:root {
    --bg1: #46178f;
    --bg2: #2d0c57;
    --green: #2fb344;
    --red: #fa5252;
    --blue: #228be6;
    --yellow: #fab005;
    --shadow: 0 12px 30px rgba(0,0,0,.18);
}

* {
    box-sizing: border-box
}

body {
    margin: 0;
    font-family: Inter, Arial, Helvetica, sans-serif;
    color: #fff;
    background: radial-gradient(circle at top left, #6a1b9a 0%, transparent 30%), radial-gradient(circle at bottom right, #1e88e5 0%, transparent 25%), linear-gradient(135deg, var(--bg1), var(--bg2));
    min-height: 100vh;
}

.app {
    width: 100%;
    padding: 24px 40px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

.brand {
    font-size: 28px;
    font-weight: 900;
    letter-spacing: .5px;
}

.meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.pill {
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.25);
    padding: 10px 18px;
    border-radius: 999px;
    font-weight: 700;
    font-size: 16px;
    color: #fff;
    backdrop-filter: blur(10px);
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.2), 0 4px 12px rgba(0,0,0,0.2);
}


.screen {
    display: none;
}

    .screen.active {
        display: block;
    }

.panel {
    background: rgba(255,255,255,.1);
    border: 1px solid rgba(255,255,255,.16);
    border-radius: 28px;
    padding: 24px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.start-wrap {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 22px;
    align-items: stretch;
}

.hero-card, .info-card {
    background: rgba(255,255,255,.12);
    border-radius: 24px;
    padding: 24px;
    border: 1px solid rgba(255,255,255,.18);
}

.hero-title {
    font-size: 42px;
    line-height: 1.08;
    margin: 0 0 12px;
    font-weight: 900;
}

.hero-text {
    font-size: 18px;
    line-height: 1.6;
    color: rgba(255,255,255,.92);
    margin: 0 0 22px;
}

.start-btn, .next-btn, .restart-btn {
    border: none;
    cursor: pointer;
    border-radius: 18px;
    padding: 16px 22px;
    font-size: 18px;
    font-weight: 900;
    transition: .18s ease;
}

.start-btn, .restart-btn {
    background: #fff;
    color: #3b1272;
    box-shadow: var(--shadow);
}

    .start-btn:hover, .restart-btn:hover {
        transform: translateY(-2px) scale(1.01);
    }

.mini-list {
    display: grid;
    gap: 12px;
    margin-top: 10px;
}

.mini-item {
    background: rgba(255,255,255,.12);
    border-radius: 16px;
    padding: 14px 16px;
    font-weight: 700;
}

.quiz-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 18px;
}

.question-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
}

.question-title {
    font-size: 26px;
    font-weight: 900;
    margin: 0;
}

.progress {
    height: 12px;
    background: rgba(255,255,255,.16);
    border-radius: 999px;
    overflow: hidden;
    margin-top: 16px;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #ffd43b, #51cf66);
    transition: width .35s ease;
}

.card-stage {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: center;
}

.right-panel {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 20px;
    background: rgba(255,255,255,0.08);
    border-radius: 20px;
    padding: 24px;
    border: 2px solid rgba(255,255,255,0.2);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    backdrop-filter: blur(10px);
}

.flashcard-box {
    background: #fff;
    border-radius: 20px;
    width: 60%;
    aspect-ratio: 3 / 4;
    margin: 0 auto;
    overflow: hidden;
    border: 2px solid rgba(255,255,255,0.6);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15), 0 0 0 6px rgba(255,255,255,0.1);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.flashcard-image {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #fff;
}

.options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 10px;
}

.option {
    border: none;
    border-radius: 20px;
    padding: 18px 16px;
    font-size: 20px;
    font-weight: 900;
    color: #fff;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: .15s ease;
    min-height: 82px;
}

    .option:hover {
        transform: translateY(-2px);
        filter: brightness(1.03);
    }

    .option:disabled {
        cursor: not-allowed;
        opacity: .92;
        transform: none;
    }

    .option.red {
        background: var(--red)
    }

    .option.blue {
        background: var(--blue)
    }

    .option.yellow {
        background: var(--yellow);
        color: #222
    }

    .option.green {
        background: var(--green)
    }

.feedback {
    margin-top: 16px;
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.16);
    border-radius: 18px;
    padding: 16px 18px;
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

    .feedback.show {
        display: flex;
    }

.feedback-text {
    font-size: 18px;
    font-weight: 800;
}

.feedback.correct {
    background: rgba(47,179,68,.18);
    border-color: rgba(47,179,68,.35);
}

.feedback.wrong {
    background: rgba(250,82,82,.18);
    border-color: rgba(250,82,82,.35);
}

.next-btn {
    background: #fff;
    color: #3b1272;
}

.result-box {
    text-align: center;
    padding: 40px 20px;
}

.result-score {
    font-size: 72px;
    font-weight: 900;
    margin: 8px 0 12px;
}

.result-msg {
    font-size: 22px;
    font-weight: 800;
    margin: 0 0 18px;
}

.summary {
    max-width: 780px;
    margin: 20px auto 0;
    display: grid;
    gap: 12px;
    text-align: left;
}

.summary-item {
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.16);
    border-radius: 16px;
    padding: 14px 16px;
    font-weight: 700;
}

.footer-note {
    margin-top: 14px;
    color: rgba(255,255,255,.78);
    text-align: center;
    font-size: 14px;
}


