:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --secondary-color: #6B7280;
    --success-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --background: #F9FAFB;
    --surface: #FFFFFF;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

html {
    scroll-behavior: smooth;
    /* Prevent horizontal scroll on mobile */
    overflow-x: hidden;
    width: 100%;
}

body {
    /* Ensure proper mobile scaling */
    min-width: 320px;
    overflow-x: hidden;
    width: 100%;
    -webkit-text-size-adjust: 100%;
}

/* PWA specific fixes for mobile */
@media (display-mode: standalone) {
    body {
        /* Add safe area insets for notched devices */
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
    }
}

.nav {
    display: flex;
    gap: 0.5rem;
}

.user-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-name {
    font-weight: 600;
    color: var(--text-primary);
}

/* Auth View */
.auth-view {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: var(--background);
}

.auth-card {
    width: 100%;
    max-width: 480px;
    background: var(--surface);
    border-radius: 1rem;
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
}

.auth-header {
    margin-bottom: 1.5rem;
    text-align: center;
}

.auth-header h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--text-secondary);
}

.auth-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.auth-tab {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    background: transparent;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.auth-tab.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.auth-form .btn {
    width: 100%;
    justify-content: center;
}

.auth-tabs-modern {
    gap: 0.75rem;
}

.auth-tabs-modern .tab {
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 3rem;
}

.header-tabs .tab {
    min-width: 140px;
    justify-content: center;
}

.header-actions {
    flex-wrap: wrap;
}

/* nav tabs styled by daisyUI */

/* Main Content */
.main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 80px);
}

.view {
    display: none;
}

.view.active {
    display: block;
    animation: fadeIn 0.3s ease-in;
}

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

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

.view-header h2 {
    font-size: 2rem;
    font-weight: 700;
}

/* Cards */
.set-card,
.settings-card,
.learning-card,
.results-card {
    background: var(--surface);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow);
}

/* Sets List */
.sets-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.set-item {
    background: var(--surface);
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: all 0.2s;
    cursor: pointer;
    position: relative;
}

.set-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.set-item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.set-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.set-language {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.set-favorite {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.set-favorite.active {
    filter: grayscale(0);
}

.set-favorite:not(.active) {
    filter: grayscale(1);
    opacity: 0.3;
}

.set-stats {
    display: flex;
    justify-content: space-between;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.set-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
}

.set-actions .btn {
    flex: 1;
    justify-content: center;
}

/* Form Elements */
/* Legacy form styles removed in favor of daisyUI */

/* Vocabularies Container */
.vocabulary-item {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.vocabulary-item input {
    padding: 0.5rem;
}

.vocabulary-item .btn {
    padding: 0.5rem 1rem;
}

/* Mode Selection */
.mode-selection {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.mode-card {
    background: var(--surface);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.2s;
}

.mode-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.mode-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.mode-card h3 {
    margin-bottom: 0.5rem;
}

.mode-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* Learning Views */
.progress-info {
    font-weight: 600;
    color: var(--primary-color);
}

.word-display {
    text-align: center;
    padding: 3rem 2rem;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 2rem;
}

.language-label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.word-main {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.answer-section {
    text-align: center;
}

.answer-section label {
    display: block;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.answer-section input {
    margin-bottom: 1rem;
}

/* Feedback */
.feedback {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 0.5rem;
    text-align: center;
    font-weight: 500;
}

.feedback.correct {
    background: #D1FAE5;
    color: #065F46;
}

.feedback.wrong {
    background: #FEE2E2;
    color: #991B1B;
}

/* Speed Mode */
.speed-timer {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    color: var(--warning-color);
    background: rgba(245, 158, 11, 0.12);
    padding: 0.5rem 0.75rem;
    border-radius: 999px;
    margin-bottom: 1rem;
}

/* Listening Mode */
#play-listening-btn {
    margin-top: 1rem;
}

/* Quiz Mode */
.quiz-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.quiz-option {
    padding: 1rem 1.25rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    background: var(--surface);
    cursor: pointer;
    font-weight: 600;
    text-align: center;
    transition: all 0.2s;
}

.quiz-option:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.quiz-option.correct {
    border-color: var(--success-color);
    color: var(--success-color);
    background: rgba(16, 185, 129, 0.08);
}

.quiz-option.wrong {
    border-color: var(--danger-color);
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.08);
}

/* Flashcard */
.flashcard-container {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.flashcard {
    perspective: 1000px;
    margin-bottom: 2rem;
    min-height: 400px;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 400px;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

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

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: var(--surface);
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    padding: 2rem;
}

.flashcard-back {
    transform: rotateY(180deg);
    background: var(--primary-color);
    color: white;
}

.flashcard-back .language-label {
    color: rgba(255, 255, 255, 0.8);
}

.flashcard-back h2 {
    color: white;
}

.flashcard-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1rem;
}

/* Results */
.results-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.result-stat {
    text-align: center;
    padding: 1.5rem;
    border-radius: 0.5rem;
}

.result-correct {
    background: #D1FAE5;
}

.result-wrong {
    background: #FEE2E2;
}

.result-total {
    background: #DBEAFE;
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.results-details {
    margin-top: 2rem;
}

.button-group {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.results-details h3 {
    margin-bottom: 1rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
}

.result-item.correct {
    background: #D1FAE5;
}

.result-item.wrong {
    background: #FEE2E2;
}

.result-words {
    display: flex;
    gap: 1rem;
}

.result-icon {
    font-size: 1.25rem;
}

/* Toast container positioning (DaisyUI handles the rest) */
#toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 9999;
    max-width: calc(100vw - 2rem);
    pointer-events: none;
}

#toast-container .alert {
    pointer-events: auto;
    max-width: 400px;
    width: auto;
    min-width: 250px;
}

/* Mobile toast adjustments */
@media (max-width: 768px) {
    #toast-container {
        top: auto;
        bottom: 5rem;
        left: 1rem;
        right: 1rem;
    }
    
    #toast-container .alert {
        max-width: 100%;
        width: 100%;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }

    .header-right {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .user-area {
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .logo {
        text-align: center;
    }

    .view-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .sets-list {
        grid-template-columns: 1fr;
    }

    .mode-selection {
        grid-template-columns: 1fr;
    }

    .quiz-options {
        grid-template-columns: 1fr;
    }

    .vocabulary-item {
        grid-template-columns: 1fr;
    }

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

    .set-actions {
        flex-direction: column;
    }

    .flashcard-actions {
        flex-direction: column;
    }

    .flashcard {
        min-height: 300px;
    }

    .flashcard-inner {
        height: 300px;
    }

    .word-main {
        font-size: 1.75rem;
    }

    .learning-card,
    .results-card,
    .settings-card,
    .set-card {
        padding: 1.5rem;
    }

    .auth-card {
        padding: 2rem 1.5rem;
    }

    .auth-tabs-modern .tab {
        padding: 0.85rem 1rem;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .view-header h2 {
        font-size: 1.5rem;
    }

    .btn-large {
        padding: 0.85rem 1.25rem;
        font-size: 1rem;
    }

    .input-large {
        padding: 0.85rem;
        font-size: 1rem;
    }
}

/* Loading State */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

.loading::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% {
        content: '.';
    }
    40% {
        content: '..';
    }
    60%, 100% {
        content: '...';
    }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}