.dashboard-btn.learned-verbs-btn {
    background: linear-gradient(135deg, rgba(74, 222, 128, 0.11), rgba(22, 101, 52, 0.05));
    border-color: rgba(74, 222, 128, 0.24);
}

.dashboard-btn.practice-verbs-btn {
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.12), rgba(217, 119, 6, 0.05));
    border-color: rgba(251, 191, 36, 0.28);
}

.verb-categories-container {
    width: min(760px, calc(100% - 2rem));
    margin: 0 auto;
    padding: 1rem 0 3rem;
}

.verb-category-column {
    min-width: 0;
    padding: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 18px;
    background: rgba(18, 18, 24, 0.82);
}

.verb-category-column.learned-column {
    border-color: rgba(74, 222, 128, 0.18);
}

.verb-category-column.practice-column {
    border-color: rgba(251, 191, 36, 0.22);
}

.verb-category-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
    padding: 0.2rem 0.15rem 0.9rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.verb-category-head h3 {
    margin: 0.2rem 0 0;
    font-size: 1.2rem;
}

.verb-category-kicker {
    color: var(--text-secondary);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.11em;
    text-transform: uppercase;
}

.learned-column .verb-category-kicker {
    color: var(--success-color);
}

.practice-column .verb-category-kicker {
    color: var(--accent-color);
}

.verb-category-total {
    display: grid;
    place-items: center;
    min-width: 42px;
    height: 42px;
    padding: 0 0.7rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.06);
    font-size: 1rem;
    font-weight: 800;
}

.verb-category-list {
    display: grid;
    gap: 0.65rem;
}

.verb-category-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem;
    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.025);
}

.verb-category-copy {
    display: grid;
    flex: 1;
    min-width: 0;
    gap: 0.25rem;
}

.verb-category-copy strong {
    color: var(--text-primary);
    font-size: 0.9rem;
    line-height: 1.3;
}

.verb-category-copy span {
    color: var(--text-secondary);
    font-size: 0.75rem;
    line-height: 1.45;
}

.verb-category-copy small {
    color: rgba(251, 191, 36, 0.8);
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.verb-now-known-btn,
.verb-forgot-btn {
    flex: 0 0 auto;
    padding: 0.55rem 0.7rem;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.7rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s, transform 0.2s;
}

.verb-now-known-btn {
    border: 1px solid rgba(74, 222, 128, 0.32);
    background: rgba(74, 222, 128, 0.08);
    color: #86efac;
}

.verb-forgot-btn {
    border: 1px solid rgba(251, 191, 36, 0.3);
    background: rgba(251, 191, 36, 0.07);
    color: #fbbf24;
}

.verb-now-known-btn:hover,
.verb-forgot-btn:hover {
    transform: translateY(-1px);
}

.verb-now-known-btn:hover {
    background: rgba(74, 222, 128, 0.15);
}

.verb-forgot-btn:hover {
    background: rgba(251, 191, 36, 0.14);
}

.verb-practice-group {
    display: grid;
    gap: 0.55rem;
    padding: 0.75rem;
    border: 1px solid rgba(251, 191, 36, 0.16);
    border-radius: 14px;
    background: rgba(251, 191, 36, 0.025);
}

.verb-practice-group-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.15rem 0.1rem 0.35rem;
}

.verb-practice-group-head strong {
    color: var(--accent-color);
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.verb-practice-group-head span {
    color: var(--text-secondary);
    font-size: 0.72rem;
}

.practice-these-verbs-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    margin-top: 0.15rem;
    padding: 0.75rem 0.85rem;
    border: 1px solid rgba(251, 191, 36, 0.38);
    border-radius: 10px;
    background: rgba(251, 191, 36, 0.09);
    color: #fbbf24;
    font-family: inherit;
    font-size: 0.78rem;
    font-weight: 800;
    cursor: pointer;
}

.practice-these-verbs-btn:hover {
    background: rgba(251, 191, 36, 0.16);
}

.verb-category-empty {
    padding: 2rem 1rem;
    border: 1px dashed rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 0.82rem;
    line-height: 1.5;
    text-align: center;
}

.verb-category-quiz-open {
    overflow: hidden;
}

.verb-category-quiz-overlay {
    position: fixed;
    inset: 0;
    z-index: 10020;
    display: grid;
    place-items: center;
    padding: 1rem;
    background: rgba(3, 3, 6, 0.86);
    backdrop-filter: blur(10px);
}

