:root {
    --primary-color-light: #A8D8EA;
    --secondary-color-light: #F7CAC9;
    --tertiary-color-light: #C7F0DB;
    --background-color-light: #F9F7F7;
    --text-color-light: #3A3A3A;
    --border-color-light: #E0E0E0;
    --shadow-light: 0px 4px 6px rgba(0, 0, 0, 0.05);

    --primary-color-dark: #7FB3D5;
    --secondary-color-dark: #E6B8B7;
    --tertiary-color-dark: #A3D8C6;
    --background-color-dark: #2C2C2C;
    --text-color-dark: #F5F5F5;
    --border-color-dark: #444444;
    --shadow-dark: 0px 4px 6px rgba(0, 0, 0, 0.2);

    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-left: env(safe-area-inset-left, 0px);
    --safe-area-right: env(safe-area-inset-right, 0px);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color-light);
    color: var(--text-color-light);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--safe-area-top) var(--safe-area-right) var(--safe-area-bottom) var(--safe-area-left);
    min-height: 100vh;
    min-height: -webkit-fill-available;
    transition: background-color 0.3s, color 0.3s;
}

html {
    height: -webkit-fill-available;
}

.app-container {
    width: 100%;
    max-width: 450px;
    padding: calc(20px + var(--safe-area-top)) 20px calc(20px + var(--safe-area-bottom));
    margin: 0 auto;
    background-color: var(--background-color-light);
    border-radius: 20px;
    box-shadow: var(--shadow-light);
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: all 0.3s ease;
    min-height: 100vh;
    min-height: -webkit-fill-available;
    position: relative;
    overflow-x: hidden;
}

.screen {
    width: 100%;
    display: none;
    flex-direction: column;
    align-items: center;
    transition: display 0.3s;
}

.screen.active {
    display: flex;
}

.app-header {
    text-align: center;
    padding: max(16px, var(--safe-area-top)) 10px 10px;
}

.app-header h1,
.app-header h2 {
    font-size: 20px;
    font-weight: 600;
    margin: 0;
}

.back-btn {
    display: none;
}

.content {
    width: 100%;
    max-width: 100%;
    padding: 0 max(15px, var(--safe-area-left)) max(15px, var(--safe-area-bottom));
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow-x: hidden;
}

.btn {
    padding: 8px 28px;
    font-size: 16px;
    font-weight: 500;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.btn.small {
    padding: 8px 16px;
    font-size: 14px;
}

.btn.small.volver {
    padding: 8px 12px;
    width: 80px;
}

.primary {
    background-color: var(--primary-color-light);
    color: var(--text-color-light);
}

.secondary {
    background-color: var(--secondary-color-light);
    color: var(--text-color-light);
}

.tertiary {
    background-color: var(--tertiary-color-light);
    color: var(--text-color-light);
}

.quaternary {
    background-color: #9C27B0;
    color: white;
}

.quaternary:hover {
    background-color: #7B1FA2;
}

.form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
}

.form label {
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s;
}

.form input {
    padding: 12px;
    font-size: 16px;
    border: 2px solid var(--border-color-light);
    border-radius: 12px;
    background-color: white;
    transition: all 0.3s ease;
}

.form input:focus {
    border-color: var(--primary-color-light);
    box-shadow: 0 0 0 3px rgba(168, 216, 234, 0.2);
}

.import-section {
    margin: 4px 0;
    display: flex;
    gap: 4px;
    align-items: center;
}

.import-section .btn {
    padding: 4px 8px;
    font-size: 13px;
    height: 28px;
    flex: 1;
    min-width: 0;
}

.import-section label.btn {
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.import-section .btn.small {
    flex: 0.8;
}

.import-section .btn:nth-child(3) {
    flex: 0.7;
}

#csv-file {
    display: none;
}

.word-list-section {
    margin-top: 10px;
}

.word-list {
    list-style: none;
    padding: 0;
    max-height: 200px;
    overflow-y: auto;
    border: 2px solid var(--border-color-light);
    border-radius: 12px;
    background-color: white;
    margin: 8px 0;
}

.word-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px;
    border-bottom: 1px solid var(--border-color-light);
    transition: all 0.3s ease;
    font-size: 14px;
}

