/* ============================================
   KNOWSTACK - DESIGN TOKENS
   A glassmorphism design system inspired by
   soft gradients and frosted glass aesthetics
   ============================================ */

/* Google Fonts Import - Plus Jakarta Sans for refined, modern feel */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400;1,500&display=swap');

/* ============================================
   LIGHT THEME (Default)
   ============================================ */
:root {
  /* === COLOR PALETTE === */

  /* Primary - Sophisticated slate-blue */
  --color-primary-50: #f0f4f8;
  --color-primary-100: #d9e2ec;
  --color-primary-200: #bcccdc;
  --color-primary-300: #9fb3c8;
  --color-primary-400: #829ab1;
  --color-primary-500: #627d98;
  --color-primary-600: #486581;
  --color-primary-700: #334e68;
  --color-primary-800: #243b53;
  --color-primary-900: #102a43;

  /* Accent - Refined teal (primary brand color) */
  --color-accent-50: #e6fffa;
  --color-accent-100: #b2f5ea;
  --color-accent-200: #81e6d9;
  --color-accent-300: #4fd1c5;
  --color-accent-400: #38b2ac;
  --color-accent-500: #319795;
  --color-accent-600: #2c7a7b;
  --color-accent-700: #285e61;
  --color-accent-800: #234e52;
  --color-accent-900: #1d4044;

  /* Brand colors - teal-only palette */
  --color-brand-start: var(--color-accent-300);
  --color-brand-mid: var(--color-accent-400);
  --color-brand-end: var(--color-accent-500);
  --color-brand-accent: var(--color-accent-600);
  --color-brand-light: var(--color-accent-200);

  /* Neutrals - Warm gray scale */
  --color-neutral-0: #ffffff;
  --color-neutral-50: #f9fafb;
  --color-neutral-100: #f3f4f6;
  --color-neutral-200: #e5e7eb;
  --color-neutral-300: #d1d5db;
  --color-neutral-400: #9ca3af;
  --color-neutral-500: #6b7280;
  --color-neutral-600: #4b5563;
  --color-neutral-700: #374151;
  --color-neutral-800: #1f2937;
  --color-neutral-900: #111827;
  --color-neutral-950: #030712;

  /* Semantic Colors */
  --color-success-light: #d1fae5;
  --color-success-base: #10b981;
  --color-success-dark: #059669;

  --color-warning-light: #fef3c7;
  --color-warning-base: #f59e0b;
  --color-warning-dark: #d97706;

  --color-error-light: #fee2e2;
  --color-error-base: #ef4444;
  --color-error-dark: #dc2626;

  --color-info-light: #dbeafe;
  --color-info-base: #3b82f6;
  --color-info-dark: #2563eb;

  /* === SEMANTIC ALIASES === */

  /* Background */
  --bg-base: transparent;
  --bg-surface: rgba(255, 255, 255, 0.5);
  --bg-surface-solid: rgba(255, 255, 255, 0.85);
  --bg-elevated: rgba(255, 255, 255, 0.7);
  --bg-overlay: rgba(255, 255, 255, 0.9);
  --bg-muted: rgba(255, 255, 255, 0.3);
  --bg-inverse: var(--color-neutral-900);

  /* Text */
  --text-primary: var(--color-neutral-900);
  --text-secondary: var(--color-neutral-600);
  --text-tertiary: var(--color-neutral-500);
  --text-muted: var(--color-neutral-400);
  --text-inverse: var(--color-neutral-0);
  --text-accent: var(--color-accent-600);
  --text-link: var(--color-primary-600);
  --text-link-hover: var(--color-primary-700);

  /* Border */
  --border-default: rgba(255, 255, 255, 0.5);
  --border-subtle: rgba(255, 255, 255, 0.3);
  --border-strong: rgba(255, 255, 255, 0.7);
  --border-focus: var(--color-accent-400);
  --border-error: var(--color-error-base);

  /* Interactive States */
  --state-hover: rgba(0, 0, 0, 0.04);
  --state-active: rgba(0, 0, 0, 0.08);
  --state-selected: rgba(49, 151, 149, 0.1);
  --state-disabled: var(--color-neutral-100);

