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

html {
    overscroll-behavior: none;
}

:root {
    --card-bg: rgba(255, 255, 255, 0.55);
    --card-border: rgba(255, 255, 255, 0.45);
    --card-hover: rgba(255, 255, 255, 0.7);
    --card-shadow: 0 2px 12px rgba(60, 60, 120, 0.1);
    --subtask-bg: rgba(255, 255, 255, 0.14);
    --subtask-border: rgba(255, 255, 255, 0.12);

    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #475569;

    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --accent-soft: rgba(99, 102, 241, 0.15);
    --green: #059669;
    --green-hover: #047857;
    --green-soft: rgba(5, 150, 105, 0.18);
    --amber: #f59e0b;
    --amber-soft: rgba(245, 158, 11, 0.15);
    --rose: #e11d48;
    --rose-soft: rgba(225, 29, 72, 0.12);
    --purple: #7c3aed;
    --purple-soft: rgba(124, 58, 237, 0.15);
    --sky: #0284c7;
    --sky-soft: rgba(2, 132, 199, 0.15);

    --input-bg: rgba(255, 255, 255, 0.7);
    --input-border: rgba(148, 163, 184, 0.4);
    --input-focus: #6366f1;
    --radius: 12px;
    --radius-sm: 8px;
    --blur: 18px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    min-height: 100vh;
    padding: 16px;
    color: var(--text-primary);
    background:
        linear-gradient(
            135deg,
            rgba(165, 180, 252, 0.45) 0%,
            rgba(196, 181, 253, 0.35) 30%,
            rgba(165, 243, 252, 0.3) 60%,
            rgba(167, 243, 208, 0.35) 100%
        ),
        url('img/background.jpg') center / cover no-repeat fixed;
    background-color: #c7d2fe;
    overscroll-behavior: none;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

/* ─── Progress Tower ─── */
.progress-tower {
    position: fixed;
    left: 46px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 9000;
    transition: opacity 0.3s;
}

.progress-tower.hidden {
    opacity: 0;
    pointer-events: none;
}

.tower-percentage {
    font-size: 1.3em;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: -0.5px;
    margin-bottom: 6px;
}

/* Tower roof */
.tower-roof {
    width: 0;
    height: 0;
    border-left: 40px solid transparent;
    border-right: 40px solid transparent;
    border-bottom: 28px solid rgba(255, 255, 255, 0.75);
    margin-bottom: -1px;
    filter: drop-shadow(0 -2px 4px rgba(60, 60, 120, 0.1));
}

.tower-body {
    position: relative;
    width: 68px;
    height: 550px;
    background: rgba(255, 255, 255, 0.35);
    border: 2px solid rgba(255, 255, 255, 0.6);
    border-radius: 3px 3px 6px 6px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(60, 60, 120, 0.12);
}

/* Floors grid overlaying the fill */
.tower-floors {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    z-index: 2;
    display: flex;
    flex-direction: column;
    pointer-events: none;
}

.tower-floor {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border-bottom: 2px solid rgba(255, 255, 255, 0.45);
}

.tower-floor:last-child {
    border-bottom: none;
}

.tower-window {
    width: 22px;
    height: 24px;
    background: rgba(255, 255, 255, 0.2);
    border: 1.5px solid rgba(255, 255, 255, 0.55);
    border-radius: 2px 2px 0 0;
    position: relative;
}

/* Cross divider */
.tower-window::before {
    content: '';
    position: absolute;
    top: 0; bottom: 0;
    left: 50%;
    width: 1.5px;
    background: rgba(255, 255, 255, 0.55);
    transform: translateX(-50%);
}

.tower-window::after {
    content: '';
    position: absolute;
    left: 0; right: 0;
    top: 50%;
    height: 1.5px;
    background: rgba(255, 255, 255, 0.55);
    transform: translateY(-50%);
}

.tower-fill {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 0%;
    background: linear-gradient(
        to top,
        var(--accent) 0%,
        #818cf8 30%,
        #a78bfa 50%,
        #7dd3fc 70%,
        var(--green) 100%
    );
    z-index: 1;
    transition: height 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: inset 0 2px 8px rgba(255, 255, 255, 0.3);
}

