/**
 * NexaNotes — Enterprise Design System
 * ======================================
 * Modern SaaS-grade UI with:
 * - CSS Custom Properties (variables)
 * - Dark/Light mode with system detection
 * - Glassmorphism components
 * - Micro-animations & transitions
 * - Responsive grid system
 * - Premium component library
 */

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

/* ═══════════════════════════════════════════════════════════
   1. CSS CUSTOM PROPERTIES — DESIGN TOKENS
   ═══════════════════════════════════════════════════════════ */

:root {
  /* --- Color Palette (Dark Mode Default) --- */
  --clr-bg-primary:    #0a0f1e;
  --clr-bg-secondary:  #0f172a;
  --clr-bg-tertiary:   #1e293b;
  --clr-bg-elevated:   #1e2d45;
  --clr-bg-glass:      rgba(15, 23, 42, 0.7);
  --clr-bg-hover:      rgba(99, 102, 241, 0.08);
  --clr-bg-active:     rgba(99, 102, 241, 0.15);

  /* Brand Colors */
  --clr-brand:         #6366f1;
  --clr-brand-light:   #818cf8;
  --clr-brand-dark:    #4f46e5;
  --clr-brand-alpha:   rgba(99, 102, 241, 0.2);
  --clr-brand-glow:    rgba(99, 102, 241, 0.4);

  --clr-purple:        #8b5cf6;
  --clr-pink:          #ec4899;
  --clr-cyan:          #06b6d4;
  --clr-emerald:       #10b981;
  --clr-amber:         #f59e0b;
  --clr-red:           #ef4444;
  --clr-orange:        #f97316;

  /* Text */
  --clr-text-primary:   #f1f5f9;
  --clr-text-secondary: #94a3b8;
  --clr-text-tertiary:  #64748b;
  --clr-text-muted:     #475569;
  --clr-text-inverse:   #0f172a;

  /* Borders */
  --clr-border:         rgba(148, 163, 184, 0.12);
  --clr-border-medium:  rgba(148, 163, 184, 0.2);
  --clr-border-strong:  rgba(148, 163, 184, 0.35);
  --clr-border-brand:   rgba(99, 102, 241, 0.5);

  /* Status Colors */
  --clr-success:        #10b981;
  --clr-warning:        #f59e0b;
  --clr-error:          #ef4444;
  --clr-info:           #3b82f6;

  --clr-success-bg:     rgba(16, 185, 129, 0.1);
  --clr-warning-bg:     rgba(245, 158, 11, 0.1);
  --clr-error-bg:       rgba(239, 68, 68, 0.1);
  --clr-info-bg:        rgba(59, 130, 246, 0.1);

  /* --- Typography --- */
  --font-sans:    'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Outfit', 'Inter', sans-serif;
  --font-mono:    'Fira Code', 'Cascadia Code', monospace;

  --fs-xs:   0.75rem;     /* 12px */
  --fs-sm:   0.875rem;    /* 14px */
  --fs-base: 1rem;        /* 16px */
  --fs-md:   1.125rem;    /* 18px */
  --fs-lg:   1.25rem;     /* 20px */
  --fs-xl:   1.5rem;      /* 24px */
  --fs-2xl:  1.875rem;    /* 30px */
  --fs-3xl:  2.25rem;     /* 36px */
  --fs-4xl:  3rem;        /* 48px */

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

  --lh-tight:  1.25;
  --lh-snug:   1.375;
  --lh-normal: 1.5;
  --lh-relaxed:1.625;
  --lh-loose:  2;

  /* --- Spacing Scale --- */
  --sp-1:   0.25rem;    /* 4px */
  --sp-2:   0.5rem;     /* 8px */
  --sp-3:   0.75rem;    /* 12px */
  --sp-4:   1rem;       /* 16px */
  --sp-5:   1.25rem;    /* 20px */
  --sp-6:   1.5rem;     /* 24px */
  --sp-7:   1.75rem;    /* 28px */
  --sp-8:   2rem;       /* 32px */
  --sp-10:  2.5rem;     /* 40px */
  --sp-12:  3rem;       /* 48px */
  --sp-16:  4rem;       /* 64px */
  --sp-20:  5rem;       /* 80px */
  --sp-24:  6rem;       /* 96px */

  /* --- Border Radius --- */
  --r-sm:   0.25rem;   /* 4px */
  --r-md:   0.5rem;    /* 8px */
  --r-lg:   0.75rem;   /* 12px */
  --r-xl:   1rem;      /* 16px */
  --r-2xl:  1.5rem;    /* 24px */
  --r-3xl:  2rem;      /* 32px */
  --r-full: 9999px;