.word-list li:hover {
    background-color: rgba(168, 216, 234, 0.1);
}

.word-list button {
    background-color: var(--tertiary-color-light);
    color: white;
    padding: 4px 8px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: background-color 0.3s;
}

.word-list button:hover {
    background-color: #d97706;
}

.exercise-settings {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
}

.exercise-settings label {
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s;
}

.exercise-settings select {
    padding: 12px;
    font-size: 16px;
    border: 2px solid var(--border-color-light);
    border-radius: 12px;
    background-color: white;
    transition: all 0.3s ease;
}

.exercise-content {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
    font-size: 18px;
}

#question {
    font-size: 20px;
    font-weight: 500;
    text-align: center;
    transition: color 0.3s;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.options button {
    padding: 12px;
    font-size: 18px;
    border: 1px solid var(--border-color-light);
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.3s;
}

.options button:hover {
    background-color: #f0f0f0;
    border-color: var(--primary-color-light);
}

#answer-input {
    padding: 12px;
    font-size: 18px;
    border: 1px solid var(--border-color-light);
    border-radius: 8px;
    transition: border-color 0.3s;
}

#result-message {
    font-size: 16px;
    font-weight: 500;
    text-align: center;
    margin-top: 16px;
    transition: color 0.3s;
}

.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.correct {
    animation: correctAnimation 0.5s ease-in-out;
}

@keyframes correctAnimation {
    0% {
        transform: scale(1);
        background-color: #d4edda;
    }
    50% {
        transform: scale(1.1);
        background-color: #c3e6cb;
    }
    100% {
        transform: scale(1);
        background-color: #d4edda;
    }
}

.incorrect {
    animation: incorrectAnimation 0.5s ease-in-out;
}

@keyframes incorrectAnimation {
    0% {
        transform: scale(1);
        background-color: #f8d7da;
    }
    50% {
        transform: scale(1.1);
        background-color: #f5c6cb;
    }
    100% {
        transform: scale(1);
        background-color: #f8d7da;
    }
}

.exercise-summary {
    background-color: white;
    padding: 25px;
    border-radius: 20px;
    box-shadow: var(--shadow-light);
    width: 100%;
    max-width: 500px;
    margin: 20px auto;
    text-align: center;
}

.exercise-summary h3 {
    color: var(--text-color-light);
    margin-bottom: 20px;
    font-size: 24px;
    background: linear-gradient(135deg, var(--primary-color-light), var(--secondary-color-light));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.exercise-summary p {
    padding: 15px;
    margin: 10px 0;
    border-radius: 12px;
    font-size: 18px;
    background-color: rgba(168, 216, 234, 0.1);
    transition: all 0.3s ease;
}

.exercise-summary p:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

#summary-correct {
    color: #4CAF50;
    border-left: 4px solid #4CAF50;
}

#summary-incorrect {
    color: #F44336;
    border-left: 4px solid #F44336;
}

.stats-content {
    background-color: white;
    padding: 25px;
    border-radius: 20px;
    box-shadow: var(--shadow-light);
    width: 100%;
    max-width: 600px;
    margin: 20px auto;
    text-align: center;
}

.stats-content h3 {
    color: var(--text-color-light);
    margin-bottom: 20px;
    font-size: 24px;
    background: linear-gradient(135deg, var(--primary-color-light), var(--secondary-color-light));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.general-stats p,
.category-stats p,
.exercise-stats p {
    padding: 15px;
    margin: 10px 0;
    border-radius: 12px;
    font-size: 16px;
    background-color: rgba(168, 216, 234, 0.1);
    transition: all 0.3s ease;
}

.general-stats p:hover,
.category-stats p:hover,
.exercise-stats p:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

#category-list,
#exercise-list {
    list-style: none;
    padding: 0;
}

#category-list li,
#exercise-list li {
    padding: 15px;
    margin: 10px 0;
    border-radius: 12px;
    background-color: rgba(168, 216, 234, 0.1);
    transition: all 0.3s ease;
}

#category-list li:hover,
#exercise-list li:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

#most-incorrect-words-list {
    list-style: none;
    padding: 0;
}

#most-incorrect-words-list li {
    padding: 15px;
    margin: 10px 0;
    border-radius: 12px;
    background-color: rgba(168, 216, 234, 0.1);
    transition: all 0.3s ease;
}

#most-incorrect-words-list li:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.stats-navigation {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 25px;
}