/* Base / foundation */
.tower-base {
    width: 80px;
    height: 12px;
    background: rgba(255, 255, 255, 0.75);
    border-radius: 0 0 6px 6px;
    border: 2px solid rgba(255, 255, 255, 0.6);
    border-top: none;
    box-shadow: 0 4px 10px rgba(60, 60, 120, 0.1);
    margin-top: -1px;
}

.tower-count {
    font-size: 0.88em;
    font-weight: 700;
    color: var(--text-muted);
    white-space: nowrap;
    margin-top: 8px;
}

.tower-count span {
    color: var(--text-primary);
}

/* ─── Greeting Banner ─── */
.greeting-banner {
    padding: 10px 0 2px;
    margin-bottom: 6px;
}

.greeting-banner .greeting-text {
    font-size: 1.2em;
    font-weight: 700;
    color: var(--text-primary);
}

.greeting-banner .greeting-sub {
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-top: 2px;
    font-weight: 500;
}

/* ─── Header ─── */
header {
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

h1 {
    font-size: 1.4em;
    color: var(--text-primary);
    font-weight: 700;
    letter-spacing: -0.3px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ─── View Toggle ─── */
.view-toggle {
    display: flex;
    background: rgba(255, 255, 255, 0.45);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-sm);
    border: 1px solid var(--card-border);
    overflow: hidden;
}

.toggle-btn {
    padding: 7px 16px;
    font-size: 0.85em;
    background: transparent;
    color: var(--text-secondary);
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.toggle-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.3);
}

.toggle-btn.active {
    background: var(--accent);
    color: white;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.archive-count {
    background: rgba(255, 255, 255, 0.25);
    padding: 1px 7px;
    border-radius: 10px;
    font-size: 0.8em;
    font-weight: 600;
    min-width: 20px;
    text-align: center;
}

.toggle-btn:not(.active) .archive-count {
    background: var(--accent-soft);
    color: var(--accent);
}

/* ─── Context Menu ─── */
.context-menu {
    position: fixed;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: var(--radius);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.06);
    z-index: 2000;
    min-width: 170px;
    display: none;
    overflow: hidden;
}

.context-menu.show { display: block; }

.context-menu-item {
    padding: 9px 14px;
    cursor: pointer;
    transition: background 0.15s;
    font-size: 0.85em;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
}

.context-menu-item:last-child { border-bottom: none; }
.context-menu-item:hover { background: var(--accent-soft); color: var(--accent); }
.context-menu-item.danger:hover { background: var(--rose-soft); color: var(--rose); }

/* ─── Confirm Dialog ─── */
.confirm-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.3);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.confirm-overlay.open {
    display: flex;
}

.confirm-dialog {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-radius: 16px;
    padding: 28px 32px 22px;
    min-width: 300px;
    max-width: 360px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.6);
    animation: confirmIn 0.2s ease;
}

@keyframes confirmIn {
    from { opacity: 0; transform: scale(0.92) translateY(8px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.confirm-icon {
    font-size: 2.2em;
    margin-bottom: 10px;
}

.confirm-message {
    font-size: 0.95em;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 20px;
    line-height: 1.4;
}

.confirm-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.btn-confirm-cancel,
.btn-confirm-delete {
    padding: 8px 22px;
    border-radius: var(--radius-sm);
    font-size: 0.88em;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.15s;
}

.btn-confirm-cancel {
    background: rgba(0, 0, 0, 0.06);
    color: var(--text-secondary);
}

.btn-confirm-cancel:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
}

.btn-confirm-delete {
    background: var(--rose);
    color: white;
    box-shadow: 0 2px 8px rgba(225, 29, 72, 0.25);
}

.btn-confirm-delete:hover {
    background: #be123c;
    box-shadow: 0 4px 12px rgba(225, 29, 72, 0.35);
}

/* ─── Modal ─── */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.3);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.open { display: flex; }

