/* Modern Professional Dark Theme Variables */
:root {
    /* Base Colors */
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    
    /* Text Colors */
    --text-primary: #c9d1d9;
    --text-secondary: #8b949e;
    --text-muted: #484f58;
    
    /* Accents */
    --accent-color: #58a6ff;
    --accent-hover: #79b8ff;
    --accent-dim: rgba(88, 166, 255, 0.15);
    --border-color: #30363d;
    
    /* Semantic Colors */
    --success: #3fb950;
    --warning: #d29922;
    --danger: #f85149;
    
    /* Column Colors */
    --col-backlog: #8b949e;
    --col-todo: #d29922;
    --col-progress: #a371f7;
    --col-done: #3fb950;

    /* Shadow & Radius */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
    --radius-md: 6px;
    --radius-lg: 12px;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.logo span {
    color: var(--accent-color);
}

.header-nav {
    display: flex;
    gap: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
}

.btn:hover {
    background: var(--border-color);
    border-color: var(--text-secondary);
}

.btn-primary {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

/* Board Layout */
.board-container {
    flex: 1;
    padding: 2rem;
    overflow-x: auto;
}

.board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    height: calc(100vh - 120px);
    min-width: 1200px; /* Ensure columns don't squish too much */
}

/* Column Styles */
.column {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: border-color 0.2s;
}

.column-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    user-select: none;
}

.column-title {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.column-badge {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.col-backlog .column-badge { background: var(--col-backlog); }
.col-todo .column-badge { background: var(--col-todo); }
.col-progress .column-badge { background: var(--col-progress); }
.col-done .column-badge { background: var(--col-done); }

.task-count {
    background: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    min-width: 24px;
    text-align: center;
}

/* Task List */
.task-list {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.task-list::-webkit-scrollbar {
    width: 6px;
}

.task-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

/* Task Card */
.task-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    cursor: grab;
    transition: all 0.2s ease;
    position: relative;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.task-card:hover {
    border-color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

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

.task-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.priority-badge {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
    text-transform: uppercase;
}

.p-high { color: var(--danger); background: rgba(248, 81, 73, 0.15); border: 1px solid rgba(248, 81, 73, 0.2); }
.p-med { color: var(--warning); background: rgba(210, 153, 34, 0.15); border: 1px solid rgba(210, 153, 34, 0.2); }
.p-low { color: var(--success); background: rgba(63, 185, 80, 0.15); border: 1px solid rgba(63, 185, 80, 0.2); }

.task-date {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.task-content {
    font-size: 0.9rem;
    color: var(--text-primary);
    white-space: pre-wrap;
    word-break: break-word;
    margin-bottom: 0.75rem;
}

.task-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    font-size: 0.7rem;
    color: var(--accent-color);
    background: var(--accent-dim);
    padding: 2px 8px;
    border-radius: 12px;
}

/* Landing Page Specifics */
.landing {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
    text-align: center;
}

.landing-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent-color), var(--success));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    margin-top: 4rem;
    width: 100%;
}

.feature-item {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    text-align: left;
}

/* Utilities */
.text-muted { color: var(--text-secondary); }
.hidden { display: none; }