  /* === GLASSMORPHISM === */
  --glass-bg: rgba(255, 255, 255, 0.30);
  --glass-bg-strong: rgba(255, 255, 255, 0.50);
  --glass-bg-subtle: rgba(255, 255, 255, 0.20);
  --glass-border: rgba(255, 255, 255, 0.6);
  --glass-border-subtle: rgba(255, 255, 255, 0.4);
  --glass-blur: blur(32px);
  --glass-blur-strong: blur(40px);
  --glass-blur-subtle: blur(16px);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);

  /* === COMPONENT TOKENS === */

  /* Input fields */
  --input-bg: rgba(255, 255, 255, 0.50);
  --input-bg-focus: rgba(255, 255, 255, 0.70);

  /* Tab navigation */
  --tab-bg: rgba(255, 255, 255, 0.40);
  --tab-active-bg: rgba(255, 255, 255, 1);

  /* Dropdown menus */
  --dropdown-bg: rgba(255, 255, 255, 0.95);

  /* Tables */
  --table-row-hover: rgba(255, 255, 255, 0.50);
  --table-border: var(--color-neutral-200);

  /* Empty state icons */
  --empty-icon-bg: var(--color-neutral-200);
  --empty-icon-color: var(--color-neutral-500);

  /* Loading spinner */
  --spinner-track: rgba(56, 178, 172, 0.3);
  --spinner-fill: var(--color-accent-500);

  /* Toast notifications */
  --toast-success-bg: #f0fdf4;
  --toast-success-border: #bbf7d0;
  --toast-success-text: #14532d;
  --toast-success-icon: #16a34a;

  --toast-error-bg: #fef2f2;
  --toast-error-border: #fecaca;
  --toast-error-text: #7f1d1d;
  --toast-error-icon: #dc2626;

  --toast-warning-bg: #fffbeb;
  --toast-warning-border: #fde68a;
  --toast-warning-text: #78350f;
  --toast-warning-icon: #d97706;

  --toast-info-bg: #eff6ff;
  --toast-info-border: #bfdbfe;
  --toast-info-text: #1e3a5a;
  --toast-info-icon: #2563eb;

  /* Gradient Background (for page backdrop) - teal-only aesthetic */
  --gradient-mesh:
    radial-gradient(ellipse at 10% 0%, rgba(79, 209, 197, 0.35) 0%, transparent 50%),
    radial-gradient(ellipse at 90% 10%, rgba(56, 178, 172, 0.30) 0%, transparent 45%),
    radial-gradient(ellipse at 100% 100%, rgba(129, 230, 217, 0.40) 0%, transparent 50%),
    radial-gradient(ellipse at 0% 100%, rgba(49, 151, 149, 0.35) 0%, transparent 50%),
    linear-gradient(135deg, #e6f5f3 0%, #d4e8e6 30%, #ccdeda 60%, #d8e6e3 100%);

  /* === TYPOGRAPHY === */
  --font-family-base: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */
  --text-6xl: 3.75rem;     /* 60px */

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

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* Letter Spacing */
  --tracking-tighter: -0.05em;
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.05em;

  /* === SPACING SCALE (4px base) === */
  --space-0: 0;
  --space-px: 1px;
  --space-0-5: 0.125rem;   /* 2px */
  --space-1: 0.25rem;      /* 4px */
  --space-1-5: 0.375rem;   /* 6px */
  --space-2: 0.5rem;       /* 8px */
  --space-2-5: 0.625rem;   /* 10px */
  --space-3: 0.75rem;      /* 12px */
  --space-3-5: 0.875rem;   /* 14px */
  --space-4: 1rem;         /* 16px */
  --space-5: 1.25rem;      /* 20px */
  --space-6: 1.5rem;       /* 24px */
  --space-7: 1.75rem;      /* 28px */
  --space-8: 2rem;         /* 32px */
  --space-9: 2.25rem;      /* 36px */
  --space-10: 2.5rem;      /* 40px */
  --space-11: 2.75rem;     /* 44px */
  --space-12: 3rem;        /* 48px */
  --space-14: 3.5rem;      /* 56px */
  --space-16: 4rem;        /* 64px */
  --space-20: 5rem;        /* 80px */
  --space-24: 6rem;        /* 96px */
  --space-28: 7rem;        /* 112px */
  --space-32: 8rem;        /* 128px */

  /* === BORDER RADIUS === */
  --radius-none: 0;
  --radius-sm: 0.375rem;   /* 6px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-2xl: 1.25rem;   /* 20px */
  --radius-3xl: 1.5rem;    /* 24px */
  --radius-4xl: 2rem;      /* 32px */
  --radius-full: 9999px;