.stats-navigation .btn {
    padding: 10px 20px;
    font-size: 14px;
}

body.dark-mode {
    background-color: var(--background-color-dark);
    color: var(--text-color-dark);
}

body.dark-mode .app-container {
    background-color: var(--background-color-dark);
    box-shadow: var(--shadow-dark);
}

body.dark-mode .back-btn {
    color: var(--primary-color-dark);
}

body.dark-mode .form label {
    color: var(--text-color-dark);
}

body.dark-mode .form input {
    color: var(--text-color-dark);
    background-color: var(--background-color-dark);
    border-color: var(--border-color-dark);
}

body.dark-mode .form input:focus {
    border-color: var(--primary-color-dark);
    box-shadow: 0 0 0 3px rgba(127, 179, 213, 0.2);
}

body.dark-mode .exercise-settings label {
    color: var(--text-color-dark);
}

body.dark-mode .exercise-settings select {
    color: var(--text-color-dark);
    background-color: var(--background-color-dark);
    border-color: var(--border-color-dark);
}

body.dark-mode .exercise-settings select:focus {
    border-color: var(--primary-color-dark);
    box-shadow: 0 0 0 3px rgba(127, 179, 213, 0.2);
}

body.dark-mode #question {
    color: var(--text-color-dark);
}

body.dark-mode .options button {
    color: var(--text-color-dark);
    background-color: var(--background-color-dark);
    border-color: var(--border-color-dark);
}

body.dark-mode .options button:hover {
    border-color: var(--primary-color-dark);
}

body.dark-mode #answer-input {
    color: var(--text-color-dark);
    background-color: var(--background-color-dark);
    border-color: var(--border-color-dark);
}

body.dark-mode #result-message {
    color: var(--text-color-dark);
}

body.dark-mode .exercise-summary h3 {
    color: var(--text-color-dark);
}

body.dark-mode .exercise-summary p {
    color: var(--text-color-dark);
}

body.dark-mode .progress-bar-container {
    background-color: #424242;
}

body.dark-mode .progress-bar {
    background-color: var(--primary-color-dark);
}

.theme-toggle {
    margin: 20px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
}

.theme-toggle label {
    font-size: 14px;
    color: var(--text-color-light);
    margin-right: 10px;
    cursor: pointer;
}

.theme-toggle input[type="checkbox"] {
    width: 40px;
    height: 20px;
    background-color: #ccc;
    border-radius: 10px;
    position: relative;
    appearance: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

.theme-toggle input[type="checkbox"]:checked {
    background-color: var(--primary-color-light);
}

.theme-toggle input[type="checkbox"]:before {
    content: '';
    width: 18px;
    height: 18px;
    background-color: white;
    border-radius: 50%;
    position: absolute;
    top: 1px;
    left: 1px;
    transition: left 0.3s;
}

.theme-toggle input[type="checkbox"]:checked:before {
    left: 21px;
}

body.dark-mode .theme-toggle label {
    color: var(--text-color-dark);
}

body.dark-mode .theme-toggle input[type="checkbox"] {
    background-color: #555;
}

body.dark-mode .theme-toggle input[type="checkbox"]:checked {
    background-color: var(--primary-color-dark);
}

body.dark-mode .theme-toggle input[type="checkbox"]:before {
    background-color: #333;
}

.stats-navigation {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 16px;
}

.stats-content {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.stats-content h3 {
    font-size: 20px;
    font-weight: 600;
    transition: color 0.3s;
}

.stats-content p {
    font-size: 16px;
    font-weight: 500;
    transition: color 0.3s;
}

.stats-content ul {
    list-style: none;
    padding: 0;
    width: 100%;
}

.stats-content li {
    padding: 10px;
    border-bottom: 1px solid var(--border-color-light);
    transition: border-bottom-color 0.3s;
}

.stats-content li:last-child {
    border-bottom: none;
}

body.dark-mode .stats-content li {
    border-bottom-color: var(--border-color-dark);
}

#import-loader {
    font-size: 14px;
    color: var(--tertiary-color-light);
}

.category-item {
    margin-bottom: 10px;
}

.category-header {
    background: linear-gradient(135deg, var(--primary-color-light), var(--secondary-color-light));
    color: white;
    border-radius: 12px;
    padding: 12px 16px;
    margin-bottom: 8px;
    transition: all 0.3s ease;
}