  /* --- Shadows --- */
  --shadow-xs:   0 1px 2px rgba(0,0,0,0.3);
  --shadow-sm:   0 2px 8px rgba(0,0,0,0.35), 0 1px 3px rgba(0,0,0,0.25);
  --shadow-md:   0 4px 16px rgba(0,0,0,0.4), 0 2px 6px rgba(0,0,0,0.3);
  --shadow-lg:   0 8px 32px rgba(0,0,0,0.45), 0 4px 12px rgba(0,0,0,0.35);
  --shadow-xl:   0 20px 60px rgba(0,0,0,0.5), 0 8px 24px rgba(0,0,0,0.4);
  --shadow-brand: 0 0 20px rgba(99,102,241,0.3), 0 4px 16px rgba(99,102,241,0.2);
  --shadow-glass: 0 8px 32px rgba(0,0,0,0.3), inset 0 1px 0 rgba(255,255,255,0.05);

  /* --- 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: 300ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* --- Layout --- */
  --sidebar-width:          260px;
  --sidebar-collapsed-width: 68px;
  --topbar-height:           60px;
  --content-max-width:      1440px;
  --panel-width:            380px;

  /* --- Z-Index Scale --- */
  --z-below:   -1;
  --z-base:     1;
  --z-elevated: 10;
  --z-sticky:   100;
  --z-overlay:  200;
  --z-modal:    300;
  --z-popover:  400;
  --z-tooltip:  500;
  --z-toast:    600;
}

/* Light Mode Overrides */
[data-theme="light"] {
  --clr-bg-primary:    #f8fafc;
  --clr-bg-secondary:  #ffffff;
  --clr-bg-tertiary:   #f1f5f9;
  --clr-bg-elevated:   #e8edf5;
  --clr-bg-glass:      rgba(255, 255, 255, 0.8);
  --clr-bg-hover:      rgba(99, 102, 241, 0.06);
  --clr-bg-active:     rgba(99, 102, 241, 0.12);

  --clr-text-primary:   #0f172a;
  --clr-text-secondary: #475569;
  --clr-text-tertiary:  #64748b;
  --clr-text-muted:     #94a3b8;
  --clr-text-inverse:   #f1f5f9;

  --clr-border:         rgba(15, 23, 42, 0.1);
  --clr-border-medium:  rgba(15, 23, 42, 0.16);
  --clr-border-strong:  rgba(15, 23, 42, 0.25);

  --shadow-xs:   0 1px 2px rgba(0,0,0,0.06);
  --shadow-sm:   0 2px 8px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md:   0 4px 16px rgba(0,0,0,0.1), 0 2px 6px rgba(0,0,0,0.06);
  --shadow-lg:   0 8px 32px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.08);
  --shadow-xl:   0 20px 60px rgba(0,0,0,0.15), 0 8px 24px rgba(0,0,0,0.1);
  --shadow-glass: 0 8px 32px rgba(0,0,0,0.08), inset 0 1px 0 rgba(255,255,255,0.8);
}

/* ═══════════════════════════════════════════════════════════
   2. CSS RESET & BASE STYLES
   ═══════════════════════════════════════════════════════════ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  font-weight: var(--fw-regular);
  line-height: var(--lh-normal);
  color: var(--clr-text-primary);
  background: var(--clr-bg-primary);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

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

a {
  color: var(--clr-brand-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover { color: var(--clr-brand); }

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
}

ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  line-height: var(--lh-tight);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-primary);
}

:focus-visible {
  outline: 2px solid var(--clr-brand);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

::selection {
  background: var(--clr-brand-alpha);
  color: var(--clr-text-primary);
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--clr-border-strong); border-radius: var(--r-full); }
::-webkit-scrollbar-thumb:hover { background: var(--clr-text-tertiary); }

/* ═══════════════════════════════════════════════════════════
   3. LAYOUT — APP SHELL
   ═══════════════════════════════════════════════════════════ */

.app-shell {
  display: flex;
  min-height: 100vh;
  position: relative;
}

/* --- Sidebar --- */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--clr-bg-secondary);
  border-right: 1px solid var(--clr-border);
  display: flex;
  flex-direction: column;
  z-index: var(--z-sticky);
  transition: width var(--transition-base), transform var(--transition-base);
  overflow: hidden;
}

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

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-5) var(--sp-4);
  height: var(--topbar-height);
  border-bottom: 1px solid var(--clr-border);
  flex-shrink: 0;
  overflow: hidden;
}

.sidebar-logo img {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  border-radius: var(--r-md);
}

.sidebar-logo-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--clr-brand), var(--clr-purple));
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: var(--fw-bold);
  font-size: var(--fs-sm);
  font-family: var(--font-display);
  box-shadow: var(--shadow-brand);
}

.sidebar-logo-text {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  font-size: var(--fs-md);
  background: linear-gradient(135deg, var(--clr-brand-light), var(--clr-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
  transition: opacity var(--transition-base);
}

.sidebar.collapsed .sidebar-logo-text { opacity: 0; pointer-events: none; }

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--sp-3) var(--sp-2);
}

.nav-section {
  margin-bottom: var(--sp-2);
}

.nav-section-label {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--clr-text-muted);
  padding: var(--sp-2) var(--sp-3) var(--sp-1);
  white-space: nowrap;
  transition: opacity var(--transition-base);
}

