1b26;
  --terminal-fg: #a9b1d6;
  --terminal-cursor: #c0caf5;
  --terminal-selection: #33467c;

  /* Semantic Colors */
  --color-background: var(--color-surface-950);
  --color-surface: var(--color-surface-900);
  --color-surface-elevated: var(--color-surface-850);
  --color-border: var(--color-surface-700);
  --color-border-subtle: var(--color-surface-800);

  --color-text-primary: #f1f5f9;
  --color-text-secondary: #cbd5e1;
  --color-text-tertiary: #94a3b8;
  --color-text-muted: #64748b;

  --color-success: var(--color-emerald-500);
  --color-warning: var(--color-amber-500);
  --color-error: var(--color-rose-500);
  --color-info: var(--color-blue-500);

  /* === Typography === */
  --font-family-sans: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* === Spacing === */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */

  /* === Sizing === */
  --size-header: 3.5rem;  /* 56px */
  --size-sidebar: 16rem;  /* 256px */
  --size-icon-sm: 1rem;
  --size-icon-md: 1.25rem;
  --size-icon-lg: 1.5rem;

  /* === Borders === */
  --border-radius-sm: 0.375rem;  /* 6px */
  --border-radius-md: 0.5rem;    /* 8px */
  --border-radius-lg: 0.75rem;   /* 12px */
  --border-radius-xl: 1rem;      /* 16px */
  --border-radius-full: 9999px;

  --border-width: 1px;
  --border-width-thick: 2px;

  /* === Shadows === */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  --shadow-glow-primary: 0 0 20px rgba(139, 92, 246, 0.3);
  --shadow-glow-blue: 0 0 20px rgba(59, 130, 246, 0.3);
  --shadow-glow-success: 0 0 20px rgba(16, 185, 129, 0.3);

  /* === Transitions === */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* === Z-Index === */
  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ============================================
   GLOBAL STYLES
   ============================================ */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background: var(--color-background);
  overflow-x: hidden;
}

/* ============================================
   TYPOGRAPHY UTILITIES
   ============================================ */

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }
.text-4xl { font-size: var(--font-size-4xl); }

.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.font-mono { font-family: var(--font-family-mono); }

.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-muted { color: var(--color-text-muted); }

/* ============================================
   COMPONENT: BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border: none;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  outline: none;
  white-space: nowrap;
}

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

/* Button Variants */
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-600), var(--color-primary-500));
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--color-primary-700), var(--color-primary-600));
  box-shadow: var(--shadow-glow-primary);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--color-surface-elevated);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-surface-700);
  border-color: var(--color-border-subtle);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--color-surface-elevated);
  color: var(--color-text-primary);
}

.btn-success {
  background: var(--color-success);
  color: white;
}

.btn-success:hover:not(:disabled) {
  background: var(--color-emerald-600);
  box-shadow: var(--shadow-glow-success);
  transform: translateY(-1px);
}

.btn-danger {
  background: var(--color-error);
  color: white;
}

.btn-danger:hover:not(:disabled) {
  background: var(--color-rose-600);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
}

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
}

.btn-icon {
  padding: var(--space-2);
  aspect-ratio: 1;
}

/* ============================================
   COMPONENT: CARDS
   ============================================ */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--color-primary-500);
  box-shadow: var(--shadow-lg);
}

.card-elevated {
  background: var(--color-surface-elevated);
  box-shadow: var(--shadow-md);
}

.card-glass {
  background: rgba(15, 20, 25, 0.8);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-taskbar {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface-elevated);
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
  align-items: center;
}

.card-taskbar .btn {
  flex-shrink: 0;
}

/* Medium screens - double stack (2 columns) */
@media (max-width: 1024px) {
  .card-taskbar {
    flex-wrap: wrap;
  }

  .card-taskbar .btn {
    flex: 0 0 calc(50% - var(--space-1));
  }
}

/* Small screens - wrap buttons into rows */
@media (max-width: 768px) {
  .card-taskbar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .card-taskbar .btn {
    flex: 0 1 auto;
    min-width: fit-content;
    font-size: var(--font-size-xs);
    padding: var(--space-2) var(--space-3);
  }
}