.category-header:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.toggle-icon {
    font-size: 18px;
}

.word-sublist {
    list-style: none;
    padding: 0;
    margin: 0;
    margin-top: 5px;
}

.word-sublist li {
    padding: 10px;
    border-bottom: 1px solid var(--border-color-light);
}

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

.word-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stats {
    display: flex;
    gap: 10px;
    align-items: center;
}

.stats .correct {
    color: #4CAF50;
}

.stats .incorrect {
    color: #F44336;
}

.stats .priority {
    color: #FF9800;
    font-weight: bold;
    padding: 2px 6px;
    border-radius: 4px;
    background-color: rgba(255, 152, 0, 0.1);
}

.dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    max-width: 90%;
    width: 400px;
}

.dialog.hidden {
    display: none;
}

.dialog-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

body.dark-mode .dialog {
    color: black;
}

.error-message {
    color: #ff4444;
    margin-top: 10px;
    font-weight: bold;
    text-align: center;
}

.logo {
    max-width: 150px;
    height: auto;
    margin-bottom: 1rem;
}

/* Mostrar solo el logo claro por defecto */
.light-logo {
    display: block;
}

.dark-logo {
    display: none;
}

/* Cambiar visibilidad en modo oscuro */
body.dark-mode .light-logo {
    display: none;
}

body.dark-mode .dark-logo {
    display: block;
}

#login-screen .form,
#register-screen .form {
    max-width: 400px;
    margin: 0 auto;
}

#animal-emoji {
    padding: 12px;
    font-size: 16px;
    border: 2px solid var(--border-color-light);
    border-radius: 12px;
    background-color: white;
    width: 100%;
    margin-bottom: 16px;
    transition: all 0.3s ease;
}

#animal-emoji:focus {
    border-color: var(--primary-color-light);
    box-shadow: 0 0 0 3px rgba(168, 216, 234, 0.2);
}

body.dark-mode #animal-emoji {
    border-color: var(--border-color-dark);
    background-color: var(--background-color-dark);
    color: var(--text-color-dark);
}

body.dark-mode #animal-emoji:focus {
    border-color: var(--primary-color-dark);
}

body.dark-mode .word-list {
    background-color: var(--background-color-dark);
    border-color: var(--border-color-dark);
}

body.dark-mode .word-list li {
    color: var(--text-color-dark);
    border-bottom-color: var(--border-color-dark);
}

body.dark-mode .word-list button {
    background-color: var(--primary-color-dark);
    color: var(--text-color-dark);
}

body.dark-mode .word-list button:hover {
    background-color: var(--secondary-color-dark);
}

.small-buttons-container {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

.btn.small {
    padding: 6px 12px;
    font-size: 14px;
}

.btn.small.reset {
    background-color: #ff4444;
    color: white;
}

.btn.small.edit {
    background-color: #4CAF50;
    color: white;
}

.btn.small.reset:hover {
    background-color: #cc0000;
}

.btn.small.edit:hover {
    background-color: #45a049;
}

body.dark-mode .stats-content {
    background-color: var(--background-color-dark);
    color: var(--text-color-dark);
}

body.dark-mode #most-incorrect-words-list li {
    background-color: #3a3a3a;
    color: var(--text-color-dark);
    padding: 15px;
    margin: 10px 0;
    border-radius: 12px;
    transition: all 0.3s ease;
}

body.dark-mode #most-incorrect-words-list li:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    background-color: #4a4a4a;
}

body.dark-mode .stats-content h3 {
    color: var(--text-color-dark);
    background: linear-gradient(135deg, var(--primary-color-dark), var(--secondary-color-dark));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

body.dark-mode #total-words,
body.dark-mode #total-exercises,
body.dark-mode #correct-percentage {
    color: var(--text-color-dark);
    background-color: #3a3a3a;
    padding: 15px;
    border-radius: 12px;
}

.debug-table {
    width: 100%;
    overflow-x: auto;
}

#debug-words-table {
    width: 100%;
    border-collapse: collapse;
}

#debug-words-table th,
#debug-words-table td {
    padding: 6px;
    text-align: left;
    font-size: 13px;
    border: 1px solid #ddd;
}

#debug-words-table .category-header {
    background-color: #f5f5f5;
    text-align: left;
    padding: 8px;
}