.sidebar.collapsed .nav-section-label { opacity: 0; }

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-lg);
  color: var(--clr-text-secondary);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.nav-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--clr-brand-alpha), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
  border-radius: inherit;
}

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

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

.nav-link.active {
  color: var(--clr-brand-light);
  background: var(--clr-bg-active);
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  left: 0;
  top: 25%;
  bottom: 25%;
  width: 3px;
  background: linear-gradient(to bottom, var(--clr-brand), var(--clr-purple));
  border-radius: 0 var(--r-full) var(--r-full) 0;
}

.nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  stroke-width: 1.75;
}

.nav-label {
  flex: 1;
  transition: opacity var(--transition-base);
}

.sidebar.collapsed .nav-label { opacity: 0; pointer-events: none; }

.nav-badge {
  background: var(--clr-brand);
  color: white;
  font-size: 10px;
  font-weight: var(--fw-bold);
  padding: 1px 6px;
  border-radius: var(--r-full);
  min-width: 18px;
  text-align: center;
  transition: opacity var(--transition-base);
}

.sidebar.collapsed .nav-badge { opacity: 0; }

.sidebar-footer {
  padding: var(--sp-3) var(--sp-2);
  border-top: 1px solid var(--clr-border);
  flex-shrink: 0;
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--r-lg);
  cursor: pointer;
  transition: background var(--transition-fast);
  overflow: hidden;
}

.sidebar-user:hover { background: var(--clr-bg-hover); }

.sidebar-user-info {
  flex: 1;
  min-width: 0;
  transition: opacity var(--transition-base);
}

.sidebar.collapsed .sidebar-user-info { opacity: 0; pointer-events: none; }

.sidebar-user-name {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-role {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  white-space: nowrap;
}

/* --- Main Content --- */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: margin-left var(--transition-base);
  min-width: 0;
}

.sidebar.collapsed + .main-content {
  margin-left: var(--sidebar-collapsed-width);
}

/* --- Topbar --- */
.topbar {
  height: var(--topbar-height);
  background: var(--clr-bg-secondary);
  border-bottom: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  padding: 0 var(--sp-5);
  gap: var(--sp-4);
  position: sticky;
  top: 0;
  z-index: var(--z-elevated);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.topbar-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-md);
  color: var(--clr-text-secondary);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

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

.topbar-search {
  flex: 1;
  max-width: 480px;
  position: relative;
}

.topbar-search input {
  width: 100%;
  height: 36px;
  background: var(--clr-bg-tertiary);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-lg);
  padding: 0 var(--sp-4) 0 var(--sp-8);
  font-size: var(--fs-sm);
  color: var(--clr-text-primary);
  transition: all var(--transition-fast);
}

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

.topbar-search input:focus {
  outline: none;
  border-color: var(--clr-border-brand);
  background: var(--clr-bg-secondary);
  box-shadow: 0 0 0 3px var(--clr-brand-alpha);
}

.topbar-search-icon {
  position: absolute;
  left: var(--sp-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--clr-text-muted);
  pointer-events: none;
  width: 15px;
  height: 15px;
}

.topbar-search-shortcut {
  position: absolute;
  right: var(--sp-3);
  top: 50%;
  transform: translateY(-50%);
  font-size: 10px;
  color: var(--clr-text-muted);
  background: var(--clr-bg-elevated);
  padding: 2px 6px;
  border-radius: var(--r-sm);
  border: 1px solid var(--clr-border);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  margin-left: auto;
}

.topbar-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-md);
  color: var(--clr-text-secondary);
  transition: all var(--transition-fast);
  position: relative;
}

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

.topbar-btn .badge {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  background: var(--clr-red);
  border-radius: var(--r-full);
  border: 2px solid var(--clr-bg-secondary);
}

.topbar-divider {
  width: 1px;
  height: 20px;
  background: var(--clr-border);
}

/* --- Page Content --- */
.page-content {
  flex: 1;
  padding: var(--sp-6);
  overflow-y: auto;
}

.page-header {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-4);
  margin-bottom: var(--sp-6);
  flex-wrap: wrap;
}

.page-title {
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  color: var(--clr-text-primary);
}

.page-subtitle {
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  margin-top: var(--sp-1);
}

.page-actions {
  display: flex;
  gap: var(--sp-2);
  margin-left: auto;
  flex-wrap: wrap;
}

/* --- App Footer --- */
.app-footer {
  border-top: 1px solid var(--clr-border);
  background: var(--clr-bg-secondary);
  padding: var(--sp-3) var(--sp-6);
  flex-shrink: 0;
}

.app-footer-inner {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
}

.app-footer-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-secondary);
}

.app-footer-sep {
  opacity: 0.4;
}

.app-footer-copy {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.app-footer-author {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: var(--fw-semibold);
  background: linear-gradient(135deg, var(--clr-brand-light), var(--clr-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.app-footer-author:hover {
  opacity: 0.8;
}

.app-footer-author svg {
  color: var(--clr-text-muted);
  -webkit-text-fill-color: initial;
  flex-shrink: 0;
}

