:root {
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: 1px solid rgba(255, 255, 255, 0.18);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    --primary-color: #4f46e5;
    --text-dark: #1f2937;
}

body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--text-dark);
    min-height: 100vh;
    transition: background-image 0.5s ease;
}

.app-container {
    padding: 40px;
    max-width: 1400px;
    margin: 0 auto;
}

header {
    margin-bottom: 40px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap; 
    gap: 15px;
}

h1 {
    color: white;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
    margin: 0;
}

button {
    cursor: pointer;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}

button:active { transform: scale(0.95); }

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    color: white;
    border: 1px solid rgba(255,255,255,0.4);
}
.btn-secondary:hover { background: rgba(255, 255, 255, 0.4); }

.input-area {
    background: white;
    padding: 10px;
    border-radius: 12px;
    display: flex;
    gap: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    max-width: 600px;
    width: 100%;
    margin-top: 10px; 
}

#inputNovaTarefa {
    flex: 1;
    border: none;
    outline: none;
    font-size: 16px;
    padding: 5px;
}

.board {
    display: flex;
    gap: 25px;
    align-items: flex-start;
    overflow-x: auto;
    padding-bottom: 20px; 
}

.column {
    flex: 1;
    min-width: 300px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px); 
    -webkit-backdrop-filter: blur(12px);
    border: var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: 16px;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.column-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    color: white;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.column-header h2 { margin: 0; font-size: 1.1rem; }

.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.todo-dot { background: #fbbf24; }
.doing-dot { background: #60a5fa; }
.done-dot { background: #34d399; }

.task-container {
    flex: 1;
    min-height: 150px;
}

.card {
    background: rgba(255, 255, 255, 0.9);
    padding: 15px;
    margin-bottom: 12px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    cursor: grab;
    transition: all 0.2s ease;
    position: relative;
    font-size: 0.95rem;
    border-left: 4px solid transparent;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0,0,0,0.1); }
.card:active { cursor: grabbing; }
#col-todo .card { border-left-color: #fbbf24; }
#col-doing .card { border-left-color: #60a5fa; }
#col-done .card { border-left-color: #34d399; opacity: 0.8; text-decoration: line-through; color: #666; }

.close-btn {
    position: absolute;
    top: 5px; right: 8px;
    color: #ccc;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
}
.close-btn:hover { color: #ef4444; }

@media (max-width: 768px) {
    .app-container {
        padding: 30px 15px;
    }
    
    header {
        margin-bottom: 30px;
    }

    .board {
        gap: 15px;
    }
    
    .column {
        min-width: 250px;
        padding: 15px;
    }
}

@media (max-width: 500px) {
    .app-container {
        padding: 20px 10px;
    }

    h1 {
        font-size: 1.8rem;
    }

    .header-content {
        gap: 10px;
        margin-bottom: 15px;
    }

    .input-area {
        padding: 8px;
        margin-top: 5px;
        max-width: 100%;
    }
    
    .column {
        min-width: 90vw;
        padding: 12px;
        border-radius: 12px;
    }
    
    .board {
        gap: 10px;
        padding-bottom: 10px;
    }

    .card {
        padding: 12px;
        margin-bottom: 8px;
        font-size: 0.9rem;
    }
}