.verb-category-quiz-overlay.hidden {
    display: none;
}

.verb-category-quiz-modal {
    position: relative;
    width: min(600px, 100%);
    max-height: min(88vh, 760px);
    overflow-y: auto;
    padding: 1.25rem;
    border: 1px solid rgba(251, 191, 36, 0.3);
    border-radius: 20px;
    background: #121218;
    box-shadow: 0 28px 80px rgba(0, 0, 0, 0.55);
}

.verb-category-quiz-close {
    position: absolute;
    top: 0.65rem;
    right: 0.75rem;
    z-index: 1;
    width: 36px;
    height: 36px;
    border: 0;
    background: transparent;
    color: var(--text-secondary);
    font-size: 1.7rem;
    cursor: pointer;
}

.verb-category-quiz-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.2rem 2.4rem 1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.verb-category-quiz-head span,
.verb-category-quiz-results > span {
    color: var(--accent-color);
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.verb-category-quiz-head h2 {
    margin: 0.3rem 0 0;
    font-size: 1.25rem;
}

.verb-category-quiz-head > strong {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.verb-category-quiz-question {
    padding: 1.4rem 0 1rem;
    color: var(--text-primary);
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.55;
}

.verb-category-quiz-options {
    display: grid;
    gap: 0.6rem;
}

.verb-category-quiz-options button {
    width: 100%;
    padding: 0.8rem 0.9rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.035);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    line-height: 1.4;
    text-align: left;
    cursor: pointer;
}

.verb-category-quiz-options button:not(:disabled):hover {
    border-color: rgba(251, 191, 36, 0.45);
    background: rgba(251, 191, 36, 0.08);
}

.verb-category-quiz-options button.correct {
    border-color: rgba(74, 222, 128, 0.55);
    background: rgba(74, 222, 128, 0.14);
}

.verb-category-quiz-options button.incorrect {
    border-color: rgba(239, 68, 68, 0.55);
    background: rgba(239, 68, 68, 0.14);
}

.verb-category-quiz-feedback {
    display: grid;
    gap: 0.35rem;
    margin-top: 0.85rem;
    padding: 0.8rem;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.04);
}

.verb-category-quiz-feedback.hidden,
.verb-category-quiz-next.hidden,
.verb-category-quiz-results.hidden {
    display: none;
}

.verb-category-quiz-feedback strong {
    color: var(--accent-color);
    font-size: 0.85rem;
}

.verb-category-quiz-feedback span {
    color: var(--text-secondary);
    font-size: 0.78rem;
    line-height: 1.5;
}

.verb-category-quiz-feedback b {
    color: var(--text-primary);
}

.verb-category-quiz-next,
.verb-category-quiz-results button {
    width: 100%;
    margin-top: 0.85rem;
    padding: 0.85rem;
    border: 0;
    border-radius: 10px;
    background: linear-gradient(135deg, #fbbf24, #d97706);
    color: #171109;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 800;
    cursor: pointer;
}

.verb-category-quiz-results {
    display: grid;
    justify-items: center;
    gap: 0.65rem;
    padding: 2.5rem 0.25rem 0.5rem;
    text-align: center;
}

.verb-category-quiz-results strong {
    color: var(--accent-color);
    font-size: 3.2rem;
}

.verb-category-quiz-results p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

@media (max-width: 480px) {
    .verb-category-row {
        align-items: flex-start;
    }

    .verb-now-known-btn,
    .verb-forgot-btn {
        padding: 0.5rem 0.55rem;
        font-size: 0.64rem;
    }

    .verb-category-quiz-modal {
        padding: 1rem;
        border-radius: 16px;
    }
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0b0b0f;
    --secondary-color: #101016;
    --accent-color: #fbbf24;
    --success-color: #4ade80;
    --error-color: #f87171;
    --text-primary: #f4f4f6;
    --text-secondary: #a2a2b0;
    --card-bg: #14141b;
    --hover-color: #24242f;
    --border-color: #272733;
}

body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    -webkit-font-smoothing: antialiased;
    background-color: var(--primary-color);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

header {
    background-color: var(--secondary-color);
    padding: 1rem 1.5rem;
    box-shadow: 0 2px 10px rgba(255, 255, 255, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.brand h1 {
    font-size: 1.5rem;
    margin-bottom: 0.2rem;
    background: linear-gradient(135deg, var(--accent-color), #2ecc71);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand .course-name {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 300;
}