.app-footer-version {
  margin-left: auto;
  font-family: var(--font-mono, monospace);
  font-size: 10px;
  background: var(--clr-bg-tertiary);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-full);
  padding: 1px 8px;
  letter-spacing: 0.05em;
}


/* ═══════════════════════════════════════════════════════════
   4. BUTTONS
   ═══════════════════════════════════════════════════════════ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0 var(--sp-4);
  height: 36px;
  border-radius: var(--r-lg);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  font-family: var(--font-sans);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
  text-decoration: none;
  user-select: none;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: white;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:active::after { opacity: 0.08; }

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Primary */
.btn-primary {
  background: linear-gradient(135deg, var(--clr-brand), var(--clr-brand-dark));
  color: white;
  box-shadow: 0 2px 8px rgba(99,102,241,0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--clr-brand-light), var(--clr-brand));
  box-shadow: var(--shadow-brand);
  transform: translateY(-1px);
  color: white;
}

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

/* Secondary */
.btn-secondary {
  background: var(--clr-bg-tertiary);
  color: var(--clr-text-primary);
  border-color: var(--clr-border-medium);
}

.btn-secondary:hover {
  background: var(--clr-bg-elevated);
  border-color: var(--clr-border-strong);
  color: var(--clr-text-primary);
}

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

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

/* Danger */
.btn-danger {
  background: var(--clr-error-bg);
  color: var(--clr-error);
  border-color: rgba(239,68,68,0.3);
}

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

/* Success */
.btn-success {
  background: var(--clr-success-bg);
  color: var(--clr-success);
  border-color: rgba(16,185,129,0.3);
}

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

/* Icon Button */
.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--r-lg);
  flex-shrink: 0;
}

/* Sizes */
.btn-sm { height: 30px; padding: 0 var(--sp-3); font-size: var(--fs-xs); border-radius: var(--r-md); }
.btn-lg { height: 44px; padding: 0 var(--sp-6); font-size: var(--fs-base); border-radius: var(--r-xl); }
.btn-xl { height: 52px; padding: 0 var(--sp-8); font-size: var(--fs-md); border-radius: var(--r-xl); }

/* Loading state */
.btn.loading {
  pointer-events: none;
  opacity: 0.8;
}

.btn.loading::before {
  content: '';
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-right: var(--sp-2);
}

/* ═══════════════════════════════════════════════════════════
   5. FORMS
   ═══════════════════════════════════════════════════════════ */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin-bottom: var(--sp-4);
}

.form-label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-text-secondary);
}

.form-label.required::after {
  content: ' *';
  color: var(--clr-error);
}

.form-control {
  width: 100%;
  height: 40px;
  padding: 0 var(--sp-4);
  background: var(--clr-bg-tertiary);
  border: 1px solid var(--clr-border-medium);
  border-radius: var(--r-lg);
  font-size: var(--fs-sm);
  font-family: var(--font-sans);
  color: var(--clr-text-primary);
  transition: all var(--transition-fast);
}

.form-control::placeholder { color: var(--clr-text-muted); }

.form-control:focus {
  outline: none;
  border-color: var(--clr-border-brand);
  background: var(--clr-bg-secondary);
  box-shadow: 0 0 0 3px var(--clr-brand-alpha);
}

.form-control.error {
  border-color: var(--clr-error);
  box-shadow: 0 0 0 3px rgba(239,68,68,0.2);
}

.form-control.success {
  border-color: var(--clr-success);
  box-shadow: 0 0 0 3px rgba(16,185,129,0.15);
}

textarea.form-control {
  height: auto;
  padding: var(--sp-3) var(--sp-4);
  resize: vertical;
  min-height: 100px;
  line-height: var(--lh-relaxed);
}

select.form-control {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--sp-3) center;
  padding-right: var(--sp-8);
}

.form-hint {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
}

.form-error {
  font-size: var(--fs-xs);
  color: var(--clr-error);
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

/* Input with icon */
.input-group {
  position: relative;
  display: flex;
  align-items: center;
}

.input-group .input-icon {
  position: absolute;
  left: var(--sp-3);
  color: var(--clr-text-muted);
  pointer-events: none;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.input-group .form-control {
  padding-left: calc(var(--sp-3) + 16px + var(--sp-2));
}

.input-group .input-suffix {
  position: absolute;
  right: var(--sp-3);
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
}

.input-group .input-suffix:hover { color: var(--clr-text-secondary); }

/* Toggle / Checkbox */
.toggle-switch {
  position: relative;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.toggle-track {
  position: absolute;
  inset: 0;
  background: var(--clr-border-strong);
  border-radius: var(--r-full);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.toggle-track::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  background: white;
  border-radius: var(--r-full);
  top: 3px;
  left: 3px;
  transition: transform var(--transition-spring);
  box-shadow: var(--shadow-xs);
}

.toggle-switch input:checked + .toggle-track {
  background: var(--clr-brand);
}

.toggle-switch input:checked + .toggle-track::before {
  transform: translateX(18px);
}

