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

:root {
    --bg: #f5f0e8;
    --accent: #c0622a;
    --text: #3b2e1e;
    --secondary: #7a9e7e;
    --white: #fff;
    --correct: #4a9e5c;
    --wrong: #c44;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* HEADER */
.header {
    text-align: center;
    padding: 2rem 1.5rem 1.5rem;
}

.back-link {
    display: inline-block;
    font-size: 0.85rem;
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 1rem;
}

.back-link:hover {
    text-decoration: underline;
}

.header h1 {
    font-family: 'Fraunces', serif;
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.subtitle {
    font-size: 0.95rem;
    opacity: 0.5;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    font-weight: 300;
}

/* TRAINER */
.trainer {
    flex: 1;
    max-width: 480px;
    width: 100%;
    margin: 0 auto;
    padding: 0 1.5rem 2rem;
}

/* CATEGORIES */
.categories {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.cat-btn {
    padding: 0.4rem 0.9rem;
    border: 1.5px solid rgba(59, 46, 30, 0.15);
    border-radius: 20px;
    background: transparent;
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s;
}

.cat-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.cat-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--white);
}

/* MODE TOGGLE */
.mode-toggle {
    display: flex;
    justify-content: center;
    gap: 0;
    margin-bottom: 1.25rem;
    background: rgba(59, 46, 30, 0.06);
    border-radius: 8px;
    padding: 3px;
}

.mode-btn {
    flex: 1;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    background: transparent;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
    opacity: 0.5;
    cursor: pointer;
    transition: all 0.2s;
}

.mode-btn.active {
    background: var(--white);
    opacity: 1;
    box-shadow: 0 1px 4px rgba(59, 46, 30, 0.1);
}

.mode-btn:hover:not(.active) {
    opacity: 0.7;
}

/* PROGRESS */
.progress-bar {
    height: 4px;
    background: rgba(59, 46, 30, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 0.4rem;
}

.progress-fill {
    height: 100%;
    background: var(--secondary);
    border-radius: 2px;
    transition: width 0.4s ease;
    width: 0%;
}

.progress-text {
    font-size: 0.75rem;
    opacity: 0.4;
    text-align: right;
    margin-bottom: 1.25rem;
}

/* CARD */
.card {
    background: var(--white);
    border-radius: 12px;
    padding: 2rem 1.5rem;
    text-align: center;
    box-shadow: 0 2px 20px rgba(59, 46, 30, 0.08);
    margin-bottom: 1.25rem;
    position: relative;
    min-height: 180px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.card-direction {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.card-word {
    font-family: 'Fraunces', serif;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
    line-height: 1.2;
}

.card-phonetic {
    font-size: 0.9rem;
    opacity: 0.5;
    font-style: italic;
    margin-bottom: 0.75rem;
}

.card-hint {
    font-size: 0.78rem;
    color: var(--secondary);
    background: rgba(122, 158, 126, 0.1);
    padding: 0.3rem 0.7rem;
    border-radius: 4px;
    margin-bottom: 0.6rem;
    font-weight: 500;
}

.card.sentence-mode .card-word {
    font-size: 1.35rem;
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    line-height: 1.5;
}

.speak-btn {
    background: none;
    border: 2px solid rgba(59, 46, 30, 0.12);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--accent);
    transition: all 0.2s;
}

.speak-btn:hover {
    border-color: var(--accent);
    background: rgba(192, 98, 42, 0.06);
}

.speak-btn.speaking {
    border-color: var(--accent);
    background: rgba(192, 98, 42, 0.1);
    animation: pulse 0.8s ease infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.08); }
}

/* CONJUGATION */
.conj-section {
    margin-bottom: 1.25rem;
}

.conj-toggle {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
    font-family: 'Fraunces', serif;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent);
    padding: 0.6rem 0;
    list-style: none;
    transition: opacity 0.2s;
}

.conj-toggle::-webkit-details-marker {
    display: none;
}

.conj-toggle::before {
    content: '▸';
    font-size: 0.75rem;
    transition: transform 0.2s;
    display: inline-block;
}