.screen {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.screen.active {
    display: block;
}

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

.welcome-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 100px);
    padding: 2rem;
}

.welcome-container h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.welcome-container input {
    width: 100%;
    max-width: 400px;
    padding: 0.9rem;
    font-size: 1rem;
    background-color: var(--card-bg);
    border: 2px solid var(--hover-color);
    border-radius: 8px;
    color: var(--text-primary);
    margin-bottom: 1.2rem;
    transition: border-color 0.3s;
}

.welcome-container input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.welcome-container button {
    padding: 0.9rem 2.5rem;
    font-size: 1rem;
    background: linear-gradient(135deg, var(--accent-color), #2ecc71);
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.welcome-container button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(52, 152, 219, 0.4);
}

.dashboard-container {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.welcome-message h2 {
    font-size: 1.6rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.main-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.secondary-info {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 2rem;
    padding: 0 1rem;
}

.lessons-count {
    display: none;
}

.cert-btn {
    max-width: 300px;
}

.progress-section {
    margin-top: 1rem;
    margin-bottom: 2rem;
}

.progress-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
}

.progress-card h3 {
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
}

.progress-bar {
    width: 100%;
    height: 30px;
    background-color: var(--hover-color);
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), #2ecc71);
    transition: width 0.5s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

#progressText {
    text-align: center;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.stat-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--accent-color), #2ecc71);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.dashboard-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.dashboard-btn {
    padding: 1.5rem;
    font-size: 1.1rem;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 1rem;
    font-weight: 600;
    text-align: left;
}

.btn-content {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    flex: 1;
}

.btn-title {
    font-size: 1.1rem;
    font-weight: 600;
}

.btn-desc {
    font-size: 0.85rem;
    font-weight: 400;
    opacity: 0.85;
}

.dashboard-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(255, 255, 255, 0.2);
}

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

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

.dashboard-btn.success {
    background-color: var(--card-bg);
    color: white;
}

.dashboard-btn.upload {
    background: linear-gradient(135deg, #f39c12, #e67e22);
    color: white;
}

.upload-link-container {
    text-align: center;
    margin-top: 1rem;
}

.upload-link {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    text-decoration: underline;
    padding: 0.5rem 1rem;
    transition: color 0.2s;
}

.upload-link:hover {
    color: var(--text-primary);
}

.btn-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.screen-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    padding: 1rem 2rem;
    background-color: var(--secondary-color);
}

.screen-header h2 {
    font-size: 1.8rem;
    flex: 1;
    text-align: center;
}

.back-btn {
    padding: 0.7rem 1.5rem;
    background-color: var(--card-bg);
    border: none;
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.back-btn:hover {
    background-color: var(--hover-color);
}

.lessons-container {
    padding: 2rem;
}

.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.lesson-item {
    background-color: var(--card-bg);
    padding: 2rem 1rem;
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
}

.lesson-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(52, 152, 219, 0.3);
}

.lesson-item.completed {
    background: linear-gradient(135deg, #2ecc71, #27ae60);
}

.lesson-item.completed::after {
    content: '✓';
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 1.5rem;
    color: white;
}

.lesson-number {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.lesson-status {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.lesson-item.completed .lesson-status {
    color: white;
}

.lesson-container {
    padding: 2rem;
    min-height: calc(100vh - 100px);
}

.card-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 250px);
}

.phrasal-card {
    background-color: var(--card-bg);
    width: 100%;
    max-width: 450px;
    min-height: 240px;
    border-radius: 15px;
    padding: 1.2rem;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: slideFromRight 0.4s ease-out;
    position: relative;
}

@keyframes slideFromRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.phrasal-card:hover {
    transform: scale(1.02);
    box-shadow: 0 15px 50px rgba(52, 152, 219, 0.4);
}

.card-content {
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}

.phrasal-verb {
    font-size: 1.5rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--accent-color), #2ecc71);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
}

.definition {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: center;
    font-style: italic;
    padding: 0.5rem;
    border-left: 3px solid var(--accent-color);
    background-color: rgba(52, 152, 219, 0.1);
}

.examples {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.example {
    font-size: 0.8rem;
    padding: 0.5rem;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 6px;
    line-height: 1.3;
    color: var(--text-primary);
}