/* Checkbox */
.checkbox-group {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  cursor: pointer;
}

.checkbox-input {
  width: 16px;
  height: 16px;
  border-radius: var(--r-sm);
  border: 2px solid var(--clr-border-strong);
  background: var(--clr-bg-tertiary);
  flex-shrink: 0;
  cursor: pointer;
  appearance: none;
  transition: all var(--transition-fast);
  position: relative;
}

.checkbox-input:checked {
  background: var(--clr-brand);
  border-color: var(--clr-brand);
}

.checkbox-input:checked::after {
  content: '';
  position: absolute;
  left: 3px;
  top: 1px;
  width: 6px;
  height: 9px;
  border: 2px solid white;
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
}

/* ═══════════════════════════════════════════════════════════
   6. CARDS & PANELS
   ═══════════════════════════════════════════════════════════ */

.card {
  background: var(--clr-bg-secondary);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-xl);
  padding: var(--sp-5);
  position: relative;
  transition: all var(--transition-fast);
}

.card:hover {
  border-color: var(--clr-border-medium);
  box-shadow: var(--shadow-md);
}

.card-glass {
  background: var(--clr-bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: rgba(255,255,255,0.08);
  box-shadow: var(--shadow-glass);
}

.card-elevated {
  background: var(--clr-bg-elevated);
  box-shadow: var(--shadow-sm);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--clr-border);
}

.card-title {
  font-family: var(--font-display);
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-primary);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.card-body { }

.card-footer {
  margin-top: var(--sp-4);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--clr-border);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

/* Note Card */
.note-card {
  background: var(--clr-bg-secondary);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-2xl);
  padding: var(--sp-5);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.note-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--note-color, var(--clr-brand));
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.note-card:hover {
  border-color: var(--clr-brand-alpha);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px) scale(1.01);
  background: var(--clr-bg-elevated);
}

.note-card:hover::before { opacity: 1; }

.note-card.pinned::before { opacity: 1; }

.note-card-title {
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 700;
  color: var(--clr-text-primary);
  line-height: var(--lh-tight);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.note-card-excerpt {
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  line-height: var(--lh-relaxed);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
  opacity: 0.9;
}

.note-card-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

.note-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2);
}

/* ═══════════════════════════════════════════════════════════
   7. BADGES & TAGS
   ═══════════════════════════════════════════════════════════ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: var(--r-full);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  white-space: nowrap;
}

.badge-brand    { background: var(--clr-brand-alpha); color: var(--clr-brand-light); }
.badge-success  { background: var(--clr-success-bg); color: var(--clr-success); }
.badge-warning  { background: var(--clr-warning-bg); color: var(--clr-amber); }
.badge-error    { background: var(--clr-error-bg); color: var(--clr-error); }
.badge-info     { background: var(--clr-info-bg); color: var(--clr-info); }
.badge-neutral  { background: var(--clr-bg-elevated); color: var(--clr-text-secondary); border: 1px solid var(--clr-border); }

/* Priority badges */
.priority-critical { background: rgba(239,68,68,0.15); color: #ef4444; }
.priority-high     { background: rgba(249,115,22,0.15); color: #f97316; }
.priority-medium   { background: rgba(245,158,11,0.15); color: #f59e0b; }
.priority-low      { background: rgba(16,185,129,0.15); color: #10b981; }
.priority-none     { background: var(--clr-bg-elevated); color: var(--clr-text-muted); border: 1px solid var(--clr-border); }

/* Tag chip */
.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: 3px 10px;
  border-radius: var(--r-full);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  border: 1px solid currentColor;
  opacity: 0.8;
  transition: opacity var(--transition-fast);
  cursor: pointer;
}

.tag-chip:hover { opacity: 1; }

/* ═══════════════════════════════════════════════════════════
   8. METRICS & WIDGETS
   ═══════════════════════════════════════════════════════════ */

.metric-card {
  background: var(--clr-bg-secondary);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-xl);
  padding: var(--sp-5);
  display: flex;
  align-items: flex-start;
  gap: var(--sp-4);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.metric-card::after {
  content: '';
  position: absolute;
  top: -30px;
  right: -30px;
  width: 80px;
  height: 80px;
  background: var(--metric-color, var(--clr-brand));
  border-radius: 50%;
  opacity: 0.06;
}

.metric-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--clr-border-medium);
}

.metric-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--r-lg);
  background: var(--metric-color, var(--clr-brand));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  background: linear-gradient(135deg, var(--metric-color, var(--clr-brand)), var(--metric-color-2, var(--clr-purple)));
}

.metric-content { flex: 1; min-width: 0; }

.metric-label {
  font-size: var(--fs-xs);
  color: var(--clr-text-secondary);
  font-weight: var(--fw-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--sp-1);
}

.metric-value {
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  font-weight: var(--fw-bold);
  color: var(--clr-text-primary);
  line-height: 1;
  margin-bottom: var(--sp-1);
}

