:root {
    --bg-color: #2b2b2b;
    --panel-bg: #161b22;
    --text-color: #c9d1d9;
    --accent-color: #58a6ff;
    --accent-glow: rgba(88, 166, 255, 0.4);
    --success-color: #2ea043;
    --border-color: #30363d;
}

* {
    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;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 100%;
    max-width: 500px;
    padding: 30px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}

h1 {
    text-align: center;
    margin-bottom: 20px;
    font-weight: 600;
    letter-spacing: 1px;
    color: #ffffff;
}

/* Sistema de Progresso */
.progress-container {
    margin-bottom: 30px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: bold;
}

.progress-bar-bg {
    background-color: #21262d;
    border-radius: 8px;
    height: 20px;
    width: 100%;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--accent-color);
    width: 0%;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Formulário de Adição */
.input-group {
    display: flex;
    margin-bottom: 20px;
    gap: 10px;
}

input[type="text"] {
    flex: 1;
    padding: 10px 15px;
    background-color: #0d1117;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-color);
    outline: none;
    transition: border-color 0.2s;
}

input[type="text"]:focus {
    border-color: var(--accent-color);
}

button {
    background-color: var(--accent-color);
    color: #ffffff;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s, box-shadow 0.2s;
}

button:hover {
    background-color: #3182ce;
    box-shadow: 0 0 8px var(--accent-glow);
}

/* Lista de Tarefas */
.task-list {
    list-style: none;
}

.task-item {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    background-color: #21262d;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    margin-bottom: 10px;
    transition: background-color 0.2s;
}

.task-item:hover {
    background-color: #30363d;
}

.task-item.completed {
    opacity: 0.6;
    text-decoration: line-through;
}

.task-checkbox {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    margin-right: 15px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.2s;
}

.task-checkbox:checked {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

.task-checkbox:checked::after {
    content: '✓';
    color: white;
    font-size: 14px;
    font-weight: bold;
}

.task-text {
    flex: 1;
    cursor: pointer;
}

.delete-btn {
    background: none;
    color: #f85149;
    border: none;
    padding: 5px;
    font-size: 18px;
    cursor: pointer;
    transition: color 0.2s, transform 0.2s;
}

.delete-btn:hover {
    color: #ff7b72;
    transform: scale(1.1);
}

/* Novo estilo do botão de reiniciar */
.actions {
    margin-top: 25px;
    display: flex;
    justify-content: center;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

.reset-btn {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

.reset-btn:hover {
    background-color: #21262d;
    box-shadow: none;
    color: #ffffff;
}