.example::before {
    content: '';
}

.card-hint {
    display: none;
}

@keyframes pulse {
    display: none;
}

.card-navigation {
    display: none;
}

.nav-btn {
    display: none;
}

#cardProgress {
    color: var(--text-secondary);
    font-size: 1rem;
}

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

.question-card {
    background-color: var(--card-bg);
    padding: 0.8rem;
    border-radius: 10px;
    margin-bottom: 0.8rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.question-text {
    font-size: 0.9rem;
    margin-bottom: 0.8rem;
    line-height: 1.3;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option {
    padding: 0.6rem;
    background-color: var(--secondary-color);
    border: 2px solid var(--hover-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.85rem;
}

.option:hover {
    background-color: var(--hover-color);
    border-color: var(--accent-color);
}

.option.selected {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.option.correct {
    background-color: var(--success-color);
    border-color: var(--success-color);
    animation: correctPulse 0.5s;
}

.option.incorrect {
    background-color: var(--error-color);
    border-color: var(--error-color);
    animation: shake 0.5s;
}

.option.idk-selected {
    background-color: rgba(251,191,36,.15);
    border-color: rgba(251,191,36,.5);
    color: #fbbf24;
    animation: correctPulse 0.5s;
}

@keyframes correctPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-10px);
    }
    75% {
        transform: translateX(10px);
    }
}

.submit-btn {
    width: 100%;
    padding: 1.2rem;
    font-size: 1.2rem;
    background: linear-gradient(135deg, var(--accent-color), #2980b9);
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: transform 0.2s;
    margin-top: 1rem;
}

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

.submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.feedback-card {
    background-color: var(--card-bg);
    padding: 0.8rem;
    border-radius: 10px;
    animation: slideIn 0.5s ease-out;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 0.5rem;
}

.feedback-card.hidden {
    display: none;
}

.feedback-content {
    text-align: center;
}

#feedbackTitle, #reviewFeedbackTitle {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.feedback-explanation {
    font-size: 0.85rem;
    margin-bottom: 0.8rem;
    padding: 0.7rem;
    background-color: var(--secondary-color);
    border-radius: 6px;
    line-height: 1.3;
}

.feedback-explanation strong {
    color: var(--accent-color);
    font-size: 1rem;
}

.next-btn {
    padding: 0.7rem 1.5rem;
    font-size: 0.95rem;
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: transform 0.2s;
}

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

.quiz-results, .review-complete {
    background-color: var(--card-bg);
    padding: 3rem;
    border-radius: 12px;
    text-align: center;
    animation: fadeIn 0.5s ease-out;
}

.quiz-results.hidden, .review-complete.hidden, .no-mistakes.hidden, .no-certificate.hidden {
    display: none;
}

.results-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.score-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.score-value {
    font-size: 4rem;
    font-weight: bold;
    background: linear-gradient(135deg, var(--accent-color), #2ecc71);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.score-label {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.no-mistakes, .no-certificate {
    background-color: var(--card-bg);
    padding: 3rem;
    border-radius: 12px;
    text-align: center;
}

.no-mistakes h2, .no-certificate h2 {
    margin-bottom: 1rem;
}

.no-mistakes p, .no-certificate p {
    margin-bottom: 2rem;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.certificate-container {
    padding: 2rem;
}

.certificate {
    max-width: 900px;
    margin: 2rem auto;
    background: white;
    padding: 3rem;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.certificate-border {
    border: 10px double var(--accent-color);
    padding: 3rem;
}

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

.certificate-header h2 {
    color: #2c3e50;
    font-size: 2.5rem;
}

.certificate-body {
    text-align: center;
}

.cert-text {
    color: #7f8c8d;
    font-size: 1.2rem;
    margin: 1rem 0;
}

.cert-name {
    color: #2c3e50;
    font-size: 2.5rem;
    margin: 1.5rem 0;
    font-weight: bold;
}

.cert-course {
    color: var(--accent-color);
    font-size: 2rem;
    margin: 1rem 0;
}

.cert-brand {
    color: #2ecc71;
    font-size: 1.8rem;
    margin: 1rem 0;
}

.cert-details {
    display: flex;
    justify-content: space-around;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid #ecf0f1;
}

.cert-detail {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.cert-label {
    color: #7f8c8d;
    font-size: 0.9rem;
}

.cert-detail span:last-child {
    color: #2c3e50;
    font-weight: bold;
    font-size: 1.1rem;
}

