:root {
  /* Primitive Color Tokens */
  --color-white: rgba(255, 255, 255, 1);
  --color-black: rgba(0, 0, 0, 1);
  --color-cream-50: rgba(252, 252, 249, 1);
  --color-cream-100: rgba(255, 255, 253, 1);
  --color-gray-200: rgba(245, 245, 245, 1);
  --color-gray-300: rgba(167, 169, 169, 1);
  --color-gray-400: rgba(119, 124, 124, 1);
  --color-slate-500: rgba(98, 108, 113, 1);
  --color-brown-600: rgba(94, 82, 64, 1);
  --color-charcoal-700: rgba(31, 33, 33, 1);
  --color-charcoal-800: rgba(38, 40, 40, 1);
  --color-slate-900: rgba(19, 52, 59, 1);
  --color-teal-300: rgba(50, 184, 198, 1);
  --color-teal-400: rgba(45, 166, 178, 1);
  --color-teal-500: rgba(33, 128, 141, 1);
  --color-teal-600: rgba(29, 116, 128, 1);
  --color-teal-700: rgba(26, 104, 115, 1);
  --color-teal-800: rgba(41, 150, 161, 1);
  --color-red-400: rgba(255, 84, 89, 1);
  --color-red-500: rgba(192, 21, 47, 1);
  --color-orange-400: rgba(230, 129, 97, 1);
  --color-orange-500: rgba(168, 75, 47, 1);

  /* RGB versions for opacity control */
  --color-brown-600-rgb: 94, 82, 64;
  --color-teal-500-rgb: 33, 128, 141;
  --color-slate-900-rgb: 19, 52, 59;
  --color-slate-500-rgb: 98, 108, 113;
  --color-red-500-rgb: 192, 21, 47;
  --color-red-400-rgb: 255, 84, 89;
  --color-orange-500-rgb: 168, 75, 47;
  --color-orange-400-rgb: 230, 129, 97;

  /* Background color tokens (Light Mode) */
  --color-bg-1: rgba(59, 130, 246, 0.08); /* Light blue */
  --color-bg-2: rgba(245, 158, 11, 0.08); /* Light yellow */
  --color-bg-3: rgba(34, 197, 94, 0.08); /* Light green */

  /* Semantic Color Tokens (Light Mode) */
  --color-background: var(--color-cream-50);
  --color-surface: var(--color-cream-100);
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-500);
  --color-primary: var(--color-teal-500);
  --color-primary-hover: var(--color-teal-600);
  --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
  --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
  --color-border: rgba(var(--color-brown-600-rgb), 0.2);
  --color-btn-primary-text: var(--color-cream-50);
  --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
  --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
  --color-error: var(--color-red-500);
  --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);

  /* RGB versions for opacity control */
  --color-error-rgb: 192, 21, 47;

  /* Typography */
  --font-family-base: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-weight-medium: 500;
  --font-weight-semibold: 550;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --letter-spacing-tight: -0.01em;

  /* Spacing */
  --space-4: 4px;
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-base: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04), 0 4px 6px -2px rgba(0, 0, 0, 0.02);

  /* Animation */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root {
    --color-gray-400-rgb: 119, 124, 124;
    --color-teal-300-rgb: 50, 184, 198;
    --color-gray-300-rgb: 167, 169, 169;
    --color-background: var(--color-charcoal-700);
    --color-surface: var(--color-charcoal-800);
    --color-text: var(--color-gray-200);
    --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
    --color-primary: var(--color-teal-300);
    --color-primary-hover: var(--color-teal-400);
    --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
    --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
    --color-border: rgba(var(--color-gray-400-rgb), 0.3);
    --color-error: var(--color-red-400);
    --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
    --color-btn-primary-text: var(--color-slate-900);
    --color-card-border: rgba(var(--color-gray-400-rgb), 0.2);
    --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
    --color-error-rgb: var(--color-red-400-rgb);
  }
}

