:root {
    --bg-primary: #f4f5f7;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #172b4d;
    --text-secondary: #5e6c84;
    --accent: #0052cc;
    --accent-hover: #0065ff;
    --border: #dfe1e6;
    --danger: #de350b;
    --success: #36b37e;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
    --transition: 0.2s ease;

    /* Status colors */
    --status-not-started: #f4f5f7;
    --status-not-started-border: #dfe1e6;
    --status-in-progress: #fff7e6;
    --status-in-progress-border: #f0a500;
    --status-done: #e3fcef;
    --status-done-border: #36b37e;
}

[data-theme="dark"] {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-card: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79b8ff;
    --border: #30363d;
    --danger: #f85149;
    --success: #3fb950;
    --shadow: 0 1px 4px rgba(0, 0, 0, 0.5);
    
    /* Status colors */
    --status-not-started: #21262d;
    --status-not-started-border: #30363d;
    --status-in-progress: #2d2200;
    --status-in-progress-border: #f0a500;
    --status-done: #0d2b1a;
    --status-done-border: #3fb950;
}

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

body {
    font-family: sans-serif;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
}

.hidden {
    display: none ;
}

/*Modal*/

#modal-dialog {
    margin: auto;
    border: 2px solid var(--border);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    background: var(--bg-card);
    color: var(--text-primary);
    width: min(460px, 90vw);
    box-shadow: 0 8px 32px rgba(0,0,0,0.18);
}

#modal-dialog::backdrop {
    background: rgba(0,0,0,0.45);
    backdrop-filter: blur(50px);
}

#modal-dialog[open] {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

#modal-title {
    font-size: 1.4rem;
    text-align: center;
}

.modal-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
    margin-bottom: 0.5rem;
}

#modal-dialog label {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

#members-input {
    padding: 10px 14px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 14px;
    outline: none;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color var(--transition);
}

#members-input:focus {
    border-color: var(--accent);
}

#modal-error {
    color: var(--danger);
    font-size: 0.85rem;
    min-height: 1.2em;
}

#modal-submit {
    padding: 10px 20px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    margin-top: 0.5rem;
}

#modal-submit:hover {
    background: var(--accent-hover);
    transform: scale(1.02);
}

/*Nav*/

nav {
    position: relative;
    width: 100%;
    padding: 18px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

nav h1 {
    font-size: 1.3rem;
    padding: 0;
}

nav p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

#theme-toggle {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

#theme-toggle:hover {
    background: var(--accent);
    transform: translateY(-50%) scale(1.1);
}

/*Layout Cards container*/

.container {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 24px;
    padding: 2rem;
    width: 100%;
}

#backlog-card {
    width: 260px;
    flex-shrink: 0;
}

.members-container {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 20px;
    flex: 1;
}

.empty-state {
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-align: center;
    padding: 16px 8px;
    border: 2px dashed var(--border);
    border-radius: 8px;
    margin-top: 4px;
}

/*Cards*/

.card {
    background: var(--bg-card);
    border-radius: 14px;
    border: 2px solid var(--border);
    padding: 16px;
    transition: box-shadow var(--transition), border-color var(--transition);
    min-width: 220px;
}

.member-card {
    flex: 1;
    min-width: 200px;
    max-width: 300px;
}

.card:hover {
    box-shadow: var(--shadow);
}

/* Drag-over highlight */
.card.drag-over {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 8%, var(--bg-card));
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}

.heading {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.card-heading {
    font-size: 1rem;
    font-weight: 700;
}

.task-counter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 22px;
    height: 22px;
    padding: 0 6px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
}

/*Backlog*/

.backlog-input-row {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}

#backlog-card .heading {
    margin-bottom: 12px;
}

#backlog-card .backlog-input-row {
    margin-bottom: 8px;
}

#tasks-input {
    flex: 1;
    padding: 7px 7px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 13px;
    outline: none;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color var(--transition);
}

#tasks-input:focus {
    border-color: var(--accent);
}

#task-btn {
    padding: 5px 14px;
    border: none;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition);
}

#task-btn:hover {
    background: var(--accent-hover);
}

.task-error {
    color: var(--danger);
    font-size: 0.8rem;
    margin-bottom: 4px;
}

/*Tasks*/

.tasks-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-height: 40px;
}

.task {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border-radius: 8px;
    border: 2px solid var(--status-not-started-border);
    background: var(--status-not-started);
    color: var(--text-primary);
    font-size: 0.85rem;
    cursor: grab;
    transition: transform var(--transition), box-shadow var(--transition);
}

.task:active {
    cursor: grabbing;
}

.task:hover {
    transform: scale(1.01);
    box-shadow: var(--shadow);
}

.task-text {
    flex: 1;
    word-break: break-word;
}

/* Status colors */
.task[data-status="not-started"] {
    background: var(--status-not-started);
    border-color: var(--status-not-started-border);
}

.task[data-status="in-progress"] {
    background: var(--status-in-progress);
    border-color: var(--status-in-progress-border);
}

.task[data-status="done"] {
    background: var(--status-done);
    border-color: var(--status-done-border);
    cursor: not-allowed;
    opacity: 0.8;
}

/* Status select */
.task-status {
    padding: 3px 6px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.75rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    outline: none;
    flex-shrink: 0;
}

/* Delete button */
.delete-task {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.8rem;
    padding: 3px 5px;
    border-radius: 50%;
    cursor: pointer;
    line-height: 1;
    flex-shrink: 0;
    transition: background var(--transition), color var(--transition);
}

.delete-task:hover {
    background: var(--danger);
    color: #fff;
}

/* Drag ghost */
.is-dragging {
    opacity: 0.4;
    transform: scale(1.03);
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}