.dark-mode #debug-words-table .category-header {
    background-color: #2a2a2a;
}

.dark-mode #debug-words-table td {
    border-color: #444;
}

@media screen and (max-width: 768px) {
    .debug-table {
        padding: 8px;
        margin: 0 -15px;
        border-radius: 0;
    }

    #debug-words-table {
        min-width: 100%;
    }

    #debug-words-table th,
    #debug-words-table td {
        padding: 8px;
        font-size: 12px;
        white-space: nowrap;
    }

    .debug-table::after {
        content: '← Desliza →';
        display: block;
        text-align: center;
        padding: 10px;
        color: var(--text-color-light);
        font-size: 12px;
        background-color: rgba(0,0,0,0.05);
        margin-top: 8px;
        border-radius: 4px;
    }

    body.dark-mode .debug-table::after {
        color: var(--text-color-dark);
        background-color: rgba(255,255,255,0.1);
    }
}

#debug-words-table th {
    background-color: var(--primary-color-light);
    color: var(--text-color-light);
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 1;
}

#debug-words-table tr:hover {
    background-color: rgba(168, 216, 234, 0.1);
}

body.dark-mode .debug-table {
    background: var(--background-color-dark);
}

body.dark-mode #debug-words-table th {
    background-color: var(--primary-color-dark);
    color: var(--text-color-dark);
}

body.dark-mode #debug-words-table td {
    border-bottom-color: var(--border-color-dark);
}

body.dark-mode #debug-words-table tr:hover {
    background-color: #3a3a3a;
}

.btn.small.debug {
    background-color: #FF9800;
    color: white;
}

.btn.small.debug:hover {
    background-color: #F57C00;
}

.remember-user {
    display: flex;
    align-items: center;
    margin: 10px 0;
}

.remember-user input[type="checkbox"] {
    margin-right: 8px;
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.remember-user label {
    font-size: 14px;
    color: var(--text-color-light);
    cursor: pointer;
}

body.dark-mode .remember-user label {
    color: var(--text-color-dark);
}

.btn.logout {
    margin-top: 20px;
    background-color: #ff4444;
    color: white;
}

.btn.logout:hover {
    background-color: #cc0000;
}

.content .btn.secondary {
    margin-top: 20px;
}

.app-container .content .btn {
    margin: 10px 0;
}

.app-container .content .btn.primary,
.app-container .content .btn.secondary,
.app-container .content .btn.tertiary {
    margin: 10px 0;
}

#word-form.form {
    max-width: 300px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
}

#word-form.form input {
    padding: 20px;
    margin: 0 0 8px 0;
    font-size: 20px;
    height: 24px;
}

#word-form.form label {
    font-size: 13px;
    margin: 0;
    padding: 0;
    line-height: 1.2;
}

#word-form.form button {
    margin-top: 8px;
    padding: 6px 12px;
    height: 32px;
}

.import-section {
    margin: 4px 0;
    display: flex;
    gap: 4px;
    align-items: center;
}

.import-section .btn {
    padding: 4px 8px;
    font-size: 13px;
    height: 28px;
    flex: 1;
    min-width: 0;
}

.import-section label.btn {
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.import-section .btn.small {
    flex: 0.8;
}

.import-section .btn:nth-child(3) {
    flex: 0.7;
}

.word-list-section {
    margin-top: 4px;
}

.word-list-section h3 {
    font-size: 14px;
    margin: 4px 0;
}

.word-list {
    max-height: 150px;
    margin: 4px 0;
    padding: 4px;
    overflow-y: auto;
}

.word-list li {
    padding: 4px;
    font-size: 13px;
    margin: 2px 0;
}

.word-list button {
    padding: 2px 6px;
    font-size: 11px;
    margin: 0 2px;
}

.back-to-home {
    margin: 8px 0 4px 0;
    padding: 6px 12px;
    height: 32px;
}

#add-words-screen .app-header {
    margin-bottom: 8px;
    padding: 8px;
}

#add-words-screen .app-header h2 {
    font-size: 18px;
    margin: 0;
}

#add-words-screen .back-btn {
    padding: 4px 8px;
    font-size: 13px;
}

/* Ajustes para pantallas pequeñas */
@media screen and (max-width: 480px) {
    .btn {
        padding: 12px 20px;
        font-size: 14px;
    }