/* Base styles */
html { font-size: var(--font-size-base); font-family: var(--font-family-base); line-height: var(--line-height-normal); color: var(--color-text); background-color: var(--color-background); -webkit-font-smoothing: antialiased; box-sizing: border-box; }
body { margin: 0; padding: 0; }
*, *::before, *::after { box-sizing: inherit; }

/* Typography */
h1, h2, h3 { margin: 0; font-weight: var(--font-weight-semibold); line-height: var(--line-height-tight); letter-spacing: var(--letter-spacing-tight); }
h1 { font-size: var(--font-size-xl); }
h2, h3 { font-size: var(--font-size-lg); }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: var(--space-8) var(--space-16); border-radius: var(--radius-base); font-size: var(--font-size-base); font-weight: var(--font-weight-medium); cursor: pointer; transition: all var(--duration-normal) var(--ease-standard); border: none; text-decoration: none; white-space: nowrap; }
.btn:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--color-focus-ring); }
.btn--primary { background: var(--color-primary); color: var(--color-btn-primary-text); }
.btn--primary:hover { background: var(--color-primary-hover); }
.btn--secondary { background: var(--color-secondary); color: var(--color-text); }
.btn--secondary:hover { background: var(--color-secondary-hover); }
.btn--outline { background: transparent; border: 1px solid var(--color-border); color: var(--color-text); }
.btn--outline:hover { background: var(--color-secondary); }
.btn--sm { padding: var(--space-4) var(--space-8); font-size: var(--font-size-xs); height: 28px; border-radius: var(--radius-sm); }
.btn--full-width { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Form elements */
.form-control { display: block; width: 100%; padding: var(--space-8) var(--space-12); font-size: var(--font-size-md); color: var(--color-text); background-color: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-base); }
textarea.form-control { font-family: var(--font-family-base); resize: vertical; }
.form-control:focus { border-color: var(--color-primary); outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* Utility classes */
.hidden { display: none !important; }

/* Основные стили приложения */
.container { max-width: none; padding: 0; height: 100vh; display: flex; flex-direction: column; overflow: hidden; }
.app-header { display: flex; justify-content: space-between; align-items: center; height: auto; min-height: 40px; padding: var(--space-4) var(--space-16); border-bottom: 1px solid var(--color-border); background-color: var(--color-surface); flex-shrink: 0; transition: transform var(--duration-normal) var(--ease-standard); flex-wrap: wrap; gap: var(--space-8); }
.app-header.fullscreen-hidden { transform: translateY(-100%); }
.header-left { display: flex; align-items: center; gap: var(--space-16); flex-wrap: wrap; }
.panel-visibility-controls { display: flex; gap: var(--space-8); }
.panel-visibility-controls .btn.is-hidden { opacity: 0.6; background-color: var(--color-secondary); }
.header-buttons { display: flex; gap: var(--space-8); align-items: center; }
.main-content { flex: 1; display: grid; grid-template-columns: 20% 40% 40%; gap: var(--space-12); min-height: 0; padding: var(--space-12); overflow: hidden; transition: grid-template-columns var(--duration-normal) var(--ease-standard); }
.main-content.fullscreen { padding: var(--space-16); }

/* Стили панелей */
.panel { display: flex; flex-direction: column; background-color: var(--color-surface); border: 1px solid var(--color-card-border); border-radius: var(--radius-lg); padding: var(--space-16); overflow: hidden; min-height: 0; transition: opacity var(--duration-normal) var(--ease-standard); }
.panel-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-12); padding-bottom: var(--space-8); border-bottom: 1px solid var(--color-card-border-inner); flex-shrink: 0; }
.category-title-section { display: flex; align-items: center; gap: var(--space-12); flex: 1; }
.category-title { padding: var(--space-4) var(--space-8); border-radius: var(--radius-sm); outline: none; border: 1px solid transparent; }
.category-title:hover { background-color: var(--color-secondary); border-color: var(--color-border); }
.category-title:focus { background-color: var(--color-surface); border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-focus-ring); }
.category-title:empty::before { content: attr(data-placeholder); color: var(--color-text-secondary); }
.block-controls { display: flex; align-items: center; gap: var(--space-4); background-color: var(--color-bg-2); padding: var(--space-4) var(--space-8); border-radius: var(--radius-base); border: 1px solid var(--color-card-border-inner); }
.control-btn { width: 24px; height: 24px; display: flex; align-items: center; justify-content: center; padding: 0; font-size: var(--font-size-sm); font-weight: var(--font-weight-bold); background-color: var(--color-secondary); border: 1px solid var(--color-border); }
.control-btn:hover { background-color: var(--color-secondary-hover); transform: scale(1.05); }
.block-count { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); min-width: 24px; text-align: center; }
.counter { background-color: var(--color-bg-1); color: var(--color-primary); padding: var(--space-4) var(--space-8); border-radius: var(--radius-full); font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); min-width: 24px; text-align: center; }

