/* ============================================
   IdeaForge — Design System & Tokens
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* ---------- Design Tokens ---------- */
:root {
  /* Primary palette */
  --primary-h: 250;
  --primary-s: 84%;
  --primary-l: 64%;
  --primary: hsl(var(--primary-h), var(--primary-s), var(--primary-l));
  --primary-light: hsl(var(--primary-h), var(--primary-s), 74%);
  --primary-dark: hsl(var(--primary-h), var(--primary-s), 50%);
  --primary-alpha-10: hsla(var(--primary-h), var(--primary-s), var(--primary-l), 0.10);
  --primary-alpha-20: hsla(var(--primary-h), var(--primary-s), var(--primary-l), 0.20);
  --primary-alpha-30: hsla(var(--primary-h), var(--primary-s), var(--primary-l), 0.30);

  /* Accent palette */
  --accent-h: 170;
  --accent-s: 78%;
  --accent-l: 55%;
  --accent: hsl(var(--accent-h), var(--accent-s), var(--accent-l));
  --accent-light: hsl(var(--accent-h), var(--accent-s), 70%);
  --accent-dark: hsl(var(--accent-h), var(--accent-s), 42%);
  --accent-alpha-10: hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.10);
  --accent-alpha-20: hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.20);

  /* Semantic colors */
  --success: hsl(145, 65%, 50%);
  --success-bg: hsla(145, 65%, 50%, 0.12);
  --warning: hsl(38, 95%, 60%);
  --warning-bg: hsla(38, 95%, 60%, 0.12);
  --danger: hsl(0, 78%, 62%);
  --danger-bg: hsla(0, 78%, 62%, 0.12);
  --info: hsl(210, 85%, 60%);
  --info-bg: hsla(210, 85%, 60%, 0.12);

  /* Gradient */
  --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  --gradient-primary-hover: linear-gradient(135deg, var(--primary-light) 0%, var(--accent-light) 100%);
  --gradient-subtle: linear-gradient(135deg, var(--primary-alpha-10) 0%, var(--accent-alpha-10) 100%);
  --gradient-glow: radial-gradient(ellipse at 50% 0%, var(--primary-alpha-20) 0%, transparent 70%);

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

  --text-xs: 0.6875rem;    /* 11px */
  --text-sm: 0.8125rem;    /* 13px */
  --text-base: 0.9375rem;  /* 15px */
  --text-lg: 1.0625rem;    /* 17px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */

  --font-light: 300;
  --font-regular: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  /* 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 */

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-2xl: 28px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.15), 0 2px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.2), 0 4px 12px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.25), 0 8px 20px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 30px var(--primary-alpha-30);
  --shadow-glow-accent: 0 0 30px var(--accent-alpha-20);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-index layers */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal-backdrop: 300;
  --z-modal: 400;
  --z-toast: 500;
  --z-tooltip: 600;
  --z-fab: 250;

  /* Layout */
  --sidebar-width: 260px;
  --sidebar-collapsed-width: 68px;
  --header-height: 0px;
  --content-max-width: 1200px;
}

/* ---------- Dark Theme (Default) ---------- */
[data-theme="dark"], :root {
  --bg-primary: hsl(230, 25%, 8%);
  --bg-secondary: hsl(230, 22%, 11%);
  --bg-tertiary: hsl(230, 20%, 14%);
  --bg-elevated: hsl(230, 20%, 16%);
  --bg-hover: hsl(230, 20%, 18%);
  --bg-active: hsl(230, 20%, 22%);

  --surface: hsla(230, 20%, 16%, 0.7);
  --surface-hover: hsla(230, 20%, 20%, 0.8);
  --surface-active: hsla(230, 20%, 24%, 0.9);
  --surface-border: hsla(230, 20%, 30%, 0.4);

  /* Glassmorphism */
  --glass-bg: hsla(230, 20%, 14%, 0.6);
  --glass-border: hsla(230, 20%, 40%, 0.2);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --glass-blur: blur(20px);

  /* Text */
  --text-primary: hsl(220, 20%, 95%);
  --text-secondary: hsl(220, 15%, 65%);
  --text-tertiary: hsl(220, 10%, 45%);
  --text-disabled: hsl(220, 10%, 35%);
  --text-inverse: hsl(230, 25%, 8%);

  /* Borders */
  --border-default: hsla(220, 15%, 30%, 0.5);
  --border-hover: hsla(220, 15%, 40%, 0.6);
  --border-focus: var(--primary);

  /* Input */
  --input-bg: hsla(230, 20%, 12%, 0.8);
  --input-border: hsla(220, 15%, 28%, 0.5);
  --input-focus-border: var(--primary);
  --input-placeholder: var(--text-tertiary);

  /* Scrollbar */
  --scrollbar-track: transparent;
  --scrollbar-thumb: hsla(220, 15%, 35%, 0.4);
  --scrollbar-thumb-hover: hsla(220, 15%, 45%, 0.6);

  color-scheme: dark;
}

/* ---------- Light Theme ---------- */
[data-theme="light"] {
  --bg-primary: hsl(220, 20%, 97%);
  --bg-secondary: hsl(220, 18%, 94%);
  --bg-tertiary: hsl(220, 15%, 91%);
  --bg-elevated: hsl(0, 0%, 100%);
  --bg-hover: hsl(220, 15%, 93%);
  --bg-active: hsl(220, 15%, 89%);