.metric-trend {
  font-size: var(--fs-xs);
  display: flex;
  align-items: center;
  gap: 4px;
}

.metric-trend.up   { color: var(--clr-success); }
.metric-trend.down { color: var(--clr-error); }

/* ═══════════════════════════════════════════════════════════
   9. TABLES
   ═══════════════════════════════════════════════════════════ */

.table-container {
  border-radius: var(--r-xl);
  border: 1px solid var(--clr-border);
  overflow: hidden;
  background: var(--clr-bg-secondary);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table thead {
  background: var(--clr-bg-tertiary);
  border-bottom: 1px solid var(--clr-border);
}

.data-table th {
  padding: var(--sp-3) var(--sp-4);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--clr-text-tertiary);
  text-align: left;
  white-space: nowrap;
}

.data-table td {
  padding: var(--sp-3) var(--sp-4);
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  border-bottom: 1px solid var(--clr-border);
  vertical-align: middle;
}

.data-table tbody tr:last-child td { border-bottom: none; }

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: var(--clr-bg-hover);
}

/* ═══════════════════════════════════════════════════════════
   10. MODALS & DIALOGS
   ═══════════════════════════════════════════════════════════ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-4);
  animation: fadeIn var(--transition-fast) ease-out;
}

.modal {
  background: var(--clr-bg-secondary);
  border: 1px solid var(--clr-border-medium);
  border-radius: var(--r-2xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  animation: slideUp var(--transition-base) cubic-bezier(0.16, 1, 0.3, 1);
}

dialog.modal {
  margin: auto;
}

dialog.modal:not([open]) {
  display: none !important;
}

dialog.modal::backdrop {
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: fadeIn var(--transition-fast) ease-out;
}

.modal-lg { max-width: 760px; }
.modal-xl { max-width: 1000px; }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-5) var(--sp-6);
  border-bottom: 1px solid var(--clr-border);
  flex-shrink: 0;
}

.modal-title {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
}

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-6);
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--sp-2);
  padding: var(--sp-4) var(--sp-6);
  border-top: 1px solid var(--clr-border);
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════════════════════
   11. NOTIFICATIONS / TOASTS
   ═══════════════════════════════════════════════════════════ */

.toast-container {
  position: fixed;
  bottom: var(--sp-6);
  right: var(--sp-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: var(--sp-4);
  background: var(--clr-bg-elevated);
  border: 1px solid var(--clr-border-medium);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-xl);
  min-width: 320px;
  max-width: 480px;
  pointer-events: all;
  animation: slideInRight var(--transition-base) cubic-bezier(0.16, 1, 0.3, 1);
  backdrop-filter: blur(12px);
}

.toast.success { border-left: 3px solid var(--clr-success); }
.toast.error   { border-left: 3px solid var(--clr-error); }
.toast.warning { border-left: 3px solid var(--clr-warning); }
.toast.info    { border-left: 3px solid var(--clr-info); }

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 1px;
}

.toast.success .toast-icon { color: var(--clr-success); }
.toast.error   .toast-icon { color: var(--clr-error); }
.toast.warning .toast-icon { color: var(--clr-amber); }
.toast.info    .toast-icon { color: var(--clr-info); }

.toast-content { flex: 1; min-width: 0; }

.toast-title {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-primary);
  margin-bottom: 2px;
}

.toast-body {
  font-size: var(--fs-xs);
  color: var(--clr-text-secondary);
  line-height: var(--lh-relaxed);
}

/* Alert Banners */
.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: var(--sp-4);
  border-radius: var(--r-xl);
  border: 1px solid;
  margin-bottom: var(--sp-4);
}

.alert-success { background: var(--clr-success-bg); border-color: rgba(16,185,129,0.3); color: var(--clr-success); }
.alert-error   { background: var(--clr-error-bg);   border-color: rgba(239,68,68,0.3);  color: var(--clr-error); }
.alert-warning { background: var(--clr-warning-bg); border-color: rgba(245,158,11,0.3); color: var(--clr-amber); }
.alert-info    { background: var(--clr-info-bg);    border-color: rgba(59,130,246,0.3); color: var(--clr-info); }

.alert-text { font-size: var(--fs-sm); font-weight: var(--fw-medium); }

/* ═══════════════════════════════════════════════════════════
   12. AVATAR
   ═══════════════════════════════════════════════════════════ */

.avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--r-full);
  object-fit: cover;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  color: white;
  user-select: none;
  overflow: hidden;
}

.avatar-sm  { width: 28px; height: 28px; font-size: 10px; }
.avatar-md  { width: 36px; height: 36px; }
.avatar-lg  { width: 48px; height: 48px; font-size: var(--fs-base); }
.avatar-xl  { width: 64px; height: 64px; font-size: var(--fs-xl); }
.avatar-2xl { width: 80px; height: 80px; font-size: var(--fs-xl); }

.avatar-group {
  display: flex;
}

.avatar-group .avatar {
  border: 2px solid var(--clr-bg-secondary);
  margin-left: -8px;
}

