/* --- THEME VARIABLES --- */
:root {
    --bg-color: #f4f5f7;
    --text-color: #172b4d;
    --panel-bg: #ffffff;
    --border-color: #e1e4e8;
    --secondary-text: #6b778c;
    --column-bg: #ebecf0;
    --task-bg: #ffffff;
    --primary-color: #007bff;
    --hover-bg: #f4f5f7;
    --placeholder-bg: #d1d5da;
    --placeholder-border: #b1b8c0;
    --danger-color: #b00020;
    --shadow-color: rgba(0,0,0,0.1);
}

/* Change 'body.dark' to 'html.dark' */
html.dark {
    --bg-color: #1a1a1a;
    --text-color: #e6edf3;
    --panel-bg: #24292e;
    --border-color: #30363d;
    --secondary-text: #8b949e;
    --column-bg: #21262d;
    --task-bg: #161b22;
    --primary-color: #58a6ff;
    --hover-bg: #30363d;
    --placeholder-bg: #30363d;
    --placeholder-border: #8b949e;
    --danger-color: #f85149;
    --shadow-color: rgba(0,0,0,0.4);
}

/* --- BASE & RESET --- */
* { box-sizing: border-box; margin: 0; padding: 0; font-family: system-ui, sans-serif; }
body { background: var(--bg-color); color: var(--text-color); overflow: hidden; transition: background 0.2s, color 0.2s; }

.app-container { display: flex; flex-direction: column; height: 100vh; width: 100vw; overflow: hidden; }
.main-content { display: flex; flex: 1; overflow: hidden; position: relative; min-width: 0; }

/* --- SIDEBAR --- */
.sidebar {
    width: 240px;
    background: var(--panel-bg);
    border-right: 1px solid var(--border-color);
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    transition: width 0.2s ease, background 0.2s;
    overflow: hidden;
    flex-shrink: 0;
}
.sidebar.collapsed { width: 50px; padding: 15px 10px; align-items: center; }

.sidebar-header { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.brand { font-weight: bold; font-size: 1.1rem; white-space: nowrap; }
.boards-title { font-size: 0.7rem; color: var(--secondary-text); font-weight: 700; letter-spacing: 0.5px; }
.header-actions { display: flex; gap: 5px; }

.icon-btn {
    background: none;
    border: 1px solid transparent;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1.1rem;
    line-height: 1;
    color: var(--secondary-text);
}
.icon-btn:hover { background: var(--hover-bg); border-color: var(--border-color); color: var(--text-color); }

.btn-expand { display: none; }
.sidebar.collapsed .btn-expand { display: block; }
.sidebar.collapsed .btn-collapse { display: none; }

.add-board-form { display: flex; gap: 5px; width: 100%; justify-content: center; }
.add-board-form input { flex: 1; padding: 6px; border: 1px solid var(--border-color); border-radius: 4px; min-width: 0; background: var(--bg-color); color: var(--text-color); }
.add-board-form button { flex-shrink: 0; }

/* --- BOARD LIST (Sidebar) --- */
#board-list {
    list-style: none; width: 100%; margin-top: 5px; counter-reset: board-counter;
    flex: 1; overflow-y: auto; overflow-x: hidden; min-height: 0; outline: none;
    scrollbar-width: none; -ms-overflow-style: none;
}
#board-list::-webkit-scrollbar { width: 4px; }
#board-list::-webkit-scrollbar-track { background: transparent; }
#board-list::-webkit-scrollbar-thumb { background: transparent; border-radius: 2px; }
#board-list:hover::-webkit-scrollbar-thumb { background: var(--border-color); }

.board-item {
    counter-increment: board-counter; display: flex; align-items: center; gap: 8px;
    padding: 8px; border-radius: 4px; cursor: pointer; white-space: nowrap; position: relative;
}
.board-item:hover { background: var(--hover-bg); }
.board-item.active { background: var(--hover-bg); }

.board-item .dot::before {
    content: counter(board-counter); font-size: 0.8rem; font-weight: 600;
    color: var(--secondary-text); width: 1em; text-align: center; display: inline-block; flex-shrink: 0; 
}
.board-item.active .dot::before { color: var(--primary-color); }

.board-item .name { flex: 1 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; }

.delete-board-btn {
    flex: 0 0 auto; border: 1px solid transparent; padding: 2px 6px; font-size: 0.9rem;
    line-height: 1; opacity: 0; transition: opacity 0.2s;
}
.board-item:hover .delete-board-btn { opacity: 1; }
.delete-board-btn:hover { border-color: var(--border-color); background: var(--panel-bg); color: var(--danger-color); }

.sidebar.collapsed .brand, .sidebar.collapsed .boards-title, .sidebar.collapsed .board-item .name, .sidebar.collapsed .add-board-form input { display: none; }
.sidebar.collapsed .board-item { justify-content: center; padding: 8px 0; }
.sidebar.collapsed .board-item .dot::before { font-size: 1rem; }
.sidebar.collapsed .delete-board-btn { display: none !important; }

/* --- BOARD AREA & HEADER --- */
.board-area {
    flex: 1; padding: 20px; overflow: hidden; display: flex; flex-direction: column;
    min-width: 0; max-width: 100%;
}

.board-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; gap: 15px; min-width: 0; }
.header-actions { display: flex; gap: 10px; align-items: center; }

.btn-outline {
    padding: 6px 12px; background: transparent; color: var(--secondary-text);
    border: 1px solid var(--border-color); border-radius: 4px; cursor: pointer; font-weight: 500; white-space: nowrap;
}
.btn-outline:hover { background: var(--hover-bg); color: var(--text-color); border-color: var(--secondary-text); }