  --surface: hsla(0, 0%, 100%, 0.8);
  --surface-hover: hsla(0, 0%, 100%, 0.9);
  --surface-active: hsla(0, 0%, 98%, 1);
  --surface-border: hsla(220, 15%, 80%, 0.5);

  --glass-bg: hsla(0, 0%, 100%, 0.65);
  --glass-border: hsla(220, 15%, 85%, 0.4);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --glass-blur: blur(20px);

  --text-primary: hsl(230, 25%, 12%);
  --text-secondary: hsl(220, 12%, 42%);
  --text-tertiary: hsl(220, 8%, 58%);
  --text-disabled: hsl(220, 8%, 72%);
  --text-inverse: hsl(0, 0%, 100%);

  --border-default: hsla(220, 15%, 82%, 0.6);
  --border-hover: hsla(220, 15%, 70%, 0.7);
  --border-focus: var(--primary);

  --input-bg: hsla(0, 0%, 100%, 0.9);
  --input-border: hsla(220, 15%, 78%, 0.5);
  --input-focus-border: var(--primary);
  --input-placeholder: var(--text-tertiary);

  --scrollbar-track: transparent;
  --scrollbar-thumb: hsla(220, 10%, 72%, 0.5);
  --scrollbar-thumb-hover: hsla(220, 10%, 60%, 0.7);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.1), 0 4px 12px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.12), 0 8px 20px rgba(0,0,0,0.06);

  color-scheme: light;
}

/* ---------- Body Styles ---------- */
body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

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

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

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

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

/* ---------- Selection ---------- */
::selection {
  background: var(--primary-alpha-30);
  color: var(--text-primary);
}

/* ---------- Focus Styles ---------- */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- App Layout ---------- */
#app {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: relative;
}

/* ---------- Sidebar ---------- */
.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-right: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: var(--z-sticky);
  transition: width var(--transition-fast), transform var(--transition-fast);
  flex-shrink: 0;
  overflow: hidden;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar-header {
  padding: var(--space-5) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  border-bottom: 1px solid var(--glass-border);
  min-height: 68px;
}

.sidebar-logo {
  width: 34px;
  height: 34px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--shadow-glow);
}

.sidebar-logo svg {
  width: 20px;
  height: 20px;
  color: white;
}

.sidebar-brand {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  white-space: nowrap;
}

.sidebar-brand h1 {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.sidebar-brand span {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  font-weight: var(--font-medium);
}

.sidebar.collapsed .sidebar-brand,
.sidebar.collapsed .nav-label,
.sidebar.collapsed .nav-item-text,
.sidebar.collapsed .sidebar-footer-text,
.sidebar.collapsed .nav-section-title {
  display: none;
}

.sidebar.collapsed .sidebar-header {
  justify-content: center;
  padding: var(--space-5) var(--space-3);
}

/* Navigation */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--space-3) var(--space-3);
}

.nav-section {
  margin-bottom: var(--space-4);
}

.nav-section-title {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-1);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  min-height: 40px;
}

.nav-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-subtle);
  opacity: 0;
  transition: opacity var(--transition-fast);
  border-radius: inherit;
}

.nav-item:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav-item:hover::before {
  opacity: 1;
}

.nav-item.active {
  color: var(--primary);
  background: var(--primary-alpha-10);
}

.nav-item.active::before {
  opacity: 1;
}

.nav-item.active::after {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background: var(--gradient-primary);
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
}

.nav-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.nav-item-text {
  position: relative;
  z-index: 1;
  white-space: nowrap;
}

.nav-badge {
  margin-left: auto;
  background: var(--primary-alpha-20);
  color: var(--primary);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  padding: 1px 8px;
  border-radius: var(--radius-full);
  position: relative;
  z-index: 1;
}

.sidebar.collapsed .nav-badge {
  display: none;
}

.sidebar.collapsed .nav-item {
  justify-content: center;
  padding: var(--space-2);
}

.sidebar.collapsed .nav-item::after {
  display: none;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: var(--space-3);
  border-top: 1px solid var(--glass-border);
  flex-shrink: 0;
}

.sidebar-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  width: 100%;
}

.sidebar-toggle:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.sidebar-toggle svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.sidebar.collapsed .sidebar-toggle {
  justify-content: center;
}

.sidebar.collapsed .sidebar-toggle svg {
  transform: rotate(180deg);
}

/* ---------- Main Content ---------- */
.main-content {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
  background: var(--bg-primary);
}

.page-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--space-6) var(--space-8);
  position: relative;
}

/* Background gradient glow effect */
.main-content::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 500px;
  height: 500px;
  background: var(--gradient-glow);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.5;
}

/* Page header */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  position: relative;
  z-index: 1;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.page-title-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-extrabold);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.page-title-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-subtitle {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.page-actions {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

/* ---------- Utility Classes ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

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

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Mobile Responsive ---------- */
.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.mobile-menu-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.mobile-menu-btn svg {
  width: 22px;
  height: 22px;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: calc(var(--z-sticky) - 1);
  backdrop-filter: blur(4px);
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
    z-index: var(--z-modal);
    width: var(--sidebar-width) !important;
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  .sidebar.mobile-open + .sidebar-overlay,
  .sidebar-overlay.visible {
    display: block;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .page-container {
    padding: var(--space-4);
  }

  .page-header {
    margin-bottom: var(--space-4);
  }

  .page-title {
    font-size: var(--text-2xl);
  }
}

@media (max-width: 480px) {
  .page-container {
    padding: var(--space-3);
  }
}