.modal-content {
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-radius: 16px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.6);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.modal-header h2 {
    font-size: 1.1em;
    font-weight: 600;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5em;
    color: var(--text-muted);
    cursor: pointer;
    width: 28px; height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
    line-height: 1;
}

.close-btn:hover { background: var(--rose-soft); color: var(--rose); }

.modal-content form { padding: 16px 20px; }

/* ─── Form ─── */
.form-group { margin-bottom: 12px; }

.form-row {
    display: grid;
    gap: 10px;
}

.form-row-2 { grid-template-columns: 1fr 1fr; }

label {
    display: block;
    margin-bottom: 4px;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.82em;
}

input[type="text"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--input-border);
    border-radius: var(--radius-sm);
    font-size: 0.9em;
    font-family: inherit;
    transition: all 0.2s;
    background: var(--input-bg);
    color: var(--text-primary);
}

input[type="text"]:focus,
input[type="date"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--input-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

textarea { resize: vertical; }

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 6px;
    cursor: pointer;
    font-size: 0.82em;
    color: var(--text-secondary);
    font-weight: 400;
}

.checkbox-label input[type="checkbox"] {
    width: 14px; height: 14px;
    cursor: pointer;
    accent-color: var(--accent);
}

/* ─── Color Picker ─── */
.color-picker-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.color-input {
    width: 32px !important;
    height: 32px;
    padding: 1px !important;
    border: 2px solid var(--input-border) !important;
    border-radius: 6px !important;
    cursor: pointer;
    background: none !important;
    flex-shrink: 0;
}

.color-input::-webkit-color-swatch-wrapper { padding: 1px; }
.color-input::-webkit-color-swatch { border: none; border-radius: 3px; }

.color-presets {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.color-dot {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.15s;
    flex-shrink: 0;
}

.color-dot:hover {
    transform: scale(1.2);
    border-color: rgba(0, 0, 0, 0.15);
}

.color-dot.active {
    border-color: var(--text-primary);
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.8);
}

/* ─── Buttons ─── */
button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: all 0.2s;
}

.btn-primary {
    width: 100%;
    padding: 10px;
    font-size: 0.95em;
    background: var(--accent);
    color: white;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.25);
}

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

.btn-add {
    padding: 7px 16px;
    font-size: 0.85em;
    background: var(--accent);
    color: white;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.25);
}

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

.btn-small {
    padding: 4px 10px;
    font-size: 0.78em;
    font-weight: 600;
}

.btn-complete {
    background: var(--green);
    color: white;
    box-shadow: 0 1px 4px rgba(5, 150, 105, 0.25);
}

.btn-complete:hover {
    background: var(--green-hover);
    box-shadow: 0 2px 8px rgba(5, 150, 105, 0.35);
}

.btn-archive {
    background: var(--purple);
    color: white;
    box-shadow: 0 1px 4px rgba(124, 58, 237, 0.25);
}

.btn-archive:hover {
    background: #6d28d9;
    box-shadow: 0 2px 8px rgba(124, 58, 237, 0.35);
}

.btn-restore {
    background: var(--sky-soft);
    color: var(--sky);
}

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

.btn-delete {
    background: var(--rose-soft);
    color: var(--rose);
}

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

/* ─── Tasks ─── */
.tasks-container {
    display: grid;
    gap: 8px;
    contain: layout style;
}

/* ─── Card ─── */
.task-card {
    backdrop-filter: blur(var(--blur));
    -webkit-backdrop-filter: blur(var(--blur));
    border-radius: var(--radius);
    padding: 12px 14px;
    box-shadow: var(--card-shadow);
    cursor: grab;
    transition: all 0.2s;
    border: 1px solid rgba(255, 255, 255, 0.35);
    position: relative;
    /* background set inline via JS using task color */
}

.task-card:hover {
    box-shadow: 0 4px 20px rgba(60, 60, 120, 0.14);
    filter: brightness(1.04);
}

