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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f7fa;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.tagline {
    color: #7f8c8d;
    font-size: 1.1rem;
}

.date-display {
    text-align: center;
    font-size: 1.2rem;
    color: #34495e;
    margin-bottom: 2rem;
}

.goal-section {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

h2 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.goal-input-container {
    display: flex;
    gap: 1rem;
}

#goal-input {
    flex: 1;
    padding: 0.8rem;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

#goal-input:focus {
    outline: none;
    border-color: #3498db;
}

button {
    background: #3498db;
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
}

button:hover {
    background: #2980b9;
}

.current-goal {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

#goal-text {
    font-size: 1.2rem;
    margin: 1rem 0;
    color: #2c3e50;
}

.goal-status {
    margin-top: 1.5rem;
}

#complete-goal {
    background: #27ae60;
}

#complete-goal:hover {
    background: #219a52;
}

.hidden {
    display: none;
}

#completion-status {
    color: #27ae60;
    font-weight: bold;
    font-size: 1.1rem;
}

.history-section {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.goals-list {
    margin-top: 1rem;
}

.goal-item {
    padding: 1rem;
    border-bottom: 1px solid #e0e0e0;
}

.goal-item:last-child {
    border-bottom: none;
}

.goal-date {
    font-size: 0.9rem;
    color: #7f8c8d;
}

.completed {
    color: #27ae60;
}

footer {
    text-align: center;
    margin-top: 3rem;
    color: #7f8c8d;
}

@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }

    .goal-input-container {
        flex-direction: column;
    }

    button {
        width: 100%;
    }
}