:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #e74c3c;
    --background-color: #ecf0f1;
    --text-color: #2c3e50;
    --card-bg: #ffffff;
    --font-main: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-japanese: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
}

body {
    font-family: var(--font-japanese), var(--font-main);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
    margin-bottom: 2rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    /* Allow wrapping */
}

header h1 {
    margin: 0;
    font-size: 1.5rem;
    flex-shrink: 0;
    /* Prevent title shrinking */
}

header nav {
    display: flex;
    align-items: center;
    gap: 10px;
    /* Space between items */
}

header nav span {
    margin-right: 10px;
    font-size: 0.9rem;
    opacity: 0.9;
}

header nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    display: inline-block;
    padding: 10px 15px;
    /* Larger touch target */
    border-radius: 5px;
    background-color: rgba(255, 255, 255, 0.2);
    /* Default button bg */
    transition: all 0.2s;
}

header nav a:hover {
    background-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-1px);
}

/* Specific colors via classes (to be added to HTML) */
.btn-nav-portal {
    background-color: #3498db !important;
}

.btn-nav-game {
    background-color: #f39c12 !important;
}

.btn-nav-add {
    background-color: #27ae60 !important;
}

.btn-nav-logout {
    background-color: #7f8c8d !important;
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        align-items: stretch;
        gap: 15px;
    }

    header nav {
        flex-direction: column;
        /* Stack buttons on mobile */
        width: 100%;
        gap: 10px;
    }

    header nav span {
        margin: 0 0 10px 0;
        text-align: center;
        display: block;
    }

    header nav a {
        width: 100%;
        /* Full width buttons */
        text-align: center;
        margin: 0;
        /* Remove margin-left if any */
        box-sizing: border-box;
        /* Include padding in width */
    }
}

.card {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

h2 {
    color: var(--secondary-color);
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
    margin-top: 0;
}

form {
    display: flex;
    flex-direction: column;
}

label {
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="text"],
input[type="password"],
textarea {
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

button:hover {
    background-color: var(--secondary-color);
}

.word-item {
    border-bottom: 1px solid #eee;
    padding: 15px 0;
}

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

.word-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.word-term {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.word-source {
    font-size: 0.9rem;
    color: #7f8c8d;
}

.word-meaning {
    margin: 10px 0;
    font-style: italic;
    background: #f9f9f9;
    padding: 10px;
    border-left: 3px solid var(--accent-color);
}

.word-sentence {
    color: #555;
}

.alert {
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

/* Filters */
.filters {
    display: flex;
    gap: 10px;
}

.filter-btn {
    text-decoration: none;
    color: var(--primary-color);
    padding: 5px 10px;
    border: 1px solid var(--primary-color);
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all 0.3s;
}

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

/* Badges */
.badge {
    font-size: 0.8rem;
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: 10px;
    color: white;
    vertical-align: middle;
}

.badge-en-ja {
    background-color: #e67e22;
}

.badge-en-en {
    background-color: #3498db;
}

.badge-mixed {
    background-color: #9b59b6;
}

/* Rich Meanings */
.meaning-en-en .phonetic {
    font-family: monospace;
    color: #888;
    margin-bottom: 5px;
    display: block;
}

.meaning-en-en .part-of-speech {
    font-weight: bold;
    font-style: italic;
    color: #555;
    margin-top: 10px;
}

.meaning-en-en .definitions {
    margin: 5px 0 0 20px;
    padding: 0;
}

.meaning-en-en .definitions li {
    margin-bottom: 5px;
}

.meaning-en-en .example {
    color: #7f8c8d;
    font-style: italic;
    font-size: 0.9rem;
    margin-top: 2px;
}

.meaning-en-ja .jp-header {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.meaning-en-ja .jp-word {
    font-weight: bold;
    color: var(--primary-color);
}

.meaning-en-ja .senses {
    list-style: none;
    padding: 0;
    margin: 0;
}

.meaning-en-ja .senses li {
    margin-bottom: 5px;
}

.meaning-en-ja .pos-tag {
    background: #eee;
    font-size: 0.75rem;
    padding: 1px 5px;
    border-radius: 4px;
    color: #666;
    margin-right: 5px;
}

.entry-divider {
    border: 0;
    border-top: 1px dashed #ccc;
    margin: 15px 0;
}

/* Filtered View Modes */
.view-mode-en-ja .meaning-en-en {
    display: none;
}

.view-mode-en-ja .meaning-en-ja .senses {
    display: none !important;
}

.view-mode-en-en .meaning-en-ja {
    display: none;
}

.btn-remove {
    background-color: #e74c3c;
    color: white;
    border: none;
    padding: 2px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: background-color 0.3s;
}

.btn-remove:hover {
    background-color: #c0392b;
}