/* Левая панель - тезисы */
.panel--left { overflow: hidden; }
.input-section { margin-bottom: var(--space-12); flex-shrink: 0; }
.input-section textarea { margin-bottom: var(--space-8); min-height: 80px; max-height: 120px; color: var(--color-text) !important; background-color: var(--color-surface) !important; border: 1px solid var(--color-border) !important; }
.input-section textarea::placeholder { color: var(--color-text-secondary); opacity: 0.7; }
.theses-container { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: var(--space-8); min-height: 0; }

/* Баблы для тезисов */
.thesis-bubble { background-color: var(--color-bg-1); padding: var(--space-8) var(--space-12); border-radius: var(--radius-md); border: 1px solid rgba(59, 130, 246, 0.2); cursor: grab; user-select: none; display: flex; justify-content: space-between; align-items: center; transition: all var(--duration-fast) var(--ease-standard); box-shadow: var(--shadow-xs); }
.thesis-bubble:hover { box-shadow: var(--shadow-sm); transform: translateY(-1px); }
.thesis-bubble.dragging { opacity: 0.7; cursor: grabbing; transform: rotate(3deg); box-shadow: var(--shadow-lg); z-index: 1000; }
.thesis-text { font-size: var(--font-size-sm); line-height: var(--line-height-normal); }
.remove-btn { background: none; border: none; color: rgba(var(--color-error-rgb), 0.6); cursor: pointer; padding: 0; width: 20px; height: 20px; border-radius: 50%; font-size: var(--font-size-md); line-height: 1; margin-left: var(--space-8); display: flex; align-items: center; justify-content: center; }
.remove-btn:hover { color: var(--color-error); background-color: rgba(var(--color-error-rgb), 0.1); }

/* Панели категорий */
.panel--category { overflow: hidden; }
.blocks-grid {
  flex: 1;
  display: grid;
  position: relative; /* <-- ВАЖНО для позиционирования раскрытого блока */
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
  overflow-y: auto;
  padding: var(--space-4);
  min-height: 0;
}

/* Адаптивные блоки для перетаскивания */
.drop-block { border: 2px dashed var(--color-border); border-radius: var(--radius-lg); padding: var(--space-8); display: flex; flex-direction: column; position: relative; transition: all var(--duration-fast) var(--ease-standard); background-color: rgba(var(--color-bg-2), 0.3); overflow: hidden; }
.drop-block:not(:has(.block-name:focus)) { cursor: grab; }
.drop-block:hover { border-color: rgba(var(--color-primary-rgb, 33, 128, 141), 0.5); background-color: rgba(var(--color-bg-2), 0.5); }
.drop-block.drag-over { border-color: var(--color-primary) !important; background-color: rgba(var(--color-primary-rgb, 33, 128, 141), 0.1) !important; border-style: solid !important; }
.drop-block.dragging-block { opacity: 0.4; cursor: grabbing; transform: rotate(2deg) scale(1.02); box-shadow: var(--shadow-lg); }
.drop-block.drag-placeholder { border-style: solid; border-color: var(--color-primary); background-color: rgba(var(--color-primary-rgb, 33, 128, 141), 0.15); }