  /* === SHADOWS === */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.04), 0 2px 4px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.06), 0 4px 8px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.08), 0 8px 16px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 24px 48px rgba(0, 0, 0, 0.1), 0 12px 24px rgba(0, 0, 0, 0.05);

  /* Glass shadows (softer, more diffused) */
  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.06);
  --shadow-glass-lg: 0 16px 48px rgba(0, 0, 0, 0.08);

  /* Colored shadows */
  --shadow-accent: 0 4px 14px rgba(49, 151, 149, 0.25);
  --shadow-primary: 0 4px 14px rgba(72, 101, 129, 0.2);

  /* Inner shadows */
  --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-inner-lg: inset 0 4px 8px rgba(0, 0, 0, 0.06);

  /* === TRANSITIONS === */
  --duration-instant: 50ms;
  --duration-fast: 100ms;
  --duration-normal: 200ms;
  --duration-slow: 300ms;
  --duration-slower: 500ms;

  --ease-linear: linear;
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.25, 0.1, 0.25, 1);

  --transition-colors: color var(--duration-normal) var(--ease-in-out),
                       background-color var(--duration-normal) var(--ease-in-out),
                       border-color var(--duration-normal) var(--ease-in-out);
  --transition-transform: transform var(--duration-normal) var(--ease-out);
  --transition-shadow: box-shadow var(--duration-normal) var(--ease-in-out);
  --transition-all: all var(--duration-normal) var(--ease-in-out);

  /* === Z-INDEX SCALE === */
  --z-below: -1;
  --z-base: 0;
  --z-above: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-header: 300;
  --z-overlay: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-toast: 700;
  --z-tooltip: 800;
  --z-max: 9999;

  /* === SIZING === */
  --size-icon-xs: 1rem;      /* 16px */
  --size-icon-sm: 1.25rem;   /* 20px */
  --size-icon-md: 1.5rem;    /* 24px */
  --size-icon-lg: 2rem;      /* 32px */
  --size-icon-xl: 2.5rem;    /* 40px */

  --size-avatar-xs: 1.5rem;  /* 24px */
  --size-avatar-sm: 2rem;    /* 32px */
  --size-avatar-md: 2.5rem;  /* 40px */
  --size-avatar-lg: 3rem;    /* 48px */
  --size-avatar-xl: 4rem;    /* 64px */

  /* === CONTAINER WIDTHS === */
  --container-xs: 20rem;     /* 320px */
  --container-sm: 24rem;     /* 384px */
  --container-md: 28rem;     /* 448px */
  --container-lg: 32rem;     /* 512px */
  --container-xl: 36rem;     /* 576px */
  --container-2xl: 42rem;    /* 672px */
  --container-3xl: 48rem;    /* 768px */
  --container-4xl: 56rem;    /* 896px */
  --container-5xl: 64rem;    /* 1024px */
  --container-6xl: 72rem;    /* 1152px */
  --container-7xl: 80rem;    /* 1280px */
}

/* ============================================
   DARK THEME
   ============================================ */
[data-theme="dark"] {
  /* === SEMANTIC ALIASES (Dark overrides) === */

  /* Background */
  --bg-base: var(--color-neutral-950);
  --bg-surface: rgba(30, 41, 59, 0.7);
  --bg-surface-solid: var(--color-neutral-900);
  --bg-elevated: rgba(30, 41, 59, 0.85);
  --bg-overlay: rgba(30, 41, 59, 0.95);
  --bg-muted: var(--color-neutral-900);
  --bg-inverse: var(--color-neutral-0);

  /* Text */
  --text-primary: var(--color-neutral-50);
  --text-secondary: var(--color-neutral-300);
  --text-tertiary: var(--color-neutral-400);
  --text-muted: var(--color-neutral-500);
  --text-inverse: var(--color-neutral-900);
  --text-accent: var(--color-accent-400);
  --text-link: var(--color-primary-400);
  --text-link-hover: var(--color-primary-300);

  /* Border */
  --border-default: rgba(255, 255, 255, 0.08);
  --border-subtle: rgba(255, 255, 255, 0.04);
  --border-strong: rgba(255, 255, 255, 0.12);
  --border-focus: var(--color-accent-400);

