:root {
    --bg-dark: #0d1117;
    --bg-panel: rgba(22, 27, 34, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-main: #f0f6fc;
    --text-muted: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #3182ce;
    --success: #2ea043;
    --danger: #f85149;
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --blur: blur(12px);
    --radius: 16px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    min-height: 100vh;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(88, 166, 255, 0.08), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(163, 113, 247, 0.08), transparent 25%);
    background-attachment: fixed;
}

.app-container {
    width: 100%;
    max-width: 600px;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.greeting-area h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(90deg, #fff, #8b949e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--accent);
    font-size: 0.95rem;
    font-weight: 500;
    margin-top: 0.2rem;
}

/* Buttons */
.glass-btn {
    background: var(--bg-panel);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.75rem 1.25rem;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.glass-btn.primary-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    box-shadow: 0 4px 15px rgba(88, 166, 255, 0.4);
}

.glass-btn.primary-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(88, 166, 255, 0.5);
}

.glass-btn:active {
    transform: translateY(1px);
}

/* Notification Banner */
.notification-banner {
    background: rgba(248, 81, 73, 0.15);
    border: 1px solid rgba(248, 81, 73, 0.3);
    border-radius: var(--radius);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    animation: fadeIn 0.4s ease;
}

.notification-banner button {
    background: var(--danger);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 1rem;
    border-bottom: 2px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 0px;
}

.tab {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.05rem;
    font-weight: 500;
    padding: 0.75rem 0.25rem;
    cursor: pointer;
    position: relative;
    transition: var(--transition);
}

.tab.active {
    color: var(--text-main);
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent);
    border-radius: 3px 3px 0 0;
}

/* Task List */
.task-list-container {
    flex: 1;
}

.task-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.hidden-list, .hidden {
    display: none !important;
}

/* Task Card */
.task-card {
    background: var(--bg-panel);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: var(--transition);
    animation: slideUp 0.4s ease forwards;
    position: relative;
    overflow: hidden;
}

.task-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: var(--glass-shadow);
}

.task-card.completed {
    opacity: 0.6;
}

.task-card.completed .task-title {
    text-decoration: line-through;
    color: var(--text-muted);
}

/* Custom Checkbox */
.checkbox-container {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 0.2rem;
}

.checkbox-btn {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid var(--text-muted);
    background: transparent;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.checkbox-btn svg {
    width: 14px;
    height: 14px;
    fill: none;
    stroke: var(--bg-dark);
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 20;
    stroke-dashoffset: 20;
    transition: stroke-dashoffset 0.3s ease;
}

.task-card.completed .checkbox-btn {
    background: var(--success);
    border-color: var(--success);
}

.task-card.completed .checkbox-btn svg {
    stroke-dashoffset: 0;
}

/* Task Info */
.task-info {
    flex: 1;
}

.task-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.task-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.8rem;
    line-height: 1.4;
}

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

.task-time-badge {
    background: rgba(88, 166, 255, 0.15);
    color: var(--accent);
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.task-card.overdue .task-time-badge {
    background: rgba(248, 81, 73, 0.15);
    color: var(--danger);
}

.delete-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: var(--transition);
}

.delete-btn:hover {
    color: var(--danger);
    background: rgba(248, 81, 73, 0.1);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    animation: fadeIn 0.3s ease;
    padding: 1rem;
}

.glass-panel {
    background: rgba(22, 27, 34, 0.9);
    border: 1px solid var(--border-color);
    box-shadow: var(--glass-shadow);
    border-radius: var(--radius);
}

.modal-content {
    width: 100%;
    max-width: 450px;
    padding: 1.5rem;
    animation: scaleUp 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--text-main);
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
}

input[type="text"], input[type="date"], input[type="time"], textarea {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    color: var(--text-main);
    font-size: 1rem;
    transition: var(--transition);
    outline: none;
}

input[type="text"]:focus, input[type="date"]:focus, input[type="time"]:focus, textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.2);
}

::placeholder {
    color: rgba(255, 255, 255, 0.2);
}

.date-pills {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.pill {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.pill.active {
    background: rgba(88, 166, 255, 0.15);
    border-color: var(--accent);
    color: var(--accent);
}

.hidden-input {
    display: none;
    margin-top: 0.5rem;
}

.warning-text {
    color: var(--danger);
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

.modal-actions {
    margin-top: 2rem;
}

.submit-btn {
    width: 100%;
    background: var(--text-main);
    color: var(--bg-dark);
    border: none;
    padding: 0.85rem;
    border-radius: 8px;
    font-size: 1.05rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
}

.submit-btn:hover {
    background: #fff;
    box-shadow: 0 4px 15px rgba(255, 255, 255, 0.2);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}
.empty-state svg {
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleUp {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}