:root {
    --bg-color: #f4f6f8;
    --text-color: #333;
    --card-bg: #fff;
    --header-bg: #fff;
    --border-color: #e0e0e0;
    --primary-color: #4a90e2;
    --primary-hover: #357abd;
    --danger-color: #e74c3c;
    --success-color: #2ecc71;
    --col-lead: #95a5a6;
    --col-contacted: #f39c12;
    --col-meeting: #3498db;
    --col-proposal: #9b59b6;
    --col-negotiating: #e67e22;
    --col-won: #2ecc71;
    --col-lost: #e74c3c;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 8px rgba(0,0,0,0.15);
}

[data-theme="dark"] {
    --bg-color: #1e1e1e;
    --text-color: #e0e0e0;
    --card-bg: #2d2d2d;
    --header-bg: #252525;
    --border-color: #444;
    --shadow: 0 2px 4px rgba(0,0,0,0.3);
    --shadow-hover: 0 4px 8px rgba(0,0,0,0.5);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

/* Header */
header {
    background-color: var(--header-bg);
    padding: 1rem 2rem;
    box-shadow: var(--shadow);
    z-index: 10;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.controls a.github-btn {
    background-color: #24292e;
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.controls a.github-btn:hover {
    background-color: #000;
}

[data-theme="dark"] .controls a.github-btn {
    background-color: #333;
    border: 1px solid #555;
}

.controls button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.controls button:hover {
    background-color: var(--primary-hover);
}

#theme-toggle {
    background-color: transparent;
    color: var(--text-color);
    font-size: 1.2rem;
    padding: 0.5rem;
}
#theme-toggle:hover {
    background-color: rgba(0,0,0,0.1);
}
[data-theme="dark"] #theme-toggle:hover {
    background-color: rgba(255,255,255,0.1);
}

/* Stats Bar */
.stats-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.stat-card {
    background-color: var(--card-bg);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    min-width: 150px;
}

.stat-label {
    font-size: 0.8rem;
    color: #888;
    text-transform: uppercase;
}

.stat-value {
    font-size: 1.2rem;
    font-weight: bold;
}

/* Filters */
.filters {
    display: flex;
    gap: 1rem;
}

.filters input, .filters select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--card-bg);
    color: var(--text-color);
}

.secondary {
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
}

/* Kanban Board */
.kanban-board {
    display: flex;
    gap: 1rem;
    padding: 1rem 2rem;
    overflow-x: auto;
    overflow-y: hidden;
    flex: 1;
}

.column {
    background-color: var(--header-bg);
    border-radius: 8px;
    min-width: 300px;
    max-width: 300px;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
}

.column-header {
    padding: 1rem;
    font-weight: bold;
    border-bottom: 3px solid transparent;
    display: flex;
    justify-content: space-between;
}

.column-count {
    background: rgba(128,128,128,0.2);
    padding: 0.1rem 0.5rem;
    border-radius: 12px;
    font-size: 0.8rem;
}

.column-body {
    padding: 0.5rem;
    flex: 1;
    overflow-y: auto;
    min-height: 100px;
}

.column-body.drag-over {
    background-color: rgba(0,0,0,0.05);
}
[data-theme="dark"] .column-body.drag-over {
    background-color: rgba(255,255,255,0.05);
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
    margin-bottom: 0.8rem;
    cursor: grab;
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s, transform 0.1s;
    position: relative;
}

.card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.card.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

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

.card-title {
    font-weight: bold;
    font-size: 1.1rem;
}

.card-actions i {
    cursor: pointer;
    margin-left: 0.5rem;
    color: #888;
}
.card-actions i:hover.fa-edit { color: var(--primary-color); }
.card-actions i:hover.fa-trash { color: var(--danger-color); }

.card-company {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
}
[data-theme="dark"] .card-company { color: #aaa; }

.card-value {
    font-weight: bold;
    color: var(--success-color);
    margin-bottom: 0.5rem;
}

.card-date {
    font-size: 0.8rem;
    color: #888;
}

.card-notes {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    padding-top: 0.5rem;
    border-top: 1px dashed var(--border-color);
    white-space: pre-wrap;
}

.card-quick-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.75rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-color);
    gap: 0.5rem;
}

.move-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

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

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 100;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    width: 100%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.close-btn {
    position: absolute;
    top: 1rem; right: 1.5rem;
    font-size: 1.5rem;
    cursor: pointer;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.submit-btn {
    width: 100%;
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-weight: bold;
    cursor: pointer;
    font-size: 1rem;
}

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

/* Responsive */
@media (max-width: 768px) {
    .header-content { flex-direction: column; gap: 1rem; align-items: flex-start; }
    .stats-bar { flex-wrap: wrap; }
    .filters { flex-wrap: wrap; }
    .column { min-width: 250px; }
}