#certificateContent {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.upload-container {
    padding: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.upload-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.template-section, .upload-section {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
}

.template-section h3, .upload-section h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.template-section p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.template-box {
    position: relative;
}

.template-box pre {
    background-color: var(--secondary-color);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.copy-btn {
    padding: 0.8rem 1.5rem;
    background: linear-gradient(135deg, #9b59b6, #8e44ad);
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: transform 0.2s;
}

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

#jsonInput {
    width: 100%;
    min-height: 300px;
    padding: 1rem;
    background-color: var(--secondary-color);
    border: 2px solid var(--hover-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    resize: vertical;
    margin-bottom: 1rem;
}

#jsonInput:focus {
    outline: none;
    border-color: var(--accent-color);
}

.upload-btn {
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    font-size: 1.1rem;
    transition: transform 0.2s;
}

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

.upload-status {
    margin-top: 1rem;
    font-size: 1rem;
    text-align: center;
}

.upload-status.success {
    color: var(--success-color);
}

.upload-status.error {
    color: var(--error-color);
}

@media (max-width: 768px) {
    header {
        padding: 1rem;
    }

    .brand h1 {
        font-size: 1.5rem;
    }

    .brand .course-name {
        font-size: 0.9rem;
    }

    .welcome-container h2 {
        font-size: 2rem;
    }

    .dashboard-container {
        padding: 1rem;
    }

    .welcome-message h2 {
        font-size: 1.5rem;
    }

    .main-actions {
        grid-template-columns: 1fr;
    }

    .secondary-info {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }

    .cert-btn {
        max-width: 100%;
    }

    .lessons-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 1rem;
    }

    .phrasal-card {
        padding: 1.5rem;
        min-height: 300px;
        max-width: 100%;
    }

    .phrasal-verb {
        font-size: 1.8rem;
    }

    .definition {
        font-size: 1rem;
    }

    .example {
        font-size: 0.95rem;
    }

    .question-text {
        font-size: 1.1rem;
    }

    .option {
        padding: 0.9rem;
        font-size: 0.95rem;
    }

    .certificate {
        padding: 1.5rem;
    }

    .certificate-border {
        padding: 1.5rem;
    }

    .cert-name {
        font-size: 2rem;
    }

    .cert-course {
        font-size: 1.5rem;
    }

    .cert-details {
        flex-direction: column;
        gap: 1rem;
    }

    .screen-header {
        padding: 1rem;
    }

    .screen-header h2 {
        font-size: 1.3rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .phrasal-verb {
        font-size: 1.8rem;
    }

    .definition {
        font-size: 1rem;
    }

    .example {
        font-size: 0.95rem;
    }

    .score-value {
        font-size: 3rem;
    }
}

/* Index Screen */
.index-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.index-search-bar {
    margin: 20px 0;
}

.index-search-bar input {
    width: 100%;
    padding: 12px 16px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s;
}

.index-search-bar input:focus {
    border-color: var(--accent-color);
}

.index-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 65vh;
    overflow-y: auto;
}

.index-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.index-num {
    min-width: 36px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: right;
}

.index-verb {
    flex: 1;
    font-weight: 600;
    color: var(--text-primary);
}

.index-lesson-btn {
    padding: 5px 14px;
    background: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    white-space: nowrap;
    transition: opacity 0.2s;
}

.index-lesson-btn:hover {
    opacity: 0.85;
}

.no-results {
    text-align: center;
    color: var(--text-secondary);
    padding: 30px;
}

.dashboard-btn.learned-verbs-btn {
    border: 1px solid rgba(74, 222, 128, 0.24);
    background: linear-gradient(135deg, rgba(74, 222, 128, 0.11), rgba(22, 101, 52, 0.05));
    color: var(--text-primary);
}

.dashboard-btn.practice-verbs-btn {
    border: 1px solid rgba(251, 191, 36, 0.28);
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.12), rgba(217, 119, 6, 0.05));
    color: var(--text-primary);
}

.dashboard-btn.practice-verbs-btn .btn-title {
    font-size: 1.05rem;
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.dashboard-btn.learned-verbs-btn .btn-icon {
    color: #86efac;
}

.dashboard-btn.practice-verbs-btn .btn-icon {
    color: #fbbf24;
}

.dashboard-btn.learned-verbs-btn .btn-desc,
.dashboard-btn.practice-verbs-btn .btn-desc {
    color: var(--text-secondary);
    opacity: 1;
}