.avatar-group .avatar:first-child { margin-left: 0; }

/* ═══════════════════════════════════════════════════════════
   13. DROPDOWN MENUS
   ═══════════════════════════════════════════════════════════ */

.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--sp-2));
  right: 0;
  min-width: 200px;
  background: var(--clr-bg-elevated);
  border: 1px solid var(--clr-border-medium);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-popover);
  overflow: hidden;
  animation: slideDown var(--transition-fast) ease-out;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

.dropdown-item.danger { color: var(--clr-error); }
.dropdown-item.danger:hover { background: var(--clr-error-bg); }

.dropdown-divider {
  height: 1px;
  background: var(--clr-border);
  margin: var(--sp-1) 0;
}

/* ═══════════════════════════════════════════════════════════
   14. PROGRESS INDICATORS
   ═══════════════════════════════════════════════════════════ */

.progress-bar {
  height: 4px;
  background: var(--clr-bg-tertiary);
  border-radius: var(--r-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--clr-brand), var(--clr-purple));
  border-radius: var(--r-full);
  transition: width var(--transition-slow);
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 40px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3));
  animation: shimmer 1.5s ease-in-out infinite;
}

/* ═══════════════════════════════════════════════════════════
   15. KANBAN BOARD
   ═══════════════════════════════════════════════════════════ */

.kanban-board {
  display: flex;
  gap: var(--sp-4);
  overflow-x: auto;
  padding-bottom: var(--sp-4);
  min-height: calc(100vh - 180px);
  align-items: flex-start;
}

.kanban-list {
  flex-shrink: 0;
  width: 300px;
  background: var(--clr-bg-tertiary);
  border-radius: var(--r-xl);
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 200px);
}

.kanban-list-header {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--clr-border);
  flex-shrink: 0;
}

.kanban-list-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--r-full);
  flex-shrink: 0;
}

.kanban-list-title {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  flex: 1;
}

.kanban-list-count {
  font-size: var(--fs-xs);
  color: var(--clr-text-muted);
  background: var(--clr-bg-elevated);
  padding: 2px 8px;
  border-radius: var(--r-full);
}

.kanban-cards {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-3);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  min-height: 60px;
}

.kanban-card {
  background: var(--clr-bg-secondary);
  border: 1px solid var(--clr-border);
  border-radius: var(--r-lg);
  padding: var(--sp-3);
  cursor: grab;
  transition: all var(--transition-fast);
  position: relative;
}

.kanban-card:active { cursor: grabbing; }

.kanban-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--clr-border-medium);
  transform: translateY(-1px);
}

.kanban-card.dragging {
  opacity: 0.5;
  cursor: grabbing;
  transform: rotate(2deg) scale(1.02);
  box-shadow: var(--shadow-xl);
}

.kanban-card-title {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--clr-text-primary);
  margin-bottom: var(--sp-2);
  line-height: var(--lh-snug);
}

.kanban-card-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

/* ═══════════════════════════════════════════════════════════
   16. AUTH LAYOUT
   ═══════════════════════════════════════════════════════════ */

.auth-layout {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-bg-primary);
  position: relative;
  padding: var(--sp-4);
  overflow: hidden;
}

.auth-bg-gradient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.auth-bg-gradient::before {
  content: '';
  position: absolute;
  top: -30%;
  left: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(ellipse, rgba(99,102,241,0.15) 0%, transparent 70%);
  filter: blur(60px);
}

.auth-bg-gradient::after {
  content: '';
  position: absolute;
  bottom: -20%;
  right: -15%;
  width: 50%;
  height: 50%;
  background: radial-gradient(ellipse, rgba(139,92,246,0.12) 0%, transparent 70%);
  filter: blur(60px);
}

.auth-card {
  background: var(--clr-bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--clr-border-medium);
  border-radius: var(--r-3xl);
  padding: var(--sp-10) var(--sp-8);
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-xl), var(--shadow-glass);
  position: relative;
  z-index: 1;
  animation: slideUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.auth-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-8);
}

.auth-logo-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--clr-brand), var(--clr-purple));
  border-radius: var(--r-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-brand);
}

.auth-logo-text {
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  font-weight: var(--fw-bold);
  background: linear-gradient(135deg, var(--clr-brand-light), var(--clr-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-heading {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  text-align: center;
  margin-bottom: var(--sp-2);
}

.auth-subheading {
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  text-align: center;
  margin-bottom: var(--sp-8);
}

.auth-form { display: flex; flex-direction: column; gap: var(--sp-4); }

.auth-footer {
  text-align: center;
  margin-top: var(--sp-6);
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
}

/* ═══════════════════════════════════════════════════════════
   17. EMPTY STATES
   ═══════════════════════════════════════════════════════════ */

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--sp-16) var(--sp-8);
  text-align: center;
  gap: var(--sp-4);
}

.empty-state-icon {
  width: 80px;
  height: 80px;
  background: var(--clr-bg-tertiary);
  border-radius: var(--r-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-text-muted);
  margin-bottom: var(--sp-2);
}