.task-card:active { cursor: grabbing; }
.task-card.dragging { opacity: 0.4; }

.task-card.archived-card {
    cursor: default;
}

.task-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
    gap: 8px;
}

.task-title {
    font-size: 0.95em;
    font-weight: 700;
    color: var(--text-primary);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.task-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.task-size-badge {
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.7em;
    font-weight: 700;
    white-space: nowrap;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.task-size-badge.small { background: rgba(2, 132, 199, 0.22); color: #0c4a6e; }
.task-size-badge.medium { background: rgba(245, 158, 11, 0.25); color: #92400e; }
.task-size-badge.large { background: rgba(225, 29, 72, 0.2); color: #9f1239; }

.task-description {
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-size: 0.84em;
    font-weight: 500;
    line-height: 1.4;
    white-space: pre-wrap;
    word-wrap: break-word;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.task-description.expanded {
    -webkit-line-clamp: unset;
    display: block;
    overflow: visible;
}

/* ─── Due Date Badge ─── */
.due-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.72em;
    font-weight: 700;
    white-space: nowrap;
}

.due-badge.due-ok { background: rgba(5, 150, 105, 0.25); color: #064e3b; }
.due-badge.due-soon { background: rgba(245, 158, 11, 0.28); color: #92400e; }
.due-badge.due-overdue { background: rgba(225, 29, 72, 0.25); color: #9f1239; }

.due-badge.due-done {
    background: rgba(148, 163, 184, 0.2);
    color: var(--text-muted);
    text-decoration: line-through;
}

/* ─── Progress ─── */
.progress-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: rgba(0, 0, 0, 0.08);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #a78bfa, var(--green));
    transition: width 0.5s ease;
    border-radius: 3px;
}

.progress-text {
    font-size: 0.78em;
    font-weight: 700;
    color: var(--text-secondary);
    min-width: 32px;
    text-align: right;
}

/* ─── Reward ─── */
.reward-section {
    background: rgba(16, 185, 129, 0.08);
    padding: 5px 10px;
    border-radius: var(--radius-sm);
    margin-bottom: 6px;
    font-size: 0.82em;
    border: 1px solid rgba(16, 185, 129, 0.15);
    display: flex;
    align-items: center;
    gap: 6px;
}

.reward-hidden { color: var(--text-muted); font-style: italic; }

.reward-revealed {
    color: #047857;
    font-weight: 600;
    animation: rewardPop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ─── Task Actions ─── */
.task-actions {
    display: flex;
    gap: 6px;
    margin-top: 6px;
}

/* ─── Subtask Collapse Toggle ─── */
.subtask-toggle {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-top: 8px;
    padding: 4px 8px;
    cursor: pointer;
    border: none;
    background: rgba(99, 102, 241, 0.08);
    border-radius: var(--radius-sm);
    color: var(--accent);
    font-size: 0.78em;
    font-weight: 600;
    transition: all 0.15s;
}

.subtask-toggle:hover {
    background: var(--accent-soft);
}

.subtask-toggle .toggle-arrow {
    display: inline-block;
    transition: transform 0.2s;
    font-size: 0.8em;
}

.subtask-toggle.collapsed .toggle-arrow {
    transform: rotate(-90deg);
}

/* ─── Subtasks ─── */
.subtasks-container {
    margin-top: 6px;
    padding-left: 12px;
    border-left: 2px solid rgba(99, 102, 241, 0.25);
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.2s ease;
}

.subtasks-container.collapsed {
    max-height: 0 !important;
    opacity: 0;
    margin-top: 0;
}

.subtask {
    background: var(--subtask-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    margin-bottom: 4px;
    cursor: grab;
    font-size: 0.85em;
    border: 1px solid var(--subtask-border);
    position: relative;
    transition: all 0.15s;
}

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

.subtask:hover {
    background: rgba(255, 255, 255, 0.28);
    border-color: rgba(99, 102, 241, 0.2);
}

.subtask:active { cursor: grabbing; }
.subtask.dragging { opacity: 0.4; }

.subtask-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
    gap: 6px;
}

.subtask-title {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 0.92em;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.subtask-progress-row {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 4px;
}

.subtask-progress {
    flex: 1;
    height: 4px;
    background: rgba(0, 0, 0, 0.08);
    border-radius: 2px;
    overflow: hidden;
}

