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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --success: #10b981;
    --danger: #ef4444;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 700px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
}

.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text);
}

/* Mood Buttons */
.mood-section h2 {
    text-align: center;
}

.mood-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    margin-bottom: 1rem;
}

.mood-btn {
    flex: 1 1 calc(20% - 0.6rem);
    min-width: 80px;
    padding: 1rem 0.5rem;
    border: 2px solid var(--border);
    border-radius: 12px;
    background: white;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.mood-btn:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

.mood-btn.selected {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
}

.mood-btn .emoji {
    font-size: 2rem;
}

.mood-btn .label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-light);
}

/* Notes Section */
.notes-section {
    animation: slideDown 0.3s ease;
}

.notes-section label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text);
}

.notes-section textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    transition: border-color 0.2s;
}

.notes-section textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.save-btn {
    width: 100%;
    margin-top: 1rem;
    padding: 0.875rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.save-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

/* History Section */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.text-btn {
    background: none;
    border: none;
    color: var(--danger);
    font-size: 0.875rem;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.text-btn:hover {
    background: rgba(239, 68, 68, 0.1);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 400px;
    overflow-y: auto;
}

.history-item {
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    gap: 0.75rem;
    animation: slideIn 0.3s ease;
}

.history-item .emoji {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.history-item .content {
    flex: 1;
}

.history-item .date {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-bottom: 0.25rem;
}

.history-item .note {
    color: var(--text);
    font-size: 0.9rem;
}

.history-item .delete-btn {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 0.25rem;
    font-size: 1.25rem;
    transition: color 0.2s;
}

.history-item .delete-btn:hover {
    color: var(--danger);
}

.empty-state {
    text-align: center;
    color: var(--text-light);
    padding: 2rem;
    font-style: italic;
}

/* Insights Section */
.insights-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.insight-item {
    text-align: center;
    padding: 1rem 0.5rem;
    background: var(--bg);
    border-radius: 8px;
}

.insight-item .insight-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.insight-item .insight-label {
    font-size: 0.75rem;
    color: var(--text-light);
}

footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Animations */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Mobile */
@media (max-width: 480px) {
    header h1 {
        font-size: 2rem;
    }

    .mood-btn {
        flex: 1 1 calc(33.333% - 0.5rem);
    }

    .insights-grid {
        gap: 0.5rem;
    }

    .insight-item .insight-value {
        font-size: 1.5rem;
    }
}