:root {
    --color-purple: #8B5CF6;
    --color-pink: #EC4899;
    --color-blue: #3B82F6;
    --font-family: 'Poppins', sans-serif;
}

body {
    font-family: var(--font-family);
    background-color: #f9fafb;
    background-image: 
        radial-gradient(circle at 1% 1%, rgba(139, 92, 246, 0.1), transparent 30%),
        radial-gradient(circle at 99% 99%, rgba(236, 72, 153, 0.1), transparent 40%);
    transition: background-color 0.3s ease;
}

#app-container {
    opacity: 0;
    animation: fadeIn 0.5s ease-out forwards;
}

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

header a, button {
    transition: all 0.2s ease-in-out;
}

header a:active, button:active {
    transform: scale(0.97);
    transition: transform 0.1s ease;
}

.timer-mode-btn {
    flex-grow: 1;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-weight: 600;
    color: #4b5563;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    background-color: transparent;
    cursor: pointer;
}

.timer-mode-btn.active {
    color: white;
    background: linear-gradient(to right, var(--color-purple), var(--color-pink));
    box-shadow: 0 4px 15px -5px rgba(139, 92, 246, 0.6);
}

#progress-ring {
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    transition: stroke-dashoffset 1s linear;
}

#start-pause-btn {
    background: linear-gradient(to right, var(--color-purple), var(--color-pink));
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#start-pause-btn.paused {
    background: linear-gradient(to right, var(--color-blue), #60A5FA);
}

#start-pause-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 25px -8px rgba(139, 92, 246, 0.7);
}

#reset-btn:hover, #task-link-btn:hover {
    transform: rotate(-15deg);
}

.task-input {
    width: 100%;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    padding: 0.65rem 0.75rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}

.task-input:focus {
    border-color: var(--color-purple);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

.task-card {
    display: flex;
    align-items: center;
    padding: 1rem;
    background-color: #f9fafb;
    border: 1px solid #f3f4f6;
    border-radius: 0.75rem;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateY(10px);
    animation: slideInUp 0.4s ease-out forwards;
}

.task-card.completed {
    background-color: #f0fdf4;
}

.task-card.completed .task-name-display {
    text-decoration: line-through;
    color: #6b7280;
}

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

.task-card:hover {
    border-color: #d1d5db;
    transform: translateY(-4px);
    box-shadow: 0 7px 15px -5px rgba(0,0,0,0.07);
}

.task-card .toggle-complete-btn:hover,
.task-card .start-task-btn:hover,
.task-card .edit-task-btn:hover,
.task-card .delete-task-btn:hover {
    transform: scale(1.15);
}

@keyframes task-complete-glow {
    0% {
        box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    }
    100% {
        box-shadow: 0 0 0 12px rgba(16, 185, 129, 0);
    }
}

.task-card.is-completing {
    animation: task-complete-glow 0.7s ease-out;
}

#edit-modal {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#edit-modal.is-open {
    opacity: 1;
    pointer-events: auto;
}

#edit-modal-content {
    transform: scale(0.95);
    opacity: 0;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#edit-modal.is-open #edit-modal-content {
    transform: scale(1);
    opacity: 1;
}

.ranking-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    border: 1px solid transparent;
    transition: background-color 0.2s, border-color 0.2s, transform 0.2s;
}

.ranking-item:nth-child(even) {
    background-color: #f9fafb;
}

.ranking-item:hover {
    background-color: #f3f4f6;
    border-color: #e5e7eb;
    transform: translateX(5px);
}

.rank-badge {
    font-weight: 700;
    width: 2.5rem;
    text-align: center;
    flex-shrink: 0;
    font-size: 1.125rem;
}