    .form input, .form select {
        font-size: 14px;
        padding: 8px;
    }

    .app-container {
        padding: 10px;
    }
}

/* Ajustes para pantallas muy pequeñas */
@media screen and (max-width: 320px) {
    .app-container {
        padding: calc(10px + var(--safe-area-top)) 10px calc(10px + var(--safe-area-bottom));
    }

    .btn {
        padding: 10px 16px;
        font-size: 13px;
    }

    .app-header h1,
    .app-header h2 {
        font-size: 18px;
    }
}

/* Ajustes para orientación horizontal */
@media screen and (orientation: landscape) and (max-height: 450px) {
    .app-container {
        min-height: auto;
        padding: calc(10px + var(--safe-area-top)) 15px;
    }

    .content {
        padding-bottom: 10px;
    }
}

/* Prevenir zoom en inputs en iOS */
@supports (-webkit-touch-callout: none) {
    input,
    select,
    textarea {
        font-size: 16px !important;
    }
}

/* Ajustes para dispositivos con notch más grande */
@supports (padding-top: constant(safe-area-inset-top)) {
    .app-container {
        padding-top: constant(safe-area-inset-top);
    }
}

@supports (padding-top: env(safe-area-inset-top)) {
    .app-container {
        padding-top: env(safe-area-inset-top);
    }
}

/* Estilos para la vista de debug con categorías desplegables */
.category-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.category-item {
    margin-bottom: 8px;
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color-light), var(--secondary-color-light));
    color: white;
    border-radius: 12px;
    padding: 12px 16px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.category-header:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.toggle-icon {
    font-size: 18px;
    font-weight: bold;
}

.word-sublist {
    list-style: none;
    padding: 0;
    margin: 8px 0;
    border-radius: 8px;
    overflow: hidden;
}

.word-sublist.hidden {
    display: none;
}

.word-sublist li {
    padding: 10px;
    border-bottom: 1px solid var(--border-color-light);
    background-color: var(--background-color-light);
}

.word-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stats {
    display: flex;
    gap: 10px;
}

.stats .correct {
    color: #4CAF50;
}

.stats .incorrect {
    color: #F44336;
}

/* Ajustes para modo oscuro */
body.dark-mode .category-header {
    background: linear-gradient(135deg, var(--primary-color-dark), var(--secondary-color-dark));
}

body.dark-mode .word-sublist li {
    background-color: var(--background-color-dark);
    border-bottom-color: var(--border-color-dark);
}

/* Ajustes para la prioridad */
.stats .priority {
    color: #FF9800;
    font-weight: bold;
    padding: 2px 6px;
    border-radius: 4px;
    background-color: rgba(255, 152, 0, 0.1);
}

/* Ajuste para modo oscuro */
body.dark-mode .stats .priority {
    background-color: rgba(255, 152, 0, 0.2);
}

/* Estilos específicos para el header de debug */
.debug-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    gap: 20px;
}

.debug-header h2 {
    margin: 0;
}

.debug-header .btn {
    padding: 6px 12px;
    font-size: 13px;
    height: 28px;
}

/* Estilos para las flashcards */
.flashcards-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.flashcard-container {
    perspective: 1000px;
    width: 300px;
    height: 200px;
}

.flashcard {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s;
    cursor: pointer;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.flashcard .front,
.flashcard .back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    border-radius: 10px;
    background-color: white;
}

.flashcard .back {
    transform: rotateY(180deg);
}

.flashcard-controls {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

/* Estilos para el modo normal de estudio */
.normal-study-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.study-card {
    width: 300px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    background-color: white;
    padding: 20px;
}

.word-translation-container {
    text-align: center;
}

.word {
    font-size: 24px;
    margin-bottom: 20px;
    font-weight: bold;
}

.translation {
    font-size: 20px;
    color: #666;
}

.study-controls {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

/* Estilos para el diálogo modal */
.modal-dialog {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-dialog.hidden {
    display: none;
}

.dialog-content {
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    max-width: 300px;
    width: 100%;
}

.dialog-buttons {
    display: flex;
    gap: 10px;
    margin-top: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.dialog-buttons .btn {
    margin: 5px;
    flex: 1 1 auto;
    min-width: 100px;
}