  /* Interactive States */
  --state-hover: rgba(255, 255, 255, 0.06);
  --state-active: rgba(255, 255, 255, 0.1);
  --state-selected: rgba(79, 209, 197, 0.15);
  --state-disabled: var(--color-neutral-800);

  /* === GLASSMORPHISM (Dark) === */
  --glass-bg: rgba(30, 41, 59, 0.30);
  --glass-bg-strong: rgba(30, 41, 59, 0.50);
  --glass-bg-subtle: rgba(30, 41, 59, 0.20);
  --glass-border: rgba(255, 255, 255, 0.10);
  --glass-border-subtle: rgba(255, 255, 255, 0.06);

  /* === COMPONENT TOKENS (Dark) === */

  /* Input fields */
  --input-bg: rgba(30, 41, 59, 0.50);
  --input-bg-focus: rgba(30, 41, 59, 0.70);

  /* Tab navigation */
  --tab-bg: rgba(30, 41, 59, 0.40);
  --tab-active-bg: rgba(255, 255, 255, 0.10);

  /* Dropdown menus */
  --dropdown-bg: rgba(30, 41, 59, 0.95);

  /* Tables */
  --table-row-hover: rgba(255, 255, 255, 0.05);
  --table-border: rgba(51, 65, 85, 0.50);

  /* Empty state icons */
  --empty-icon-bg: rgba(29, 64, 68, 0.4);
  --empty-icon-color: var(--color-neutral-500);

  /* Loading spinner */
  --spinner-track: rgba(79, 209, 197, 0.25);
  --spinner-fill: var(--color-accent-400);

  /* Toast notifications */
  --toast-success-bg: #14532d;
  --toast-success-border: #166534;
  --toast-success-text: #dcfce7;
  --toast-success-icon: #4ade80;

  --toast-error-bg: #7f1d1d;
  --toast-error-border: #991b1b;
  --toast-error-text: #fee2e2;
  --toast-error-icon: #f87171;

  --toast-warning-bg: #78350f;
  --toast-warning-border: #92400e;
  --toast-warning-text: #fef3c7;
  --toast-warning-icon: #fbbf24;

  --toast-info-bg: #1e3a5a;
  --toast-info-border: #1e40af;
  --toast-info-text: #dbeafe;
  --toast-info-icon: #60a5fa;

  /* Gradient Background (Dark) - teal-only aesthetic */
  --gradient-mesh:
    radial-gradient(at 20% 20%, rgba(56, 178, 172, 0.18) 0%, transparent 50%),
    radial-gradient(at 80% 20%, rgba(79, 209, 197, 0.12) 0%, transparent 50%),
    radial-gradient(at 40% 80%, rgba(49, 151, 149, 0.15) 0%, transparent 50%),
    radial-gradient(at 90% 80%, rgba(129, 230, 217, 0.10) 0%, transparent 50%),
    linear-gradient(180deg, var(--color-neutral-950) 0%, var(--color-neutral-900) 100%);

  /* === SHADOWS (Dark - more subtle) === */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2), 0 1px 2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.2), 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.25), 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.3), 0 8px 16px rgba(0, 0, 0, 0.2);
  --shadow-2xl: 0 24px 48px rgba(0, 0, 0, 0.35), 0 12px 24px rgba(0, 0, 0, 0.25);

  --shadow-glass: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glass-lg: 0 16px 48px rgba(0, 0, 0, 0.4);

  /* Glow effects for dark mode */
  --shadow-accent: 0 4px 20px rgba(79, 209, 197, 0.3);
  --shadow-primary: 0 4px 20px rgba(130, 154, 177, 0.2);

  --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-inner-lg: inset 0 4px 8px rgba(0, 0, 0, 0.3);
}

/* ============================================
   BASE STYLES
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-family: var(--font-family-base);
  font-size: 16px;
  line-height: var(--leading-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  background: var(--gradient-mesh);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
}

/* Smooth theme transitions */
body,
body * {
  transition: background-color var(--duration-slow) var(--ease-smooth),
              border-color var(--duration-slow) var(--ease-smooth),
              color var(--duration-slow) var(--ease-smooth);
}

/* Selection styling */
::selection {
  background: var(--color-accent-200);
  color: var(--color-accent-900);
}

[data-theme="dark"] ::selection {
  background: var(--color-accent-700);
  color: var(--color-accent-100);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-neutral-300);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-neutral-400);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: var(--color-neutral-700);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: var(--color-neutral-600);
}

/* Focus visible styling */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}