.conj-section[open] .conj-toggle::before {
    transform: rotate(90deg);
}

.conj-toggle:hover {
    opacity: 0.7;
}

.conj-tables {
    animation: conj-open 0.25s ease;
}

@keyframes conj-open {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}

.conj-tense {
    margin-bottom: 0.75rem;
}

.conj-tense-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--secondary);
    margin-bottom: 0.3rem;
}

.conj-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.15rem 0.75rem;
    background: var(--white);
    border-radius: 6px;
    padding: 0.6rem 0.8rem;
    box-shadow: 0 1px 8px rgba(59, 46, 30, 0.06);
    font-size: 0.82rem;
}

.conj-person {
    opacity: 0.45;
    font-size: 0.75rem;
    line-height: 1.8;
}

.conj-form {
    font-weight: 500;
    line-height: 1.8;
}

/* ANSWER */
.answer-area {
    margin-bottom: 1rem;
}

.input-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

#answer-input {
    flex: 1;
    padding: 0.85rem 1rem;
    font-size: 1.1rem;
    font-family: inherit;
    border: 2px solid rgba(59, 46, 30, 0.15);
    border-radius: 8px;
    background: var(--white);
    color: var(--text);
    transition: border-color 0.2s;
}

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

#answer-input.correct {
    border-color: var(--correct);
    background: rgba(74, 158, 92, 0.05);
}

#answer-input.wrong {
    border-color: var(--wrong);
    background: rgba(204, 68, 68, 0.05);
}

.mic-btn {
    width: 48px;
    height: 48px;
    border: 2px solid rgba(59, 46, 30, 0.15);
    border-radius: 8px;
    background: var(--white);
    color: var(--text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.mic-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.mic-btn.listening {
    border-color: var(--wrong);
    color: var(--wrong);
    animation: pulse 0.8s ease infinite;
}

.mic-btn.unavailable {
    opacity: 0.3;
    pointer-events: none;
}

.check-btn {
    width: 100%;
    padding: 0.85rem;
    font-size: 1rem;
    font-family: inherit;
    font-weight: 600;
    background: var(--accent);
    color: var(--white);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.check-btn:hover {
    background: #a8531f;
}

.check-btn:active {
    transform: scale(0.98);
}

/* FEEDBACK */
.feedback {
    text-align: center;
    padding: 1.25rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    animation: fade-in 0.25s ease;
}

.feedback.is-correct {
    background: rgba(74, 158, 92, 0.1);
    border: 1.5px solid rgba(74, 158, 92, 0.2);
}

.feedback.is-wrong {
    background: rgba(204, 68, 68, 0.08);
    border: 1.5px solid rgba(204, 68, 68, 0.15);
}

@keyframes fade-in {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.feedback-icon {
    font-size: 1.8rem;
    margin-bottom: 0.3rem;
}

.feedback-text {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.feedback-correct {
    font-size: 0.9rem;
    opacity: 0.7;
}

/* NEXT */
.next-btn {
    width: 100%;
    padding: 0.85rem;
    font-size: 1rem;
    font-family: inherit;
    font-weight: 500;
    background: var(--secondary);
    color: var(--white);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    margin-bottom: 1.5rem;
}

.next-btn:hover {
    background: #6a8e6e;
}

.next-btn:active {
    transform: scale(0.98);
}

/* STATS */
.stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(59, 46, 30, 0.08);
}

.stat {
    text-align: center;
}

.stat-num {
    display: block;
    font-family: 'Fraunces', serif;
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-label {
    font-size: 0.75rem;
    opacity: 0.5;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* RESET */
.reset-btn {
    display: block;
    margin: 0 auto;
    background: none;
    border: none;
    font-family: inherit;
    font-size: 0.8rem;
    color: var(--text);
    opacity: 0.35;
    cursor: pointer;
    text-decoration: underline;
}

.reset-btn:hover {
    opacity: 0.6;
}

/* FOOTER */
.footer {
    text-align: center;
    padding: 2rem 1.5rem;
    font-size: 0.85rem;
    opacity: 0.4;
}

.footer a {
    color: var(--accent);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* RESPONSIVE */
@media (max-width: 400px) {
    .card-word {
        font-size: 1.6rem;
    }
}