.tertiary {
    background-color: #6c757d;
    color: white;
}

.tertiary:hover {
    background-color: #5a6268;
}

/* Unificar completamente los estilos de los toggles */
.theme-toggle {
    margin: 20px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
}

.theme-toggle label {
    font-size: 14px;
    color: var(--text-color-light);
    margin-right: 10px;
    cursor: pointer;
}

.theme-toggle input[type="checkbox"] {
    width: 40px;
    height: 20px;
    background-color: #ccc;
    border-radius: 10px;
    position: relative;
    appearance: none;
    cursor: pointer;
    transition: background-color 0.3s;
}

.theme-toggle input[type="checkbox"]:checked {
    background-color: var(--primary-color-light);
}

.theme-toggle input[type="checkbox"]:before {
    content: '';
    width: 18px;
    height: 18px;
    background-color: white;
    border-radius: 50%;
    position: absolute;
    top: 1px;
    left: 1px;
    transition: left 0.3s;
}

.theme-toggle input[type="checkbox"]:checked:before {
    left: 21px;
}

body.dark-mode .theme-toggle label {
    color: var(--text-color-dark);
}

body.dark-mode .theme-toggle input[type="checkbox"] {
    background-color: #555;
}

body.dark-mode .theme-toggle input[type="checkbox"]:checked {
    background-color: var(--primary-color-dark);
}

body.dark-mode .theme-toggle input[type="checkbox"]:before {
    background-color: #333;
}

/* Estilos para los logos en la pantalla de login */
#login-screen .logo {
    max-width: 150px;
    height: auto;
    margin-bottom: 1rem;
}

#login-screen .light-logo {
    display: block;
}

#login-screen .dark-logo {
    display: none;
}

body.dark-mode #login-screen .light-logo {
    display: none;
}

body.dark-mode #login-screen .dark-logo {
    display: block;
}

/* Estilo para el botón de eliminar categoría dentro del listado */
.category-header button.delete-category {
    background-color: #ff4444;
    color: white;
    margin-left: 10px;
    padding: 2px 6px;
    font-size: 11px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.category-header button.delete-category:hover {
    background-color: #cc0000;
}

/* Ajustes para los textos en modo oscuro */
body.dark-mode .form label {
    color: var(--text-color-dark);
}

body.dark-mode .form input {
    color: var(--text-color-dark);
    background-color: var(--background-color-dark);
    border-color: var(--border-color-dark);
}

body.dark-mode .form input:focus {
    border-color: var(--primary-color-dark);
    box-shadow: 0 0 0 3px rgba(127, 179, 213, 0.2);
}

body.dark-mode .exercise-settings label {
    color: var(--text-color-dark);
}

body.dark-mode .exercise-settings select {
    color: var(--text-color-dark);
    background-color: var(--background-color-dark);
    border-color: var(--border-color-dark);
}

body.dark-mode .exercise-settings select:focus {
    border-color: var(--primary-color-dark);
    box-shadow: 0 0 0 3px rgba(127, 179, 213, 0.2);
}

body.dark-mode #question {
    color: var(--text-color-dark);
}

body.dark-mode .options button {
    color: var(--text-color-dark);
    background-color: var(--background-color-dark);
    border-color: var(--border-color-dark);
}

body.dark-mode .options button:hover {
    border-color: var(--primary-color-dark);
}

body.dark-mode #answer-input {
    color: var(--text-color-dark);
    background-color: var(--background-color-dark);
    border-color: var(--border-color-dark);
}

body.dark-mode #result-message {
    color: var(--text-color-dark);
}

body.dark-mode .exercise-summary h3 {
    color: var(--text-color-dark);
}

body.dark-mode .exercise-summary p {
    color: var(--text-color-dark);
}

body.dark-mode .stats-content {
    color: var(--text-color-dark);
}

body.dark-mode .stats-content h3 {
    color: var(--text-color-dark);
}

body.dark-mode .stats-content p {
    color: var(--text-color-dark);
}

body.dark-mode #most-incorrect-words-list li {
    color: var(--text-color-dark);
}

body.dark-mode .word-list {
    color: var(--text-color-dark);
}

body.dark-mode .word-list li {
    color: var(--text-color-dark);
}

body.dark-mode .word-list button {
    color: var(--text-color-dark);
    background-color: var(--primary-color-dark);
}

