/* ==========================================================================
   BASE DESIGN SYSTEM: Files/base.css
   PURPOSE: Inverted High-Contrast Wireframe Theme System.
   Dark Mode = White Lines/Frames on Black | White Mode = Pitch-Black Frames on White.
   Strictly under 200 lines in compliance with project rules.
   ========================================================================== */

:root,
[data-theme="dark"] {
  --font-sans: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-mono: 'Fira Mono', 'JetBrains Mono', monospace;

  /* Architectural Blueprint: Black Canvas + Crisp White Outlines */
  --bg-canvas: #040508;
  --bg-dark: #040508;
  --surface: rgba(12, 16, 24, 0.88);
  --surface-alt: rgba(20, 26, 38, 0.92);
  --surface-hover: rgba(32, 42, 60, 0.98);
  --surface-opaque: #0A0D14;

  /* White Frames, Lines & Outlines */
  --frame-border: rgba(255, 255, 255, 0.50);
  --frame-border-active: #FFFFFF;
  --border: rgba(255, 255, 255, 0.22);
  --border-light: rgba(255, 255, 255, 0.55);
  --border-focus: #FFFFFF;

  --accent: #FFFFFF;
  --accent-2: #E2E8F0;
  --accent-3: #94A3B8;
  --accent-glow: rgba(255, 255, 255, 0.20);

  --danger: #ef4444;
  --danger-glow: rgba(239, 68, 68, 0.25);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.25);
  --warning: #f59e0b;

  --text-main: #FFFFFF;
  --text-muted: #A3A3A3;
  --text-dim: #737373;

  --bubble-user-bg: #141824;
  --bubble-user-border: #FFFFFF;
  --bubble-user-text: #FFFFFF;
  --bubble-bot-bg: #0C1018;
  --bubble-bot-border: rgba(255, 255, 255, 0.40);

  --splitter-pin: rgba(255, 255, 255, 0.60);
  --splitter-active: #FFFFFF;
  --scrollbar-thumb: rgba(255, 255, 255, 0.25);
  --scrollbar-hover: #FFFFFF;
  --island-shadow: 0 16px 44px rgba(0, 0, 0, 0.50);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-elastic: cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="light"] {
  --font-sans: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-mono: 'Fira Mono', 'JetBrains Mono', monospace;

  /* Editorial Print: Pure White Canvas + Pitch-Black Frames & Lines */
  --bg-canvas: #FFFFFF;
  --bg-dark: #FFFFFF;
  --surface: #FFFFFF;
  --surface-alt: #F8FAFC;
  --surface-hover: #F1F5F9;
  --surface-opaque: #FFFFFF;

  /* Pitch-Black Frames, Lines & Outlines */
  --frame-border: #000000;
  --frame-border-active: #000000;
  --border: rgba(0, 0, 0, 0.35);
  --border-light: #000000;
  --border-focus: #000000;

  --accent: #000000;
  --accent-2: #1E293B;
  --accent-3: #475569;
  --accent-glow: rgba(0, 0, 0, 0.15);

  --danger: #dc2626;
  --danger-glow: rgba(220, 38, 38, 0.20);
  --success: #059669;
  --success-glow: rgba(5, 150, 105, 0.20);
  --warning: #d97706;

  --text-main: #000000;
  --text-muted: #334155;
  --text-dim: #64748B;

  --bubble-user-bg: #000000;
  --bubble-user-border: #000000;
  --bubble-user-text: #FFFFFF;
  --bubble-bot-bg: #FFFFFF;
  --bubble-bot-border: #000000;

  --splitter-pin: #000000;
  --splitter-active: #000000;
  --scrollbar-thumb: rgba(0, 0, 0, 0.40);
  --scrollbar-hover: #000000;
  --island-shadow: 0 10px 28px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-canvas);
  color: var(--text-main);
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.20s ease, color 0.20s ease;
}

/* Minimalist Scrollbars */
* { scrollbar-width: thin; scrollbar-color: var(--scrollbar-thumb) transparent; }
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-hover); }
::-webkit-scrollbar-button { display: none !important; width: 0 !important; height: 0 !important; }

/* Subtle Monochrome Ambient Glow */
.ambient-canvas { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; opacity: 0.12; }
.glow-orb { position: absolute; border-radius: 50%; filter: blur(140px); background: radial-gradient(circle, var(--text-muted) 0%, transparent 70%); }
.orb-1 { width: 600px; height: 600px; top: -140px; left: -90px; }
.orb-2 { width: 650px; height: 650px; bottom: -160px; right: -100px; }
.orb-3 { width: 450px; height: 450px; top: 40%; left: 35%; }

/* Buttons & Elements */
.btn-circle {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--accent);
  border: 1px solid var(--border-light);
  color: var(--bg-dark);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; box-shadow: 0 4px 14px var(--accent-glow);
  transition: transform 0.2s var(--ease);
}
.btn-circle:hover { transform: scale(1.08); }
.btn-circle:active { transform: scale(0.94); }

.icon-btn {
  background: transparent; border: none; color: var(--text-main); cursor: pointer;
  border-radius: 10px; width: 34px; height: 34px; display: flex; align-items: center;
  justify-content: center; transition: background 0.15s ease;
}
.icon-btn:hover { background: var(--surface-alt); }

.btn-gradient {
  background: var(--accent); color: var(--bg-dark);
  border: 1px solid var(--border-light); border-radius: 12px; padding: 8px 16px;
  font-weight: 700; font-size: 12px; cursor: pointer; display: inline-flex; align-items: center; gap: 6px;
  box-shadow: 0 4px 14px var(--accent-glow); transition: transform 0.15s var(--ease);
}
.btn-gradient:hover { transform: translateY(-1px); }
.btn-gradient:active { transform: scale(0.96); }
.btn-ghost { background: transparent; border: none; color: var(--text-muted); cursor: pointer; padding: 6px 12px; border-radius: 8px; }

.badge { font-size: 10px; font-weight: 700; padding: 3px 8px; border-radius: 8px; }
.badge.active { background: var(--surface-alt); border: 1px solid var(--border-light); color: var(--text-main); }
.badge.due { background: var(--danger-glow); color: var(--danger); border: 1px solid var(--danger); }
.badge.neutral { background: var(--surface-alt); color: var(--text-dim); }

.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.65); backdrop-filter: blur(16px); display: flex; align-items: center; justify-content: center; z-index: 99999; }
.modal-card { width: 92%; max-width: 580px; background: var(--surface-opaque); border: 1.5px solid var(--frame-border); border-radius: 28px; padding: 24px; max-height: 90vh; overflow-y: auto; box-shadow: var(--island-shadow); }
.hidden { display: none !important; }