/* ============================================
   COMPONENT: INPUTS
   ============================================ */

.input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  font-family: inherit;
  color: var(--color-text-primary);
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  outline: none;
  transition: all var(--transition-base);
}

.input:focus {
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

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

/* ============================================
   COMPONENT: MODALS & OVERLAYS
   ============================================ */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn var(--transition-base);
}

.modal {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-2xl);
  max-height: 90vh;
  max-width: 90vw;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  z-index: var(--z-modal);
  animation: modalSlideIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  padding: var(--space-8);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-surface);
}

.modal-body {
  flex: 1;
  padding: var(--space-8);
  overflow-y: auto;
}

.modal-body::-webkit-scrollbar {
  width: 6px;
}

.modal-body::-webkit-scrollbar-track {
  background: transparent;
}

.modal-body::-webkit-scrollbar-thumb {
  background: var(--color-surface-600);
  border-radius: 3px;
}

.modal-body::-webkit-scrollbar-thumb:hover {
  background: var(--color-surface-500);
}

.modal-footer {
  padding: var(--space-8);
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
  background: var(--color-surface);
}

/* ============================================
   COMPONENT: NAVIGATION
   ============================================ */

.nav-tabs {
  display: flex;
  gap: var(--space-1);
  border-bottom: 1px solid var(--color-border);
}

.nav-tab {
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
}

.nav-tab:hover {
  color: var(--color-text-primary);
  background: var(--color-surface-elevated);
}

.nav-tab.active {
  color: var(--color-primary-500);
  border-bottom-color: var(--color-primary-500);
}

/* ============================================
   COMPONENT: STATUS INDICATORS
   ============================================ */

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--border-radius-full);
  display: inline-block;
}

.status-dot.success { background: var(--color-success); }
.status-dot.error { background: var(--color-error); }
.status-dot.warning { background: var(--color-warning); }
.status-dot.info { background: var(--color-info); }

.status-dot.pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.hidden { display: none !important; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.rounded-sm { border-radius: var(--border-radius-sm); }
.rounded { border-radius: var(--border-radius-md); }
.rounded-lg { border-radius: var(--border-radius-lg); }
.rounded-xl { border-radius: var(--border-radius-xl); }
.rounded-full { border-radius: var(--border-radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* Background utilities */
.bg-surface { background: var(--color-surface); }
.bg-surface-elevated { background: var(--color-surface-elevated); }
.bg-background { background: var(--color-background); }
.bg-gray-800 { background: var(--color-surface-800); }
.bg-gray-850 { background: var(--color-surface-850); }
.bg-gray-900 { background: var(--color-surface-900); }

/* Border utilities */
.border { border: 1px solid var(--color-border); }
.border-b { border-bottom: 1px solid var(--color-border); }
.border-t { border-top: 1px solid var(--color-border); }
.border-l { border-left: 1px solid var(--color-border); }
.border-r { border-right: 1px solid var(--color-border); }
.border-gray-700 { border-color: var(--color-border); }
.border-gray-800 { border-color: var(--color-border-subtle); }

/* Padding utilities */
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: 5px; }

.transition { transition: all var(--transition-base); }
.transition-fast { transition: all var(--transition-fast); }
.transition-slow { transition: all var(--transition-slow); }

/* ============================================
   SCROLLBAR STYLING
   ============================================ */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-surface-900);
}

::-webkit-scrollbar-thumb {
  background: var(--color-surface-600);
  border-radius: var(--border-radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-surface-500);
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.animate-fadeIn { animation: fadeIn var(--transition-base) ease-out; }
.animate-slideUp { animation: slideUp var(--transition-base) ease-out; }
.animate-slideDown { animation: slideDown var(--transition-base) ease-out; }
.animate-scaleIn { animation: scaleIn var(--transition-base) ease-out; }