body.dark-mode .word-list button:hover {
    background-color: var(--secondary-color-dark);
}

body.dark-mode .category-header {
    color: var(--text-color-dark);
}

body.dark-mode .word-sublist li {
    color: var(--text-color-dark);
}

body.dark-mode .stats .correct {
    color: #4CAF50;
}

body.dark-mode .stats .incorrect {
    color: #F44336;
}

body.dark-mode .stats .priority {
    color: #FF9800;
}

body.dark-mode .debug-table {
    color: var(--text-color-dark);
}

body.dark-mode #debug-words-table th {
    color: var(--text-color-dark);
}

body.dark-mode #debug-words-table td {
    color: var(--text-color-dark);
}

body.dark-mode .modal-dialog .dialog-content {
    color: var(--text-color-dark);
    background-color: var(--background-color-dark);
}

body.dark-mode .modal-dialog .dialog-content .btn {
    color: var(--text-color-dark);
    background-color: var(--primary-color-dark);
}

body.dark-mode .modal-dialog .dialog-content .btn:hover {
    background-color: var(--secondary-color-dark);
}

body.dark-mode .theme-toggle label {
    color: var(--text-color-dark);
}

body.dark-mode .theme-toggle input[type="checkbox"] {
    background-color: #555;
}

body.dark-mode .theme-toggle input[type="checkbox"]:checked {
    background-color: var(--primary-color-dark);
}

body.dark-mode .theme-toggle input[type="checkbox"]:before {
    background-color: #333;
}

body.dark-mode .remember-user label {
    color: var(--text-color-dark);
}

body.dark-mode .btn.logout {
    color: white;
}

body.dark-mode .btn.logout:hover {
    background-color: #cc0000;
}

body.dark-mode .content .btn.secondary {
    color: var(--text-color-dark);
}

body.dark-mode .app-container .content .btn {
    color: var(--text-color-dark);
}

body.dark-mode .app-container .content .btn.primary,
body.dark-mode .app-container .content .btn.secondary,
body.dark-mode .app-container .content .btn.tertiary {
    color: var(--text-color-dark);
}

body.dark-mode #word-form.form input {
    color: var(--text-color-dark);
    background-color: var(--background-color-dark);
}

body.dark-mode #word-form.form label {
    color: var(--text-color-dark);
}

body.dark-mode .import-section .btn {
    color: var(--text-color-dark);
}

body.dark-mode .word-list-section h3 {
    color: var(--text-color-dark);
}

body.dark-mode .word-list li {
    color: var(--text-color-dark);
}

body.dark-mode .word-list button {
    color: var(--text-color-dark);
}

body.dark-mode .back-to-home {
    color: var(--text-color-dark);
}

body.dark-mode #add-words-screen .app-header h2 {
    color: var(--text-color-dark);
}

body.dark-mode #add-words-screen .back-btn {
    color: var(--text-color-dark);
}

body.dark-mode .category-header button.delete-category {
    color: white;
}

body.dark-mode .category-header button.delete-category:hover {
    background-color: #cc0000;
}

/* Ajustes para las flashcards en modo oscuro */
body.dark-mode .flashcard .front,
body.dark-mode .flashcard .back {
    color: var(--text-color-dark);
    background-color: var(--background-color-dark);
}

body.dark-mode .flashcard {
    background-color: var(--background-color-dark);
    border: 1px solid var(--border-color-dark);
}

body.dark-mode .flashcard-controls .btn {
    color: var(--text-color-dark);
    background-color: var(--primary-color-dark);
}

body.dark-mode .flashcard-controls .btn:hover {
    background-color: var(--secondary-color-dark);
}

body.dark-mode .study-card {
    background-color: var(--background-color-dark);
    border: 1px solid var(--border-color-dark);
}

body.dark-mode .study-card .word {
    color: var(--text-color-dark);
}

body.dark-mode .study-card .translation {
    color: var(--text-color-dark);
}

body.dark-mode .study-controls .btn {
    color: var(--text-color-dark);
    background-color: var(--primary-color-dark);
}

body.dark-mode .study-controls .btn:hover {
    background-color: var(--secondary-color-dark);
}

/* Ajuste para el botón "Volver" en la pantalla de ejercicios en modo oscuro */
body.dark-mode .btn.small.volver {
    color: black;
}