.empty-state-title {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  color: var(--clr-text-primary);
}

.empty-state-body {
  font-size: var(--fs-sm);
  color: var(--clr-text-secondary);
  max-width: 360px;
  line-height: var(--lh-relaxed);
}

/* ═══════════════════════════════════════════════════════════
   18. SKELETON LOADERS
   ═══════════════════════════════════════════════════════════ */

.skeleton {
  background: linear-gradient(90deg, var(--clr-bg-tertiary) 25%, var(--clr-bg-elevated) 50%, var(--clr-bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: skeletonPulse 1.5s ease-in-out infinite;
  border-radius: var(--r-md);
}

/* ═══════════════════════════════════════════════════════════
   19. GRID SYSTEM
   ═══════════════════════════════════════════════════════════ */

.grid { display: grid; gap: var(--sp-4); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.grid-notes { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }

/* ═══════════════════════════════════════════════════════════
   20. ANIMATIONS
   ═══════════════════════════════════════════════════════════ */

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

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

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

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

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

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

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

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

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-6px); }
}

/* ═══════════════════════════════════════════════════════════
   21. UTILITY CLASSES
   ═══════════════════════════════════════════════════════════ */

/* Display */
.d-none     { display: none !important; }
.d-flex     { display: flex; }
.d-grid     { display: grid; }
.d-block    { display: block; }
.d-inline   { display: inline; }

/* Flex */
.flex-1     { flex: 1; }
.flex-col   { flex-direction: column; }
.flex-wrap  { flex-wrap: wrap; }
.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(--sp-1); }
.gap-2 { gap: var(--sp-2); }
.gap-3 { gap: var(--sp-3); }
.gap-4 { gap: var(--sp-4); }

/* Text */
.text-xs      { font-size: var(--fs-xs); }
.text-sm      { font-size: var(--fs-sm); }
.text-base    { font-size: var(--fs-base); }
.text-lg      { font-size: var(--fs-lg); }
.text-xl      { font-size: var(--fs-xl); }
.text-center  { text-align: center; }
.text-right   { text-align: right; }
.text-primary { color: var(--clr-text-primary); }
.text-secondary { color: var(--clr-text-secondary); }
.text-muted   { color: var(--clr-text-muted); }
.text-brand   { color: var(--clr-brand-light); }
.text-success { color: var(--clr-success); }
.text-error   { color: var(--clr-error); }
.text-warning { color: var(--clr-amber); }
.fw-medium    { font-weight: var(--fw-medium); }
.fw-semibold  { font-weight: var(--fw-semibold); }
.fw-bold      { font-weight: var(--fw-bold); }
.truncate     { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Spacing */
.m-0 { margin: 0; }
.mt-1 { margin-top: var(--sp-1); }
.mt-2 { margin-top: var(--sp-2); }
.mt-4 { margin-top: var(--sp-4); }
.mb-2 { margin-bottom: var(--sp-2); }
.mb-4 { margin-bottom: var(--sp-4); }
.mb-6 { margin-bottom: var(--sp-6); }
.p-4  { padding: var(--sp-4); }
.p-5  { padding: var(--sp-5); }

/* Width/Height */
.w-full  { width: 100%; }
.h-full  { height: 100%; }
.min-w-0 { min-width: 0; }

/* Border */
.rounded    { border-radius: var(--r-md); }
.rounded-lg { border-radius: var(--r-lg); }
.rounded-xl { border-radius: var(--r-xl); }
.rounded-full { border-radius: var(--r-full); }

/* Misc */
.overflow-hidden { overflow: hidden; }
.cursor-pointer  { cursor: pointer; }
.select-none     { user-select: none; }
.opacity-0       { opacity: 0; }
.opacity-50      { opacity: 0.5; }
.relative        { position: relative; }
.absolute        { position: absolute; }
.fixed           { position: fixed; }

/* ═══════════════════════════════════════════════════════════
   22. RESPONSIVE BREAKPOINTS
   ═══════════════════════════════════════════════════════════ */

/* Tablet (768px) */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: var(--sidebar-width) !important;
  }

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

  .main-content {
    margin-left: 0 !important;
  }

  .page-content { padding: var(--sp-4); }

  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }

  .auth-card {
    padding: var(--sp-8) var(--sp-5);
    border-radius: var(--r-2xl);
  }

  .kanban-board { align-items: stretch; }
}

/* Mobile (480px) */
@media (max-width: 480px) {
  .page-header { flex-direction: column; align-items: flex-start; }
  .page-actions { width: 100%; }
  .btn-xl { height: 44px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .metric-card { flex-direction: column; }
  .topbar-search { display: none; }
  .modal { border-radius: var(--r-xl); }
  .auth-card { padding: var(--sp-6) var(--sp-4); }
}

/* Mobile Overlay for Sidebar */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: calc(var(--z-sticky) - 1);
  display: none;
  backdrop-filter: blur(2px);
}

.sidebar-overlay.active { display: block; }