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

:root {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-card: #242424;
    --bg-input: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border: #333;
    --monday: #8b5cf6;
    --tuesday: #3b82f6;
    --thursday: #22c55e;
    --friday: #f59e0b;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

header {
    padding: 1.5rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.header-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

select, button {
    font-family: inherit;
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
}

select:hover, button:hover {
    border-color: var(--accent);
}

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

.btn-secondary:hover {
    background: var(--accent-hover);
}

.btn-danger {
    background: transparent;
    border-color: var(--danger);
    color: var(--danger);
}

.btn-danger:hover {
    background: var(--danger);
    color: white;
}

/* Kanban Board */
.kanban-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    padding: 1.5rem;
    min-height: calc(100vh - 80px);
    align-items: start;
}

@media (max-width: 1200px) {
    .kanban-board {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .kanban-board {
        grid-template-columns: 1fr;
    }
    
    header {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Day Column */
.day-column {
    background: var(--bg-secondary);
    border-radius: 1rem;
    overflow: hidden;
    border: 1px solid var(--border);
}

.day-header {
    padding: 1rem 1.25rem;
    font-weight: 600;
    font-size: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

.day-header .day-focus {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.day-header .completion {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 1rem;
    background: var(--bg-input);
}

.day-column[data-day="monday"] .day-header { border-left: 4px solid var(--monday); }
.day-column[data-day="tuesday"] .day-header { border-left: 4px solid var(--tuesday); }
.day-column[data-day="thursday"] .day-header { border-left: 4px solid var(--thursday); }
.day-column[data-day="friday"] .day-header { border-left: 4px solid var(--friday); }

.day-content {
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
}

/* Block */
.block {
    background: var(--bg-card);
    border-radius: 0.75rem;
    overflow: hidden;
}

.block-header {
    padding: 0.75rem 1rem;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-input);
    transition: background 0.2s;
}

.block-header:hover {
    background: #363636;
}

.block-header .chevron {
    transition: transform 0.2s;
}

.block.collapsed .block-header .chevron {
    transform: rotate(-90deg);
}

.block.collapsed .block-content {
    display: none;
}

.block-content {
    padding: 0.5rem;
}

/* Exercise Card */
.exercise {
    padding: 0.75rem;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid transparent;
    transition: border-color 0.2s;
}

.exercise:last-child {
    margin-bottom: 0;
}

.exercise:hover {
    border-color: var(--border);
}

.exercise.completed {
    border-color: var(--success);
    background: rgba(34, 197, 94, 0.1);
}

.exercise-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.exercise-name {
    font-weight: 600;
    font-size: 0.85rem;
    flex: 1;
}

.exercise-sets {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--bg-input);
    padding: 0.2rem 0.5rem;
    border-radius: 0.25rem;
}

.exercise-why {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    display: none;
}

.exercise:hover .exercise-why,
.exercise.show-details .exercise-why {
    display: block;
}

.exercise-technique {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 0.75rem;
    display: none;
}

.exercise:hover .exercise-technique,
.exercise.show-details .exercise-technique {
    display: block;
}

/* Input Row */
.input-row {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.input-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.input-group label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input {
    width: 100%;
    padding: 0.5rem;
    border-radius: 0.375rem;
    border: 1px solid var(--border);
    background: var(--bg-input);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    text-align: center;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.input-group input::placeholder {
    color: var(--text-muted);
}

.check-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--border);
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
    margin-top: 1rem;
}

.check-btn:hover {
    border-color: var(--success);
}

.check-btn.checked {
    background: var(--success);
    border-color: var(--success);
}

.check-btn svg {
    width: 18px;
    height: 18px;
    stroke: var(--text-muted);
    stroke-width: 2.5;
    fill: none;
}

.check-btn.checked svg {
    stroke: white;
}

/* Previous data */
.previous-data {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px dashed var(--border);
}

.previous-data strong {
    color: var(--text-secondary);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background: var(--success);
    color: white;
    border-radius: 0.5rem;
    font-weight: 500;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* Warmup special styling */
.block.warmup .block-header {
    background: rgba(139, 92, 246, 0.2);
}

/* Scrollbar */
.day-content::-webkit-scrollbar {
    width: 6px;
}

.day-content::-webkit-scrollbar-track {
    background: transparent;
}

.day-content::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.day-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}