:root {
    --primary-color: #4A90E2;
    --secondary-color: #5C6BC0;
    --background-color: #f5f6fa;
    --card-color: #ffffff;
    --text-color: #2c3e50;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --link-color: #2980b9;
    --dato-color: #27ae60;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    width: 95%;
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem;
}

.hidden {
    display: none;
}

/* Auth Section */
.auth-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-card {
    background: var(--card-color);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    width: 90%;
    max-width: 400px;
    text-align: center;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1.5rem 0;
}

.input-group input {
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.input-group input:focus {
    border-color: var(--primary-color);
    outline: none;
}

/* Buttons */
.btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform 0.2s, opacity 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

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

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

.button-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    justify-content: center;
    width: 100%;
}

/* Notes Section */
.notes-section {
    max-width: 800px;
    margin: 0 auto;
}

.notes-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.btn-logout {
    background: #e74c3c;
    color: white;
}

.notes-input {
    margin-bottom: 2rem;
}

.notes-input textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    margin-bottom: 1rem;
    resize: vertical;
}

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

.note-title-input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.note-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.note-type-select {
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    flex: 1;
}

.notes-filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.btn-filter {
    background: #f1f2f6;
    color: var(--text-color);
}

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

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

.notes-list {
    display: grid;
    gap: 1rem;
}

.note-item {
    background: var(--card-color);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    animation: fadeIn 0.3s ease-in;
    border-left: 4px solid var(--primary-color);
}

.note-item.link-type {
    border-left-color: var(--link-color);
}

.note-item.dato-type {
    border-left-color: var(--dato-color);
}

.note-title {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.note-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    font-size: 0.9rem;
}

.note-type {
    padding: 0.2rem 0.5rem;
    background: #f1f2f6;
    border-radius: 3px;
}

.note-date {
    color: #666;
}

.note-item p {
    margin-bottom: 1rem;
}

.note-item button {
    background: #e74c3c;
    color: white;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9rem;
}

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

@media screen and (min-width: 480px) {
    .container {
        padding: 2rem;
    }

    .auth-card {
        padding: 2rem;
    }

    .button-group {
        flex-direction: row;
    }
}

@media screen and (max-width: 480px) {
    .notes-header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .notes-input textarea {
        min-height: 100px;
    }

    .btn {
        width: 100%;
        margin-bottom: 0.5rem;
    }

    .note-item {
        padding: 1rem;
    }
}

@media screen and (max-width: 360px) {
    html {
        font-size: 14px;
    }

    .input-group input {
        padding: 0.6rem;
    }

    .container {
        padding: 0.8rem;
    }
}