/* Заголовок блока */
.block-header { display: flex; align-items: center; margin-bottom: var(--space-8); gap: var(--space-8); flex-shrink: 0; }
.block-number { font-size: var(--font-size-xs); font-weight: var(--font-weight-semibold); color: var(--color-text-secondary); background-color: var(--color-surface); padding: var(--space-4) var(--space-8); border-radius: var(--radius-full); border: 1px solid var(--color-border); min-width: 24px; text-align: center; }
.block-name { flex: 1; font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); background: transparent; border: 1px solid transparent; padding: var(--space-4); border-radius: var(--radius-sm); outline: none; }
.block-name:empty::before { content: attr(data-placeholder); color: var(--color-text-secondary); opacity: 0.7; }

/* Содержимое блока */
.block-content { flex: 1; display: flex; flex-direction: column; gap: var(--space-8); overflow: hidden; min-height: 0; }

/* Индикатор скрытых тезисов */
.more-indicator { font-size: var(--font-size-xs); color: var(--color-text-secondary); text-align: center; padding: var(--space-4); border-top: 1px solid var(--color-card-border-inner); cursor: pointer; margin-top: auto; flex-shrink: 0; }
.more-indicator:hover { color: var(--color-primary); background-color: rgba(var(--color-primary-rgb, 33, 128, 141), 0.05); }

/* Баблы в блоках */
.block-content .thesis-bubble { background-color: var(--color-bg-3); border-color: rgba(34, 197, 94, 0.2); font-size: var(--font-size-xs); padding: var(--space-8); }
.block-content .thesis-bubble .thesis-text { font-size: var(--font-size-xs); line-height: 1.3; }

/* Раскрывающийся блок */
.blocks-grid.has-expanded-block .drop-block:not(.is-expanded) {
    opacity: 0.3;
    /* Убрали pointer-events: none; */
}
.drop-block.is-expanded {
    height: auto !important;
    min-height: 200px;
    max-height: 60vh;
    position: absolute;
    width: calc(50% - var(--space-8) * 2); /* Учитываем gap с обеих сторон */
    z-index: 100;
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
    border-style: solid;
}
.drop-block.is-expanded .block-content { overflow-y: auto; }
.drop-block .close-expanded-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--color-secondary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 0;
    font-size: 16px;
    line-height: 1;
}
.drop-block.is-expanded .close-expanded-btn { display: flex; }
.drop-block.is-expanded .thesis-bubble { display: flex !important; }
.drop-block.is-expanded .more-indicator { display: none; }

/* Дополнительные состояния */
.panel--left.drag-over { background-color: rgba(var(--color-red-400-rgb), 0.1); border-color: var(--color-error); }
.fullscreen-active { overflow: hidden; }
.fullscreen { height: 100vh; }
.fullscreen .panel { height: 100%; }

/* Анимации */
@keyframes bubble-add {
  from { opacity: 0; transform: translateY(-10px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.thesis-bubble.new { animation: bubble-add var(--duration-normal) var(--ease-standard); }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-3px); }
  75% { transform: translateX(3px); }
}
.panel.shake { animation: shake 0.4s ease-in-out; }

/* Responsive */
@media (max-width: 1024px) {
  .main-content { grid-template-columns: 1fr; grid-template-rows: auto auto auto; overflow-y: auto; }
  .panel { min-height: 300px; }
  .blocks-grid { grid-template-columns: repeat(4, 1fr); }
  .drop-block.is-expanded { width: calc(25% - var(--space-8) * 1.5); }
}
@media (max-width: 768px) {
  .header-left, .header-buttons { flex-basis: 100%; justify-content: center; }
  .app-header { padding: var(--space-8); }
  .blocks-grid { grid-template-columns: repeat(3, 1fr); }
  .category-title-section { flex-direction: column; align-items: flex-start; gap: var(--space-8); }
  .drop-block.is-expanded { width: calc(33.33% - var(--space-8) * 1.33); }
}
@media (max-width: 480px) {
  .blocks-grid { grid-template-columns: repeat(2, 1fr); }
  .drop-block.is-expanded { width: calc(50% - var(--space-8)); }
}

/* Скрытие полос прокрутки */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--color-text-secondary); }