.subtask-progress-fill {
    height: 100%;
    background: var(--green);
    transition: width 0.3s ease;
    border-radius: 2px;
}

.subtask-actions {
    display: flex;
    gap: 4px;
    margin-top: 4px;
}

/* ─── Drop Zone ─── */
.drop-zone {
    border: 2px dashed rgba(99, 102, 241, 0.3);
    border-radius: var(--radius-sm);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8em;
    transition: all 0.2s;
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    padding: 0;
    margin-top: 0;
}

.drop-zone.visible {
    opacity: 1;
    max-height: 60px;
    padding: 10px;
    margin-top: 8px;
}

.drop-zone.drag-over {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent);
}

/* ─── Completed ─── */
.completed .task-title,
.completed .subtask-title {
    text-decoration: line-through;
    color: var(--text-muted);
}

.completed { opacity: 0.75; }

/* ─── Empty / Loading ─── */
.empty-state {
    text-align: center;
    padding: 50px 20px;
    color: var(--text-muted);
}

.empty-state h2 {
    font-size: 1.2em;
    margin-bottom: 6px;
    color: var(--text-secondary);
}

.empty-state p { font-size: 0.9em; }

.loading {
    text-align: center;
    padding: 50px 20px;
    color: var(--text-muted);
}

.spinner {
    border: 3px solid rgba(0, 0, 0, 0.08);
    border-top: 3px solid var(--accent);
    border-radius: 50%;
    width: 32px; height: 32px;
    animation: spin 1s linear infinite;
    margin: 0 auto 12px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ─── Animations ─── */
@keyframes cardIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes rewardPop {
    0% { transform: scale(0.8); opacity: 0; }
    60% { transform: scale(1.08); }
    100% { transform: scale(1); opacity: 1; }
}

.confetti-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 9999;
}

/* ─── Drop Indicator ─── */
.drop-indicator {
    position: fixed;
    height: 3px;
    background: var(--accent);
    border-radius: 2px;
    z-index: 100;
    pointer-events: none;
    box-shadow: 0 0 8px rgba(99, 102, 241, 0.5);
    transition: top 0.08s ease;
}

.drop-indicator::before,
.drop-indicator::after {
    content: '';
    position: absolute;
    top: -4px;
    width: 11px;
    height: 11px;
    background: var(--accent);
    border-radius: 50%;
}

.drop-indicator::before { left: -5px; }
.drop-indicator::after { right: -5px; }

.drop-indicator-subtask {
    height: 2px;
    box-shadow: 0 0 6px rgba(99, 102, 241, 0.4);
}

.drop-indicator-subtask::before,
.drop-indicator-subtask::after {
    width: 8px;
    height: 8px;
    top: -3px;
}

.drop-indicator-subtask::before { left: -4px; }
.drop-indicator-subtask::after { right: -4px; }

.task-card.just-completed {
    animation: completeFlash 0.6s ease;
}

@keyframes completeFlash {
    0% { box-shadow: var(--card-shadow); }
    40% { box-shadow: 0 0 20px rgba(5, 150, 105, 0.35), 0 0 40px rgba(5, 150, 105, 0.15); }
    100% { box-shadow: var(--card-shadow); }
}

/* ─── Responsive ─── */
@media (max-width: 640px) {
    body { padding: 12px; }
    h1 { font-size: 1.2em; }

    header {
        flex-direction: column;
        align-items: stretch;
    }

    .header-actions { justify-content: space-between; }
    .view-toggle { margin-left: auto; }
    .form-row-2 { grid-template-columns: 1fr; }
    .progress-tower { left: 8px; }
    .tower-body { width: 46px; height: 340px; }
    .tower-roof {
        border-left-width: 26px;
        border-right-width: 26px;
        border-bottom-width: 18px;
    }
    .tower-base { width: 54px; height: 8px; }
    .tower-window { width: 14px; height: 14px; }
    .tower-floor { gap: 0; }
    .tower-percentage { font-size: 0.9em; }
    .tower-count { font-size: 0.65em; }
    .subtask {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }
    .greeting-banner .greeting-text { font-size: 1em; }
}