/* Board Title Input */
.title-form { flex: 1; display: flex; min-width: 0; }
.board-title-input {
    font-size: 1.5em; font-weight: 700; color: var(--text-color); padding: 4px 8px;
    border: 1px solid transparent; border-radius: 4px; background: transparent; outline: none;
    width: 100%; min-width: 0; cursor: text; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-family: inherit;
}
.board-title-input:hover { background: var(--hover-bg); }
.board-title-input:focus { background: var(--hover-bg); border-color: transparent; }

/* --- COLUMNS CONTAINER --- */
.board-columns-container {
    display: flex; gap: 16px; align-items: flex-start; overflow-x: auto; overflow-y: hidden;
    padding-bottom: 20px; flex: 1; min-height: 0; min-width: 0; width: 100%;
}
.board-columns-container::-webkit-scrollbar { height: 8px; }
.board-columns-container::-webkit-scrollbar-track { background: var(--bg-color); border-radius: 4px; }
.board-columns-container::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
.board-columns-container::-webkit-scrollbar-thumb:hover { background: var(--secondary-text); }

/* --- COLUMN --- */
.column {
    background: var(--column-bg); border-radius: 8px; padding: 10px; width: 260px; flex-shrink: 0;
    display: flex; flex-direction: column; max-height: 100%; transition: background 0.2s;
}

.column-header { display: flex; justify-content: space-between; align-items: center; padding: 4px 8px; margin-bottom: 10px; }
.column-name { font-weight: 600; font-size: 0.9rem; color: var(--text-color); }
.add-task-btn { padding: 2px 6px; font-size: 0.8rem; color: var(--secondary-text); }

.column-actions { display: flex; gap: 2px; }
.delete-column-btn { padding: 2px 6px; font-size: 0.8rem; color: var(--secondary-text); }
.delete-column-btn:hover { color: var(--danger-color); background: var(--hover-bg); }

/* Column Title Input */
.column-title-form { flex: 1; }
.column-title-input {
    font-weight: 600; font-size: 0.9rem; color: var(--text-color); background: transparent;
    border: 1px solid transparent; border-radius: 4px; padding: 2px 4px; outline: none; width: 100%; cursor: pointer;
}
.column-title-input:hover { background: var(--hover-bg); }
.column-title-input:focus { background: var(--panel-bg); border-color: var(--primary-color); cursor: text; }

/* --- TASK LIST --- */
.task-list { display: flex; flex-direction: column; gap: 12px; overflow-y: auto; min-height: 0; flex: 1 1 auto; scrollbar-width: none; padding-top: 4px; }
.task-list::-webkit-scrollbar { width: 4px; }
.task-list::-webkit-scrollbar-track { background: transparent; }
.task-list::-webkit-scrollbar-thumb { background: transparent; border-radius: 2px; }
.task-list:hover::-webkit-scrollbar-thumb { background: var(--border-color); }

/* --- TASK CARD --- */
.task-card {
    position: relative; 
    background: var(--task-bg); 
    padding: 8px 10px; /* Slightly adjusted padding */ 
    border-radius: 6px;
    box-shadow: 0 1px 2px var(--shadow-color); 
    font-size: 0.9rem; 
    color: var(--text-color); 
    cursor: pointer; 
}

/* Task Hover Toolbar - Moved to top-right outside the card! */
.task-toolbar { 
    position: absolute; 
    top: -10px; /* Moves it above the card */
    right: 6px; 
    display: flex; 
    gap: 2px; 
    opacity: 0; 
    transition: opacity 0.1s; 
    z-index: 10; 
}
.task-card:hover .task-toolbar { opacity: 1; }

/* Give the buttons a solid bubble background so they are visible over the column */
.task-tool-btn { 
    padding: 1px 5px; 
    font-size: 0.7rem; 
    background: var(--panel-bg); 
    border: 1px solid var(--border-color);
    border-radius: 4px; 
    color: var(--secondary-text); 
    line-height: 1.4;
}
.task-tool-btn:hover { 
    background: var(--hover-bg); 
    color: var(--danger-color); 
    border-color: var(--danger-color);
}

.task-form { width: 100%; }
.task-input {
    font-size: 0.9rem; color: var(--text-color); background: transparent; border: 1px solid transparent;
    border-radius: 4px; padding: 0; outline: none; width: 100%; cursor: pointer; font-family: inherit;
    resize: none; min-height: 20px; overflow-y: hidden; white-space: pre-wrap; line-height: 1.4;
}
.task-input:hover { background: var(--hover-bg); }
.task-input:focus { background: var(--hover-bg); border-color: var(--primary-color); cursor: text; }

.task-card.minimized { padding: 4px 8px; }
.task-card.minimized .task-input { height: 20px !important; max-height: 20px !important; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; cursor: pointer; }

/* --- DRAG AND DROP STATES --- */
body.is-dragging * { transition: none !important; cursor: grabbing !important; user-select: none !important; }

.task-drag {
    opacity: 0.95 !important; box-shadow: 0 12px 28px var(--shadow-color) !important;
    cursor: grabbing !important; transform: rotate(2deg) scale(1.03);
}

.placeholder {
    background: var(--placeholder-bg) !important; border: 2px dashed var(--placeholder-border) !important;
    border-radius: 6px; box-shadow: none !important;
}

/* Theme Toggle Button Icons */
#theme-toggle .moon { display: inline; }
#theme-toggle .sun { display: none; }
html.dark #theme-toggle .moon { display: none; }
html.dark #theme-toggle .sun { display: inline; }