@media (max-width: 768px) {
    .app {
        padding: 10px;
    }

    .topbar {
        gap: 8px;
        margin-bottom: 10px;
    }

    .brand {
        font-size: 18px;
    }

    .meta {
        width: 100%;
        gap: 8px;
    }

    .pill {
        font-size: 12px;
        padding: 6px 10px;
    }

    .panel {
        padding: 12px;
        border-radius: 18px;
    }

    .hero-card,
    .info-card {
        padding: 14px;
        border-radius: 16px;
    }

    .hero-title {
        font-size: 24px;
        line-height: 1.15;
    }

    .hero-text {
        font-size: 14px;
        line-height: 1.45;
    }

    .mini-list {
        gap: 8px;
    }

    .mini-item {
        font-size: 13px;
        padding: 10px 12px;
        border-radius: 12px;
    }

    .quiz-layout {
        gap: 10px;
    }

    .question-head {
        gap: 8px;
    }

    .question-title {
        font-size: 18px;
    }

    .progress {
        height: 8px;
        margin-top: 10px;
    }

    .card-stage {
        grid-template-columns: 1fr;
        gap: 12px;
        align-items: stretch;
    }

    .flashcard-box {
        width: 100%;
        max-width: none;
        min-height: unset;
        aspect-ratio: 3 / 4;
        border-radius: 16px;
    }

    .right-panel {
        gap: 12px;
        padding: 12px;
        border-radius: 16px;
    }

    .options {
        grid-template-columns: 1fr;
        gap: 10px;
        margin-top: 0;
    }

    .option {
        min-height: 58px;
        padding: 12px 14px;
        font-size: 15px;
        border-radius: 14px;
    }

    .feedback {
        padding: 12px;
        gap: 10px;
        border-radius: 14px;
    }

    .feedback-text {
        font-size: 14px;
    }

    .start-btn,
    .next-btn,
    .restart-btn {
        width: 100%;
        font-size: 15px;
        padding: 12px 16px;
        border-radius: 14px;
    }

    .result-box {
        padding: 20px 12px;
    }

    .result-score {
        font-size: 40px;
    }

    .result-msg {
        font-size: 16px;
    }

    .summary {
        gap: 8px;
        margin-top: 12px;
    }

    .summary-item {
        font-size: 13px;
        padding: 10px 12px;
        border-radius: 12px;
    }

    .footer-note {
        font-size: 12px;
    }
}
@media (max-width: 768px) {
    /* Genel */
    body {
        overflow-x: hidden;
    }

    .app {
        padding: 6px;
    }

    /* Üst barı küçült */
    .topbar {
        gap: 6px;
        margin-bottom: 8px;
    }

    .brand {
        width: 100%;
        font-size: 14px;
        line-height: 1.2;
        text-align: center;
    }

    .meta {
        width: 100%;
        display: grid;
        grid-template-columns: 1fr 1fr 1fr;
        gap: 6px;
    }

    .pill {
        text-align: center;
        font-size: 11px;
        padding: 6px 4px;
        border-radius: 12px;
    }

    /* Başlangıç ekranı */
    .start-wrap {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .panel {
        padding: 10px;
        border-radius: 14px;
    }

    .hero-card,
    .info-card {
        padding: 12px;
        border-radius: 14px;
    }

    .hero-title {
        font-size: 20px;
        line-height: 1.15;
    }

    .hero-text {
        font-size: 13px;
        line-height: 1.4;
    }

    .mini-item {
        font-size: 12px;
        padding: 8px 10px;
        border-radius: 10px;
    }

    /* Quiz ekranı */
    .quiz-layout {
        gap: 8px;
    }

    .question-head {
        flex-direction: column;
        align-items: stretch;
        gap: 6px;
    }

    .question-title {
        font-size: 16px;
        text-align: center;
    }

    .progress {
        height: 6px;
        margin-top: 8px;
    }

    .card-stage {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    /* Kartı büyüt ama yüksekliği azalt */
    .flashcard-box {
        width: 100%;
        aspect-ratio: 1 / 1.15;
        border-radius: 14px;
        box-shadow: 0 6px 18px rgba(0,0,0,.12);
    }

    .flashcard-image {
        object-fit: contain;
        padding: 4px;
    }

    /* Sağ paneli kompakt yap */
    .right-panel {
        gap: 8px;
        padding: 10px;
        border-radius: 14px;
    }

    .options {
        grid-template-columns: 1fr;
        gap: 8px;
        margin-top: 0;
    }

    .option {
        min-height: 52px;
        padding: 10px 12px;
        font-size: 14px;
        border-radius: 12px;
    }

    .feedback {
        padding: 10px;
        gap: 8px;
        border-radius: 12px;
        flex-direction: column;
        align-items: stretch;
    }

    .feedback-text {
        font-size: 13px;
        text-align: center;
    }

    .start-btn,
    .next-btn,
    .restart-btn {
        width: 100%;
        font-size: 14px;
        padding: 10px 12px;
        border-radius: 12px;
    }

    /* Sonuç ekranı */
    .result-box {
        padding: 16px 10px;
    }

    .result-score {
        font-size: 34px;
    }

    .result-msg {
        font-size: 14px;
    }

    .summary-item {
        font-size: 12px;
        padding: 8px 10px;
        border-radius: 10px;
    }

    .footer-note {
        font-size: 11px;
    }
}
#quizScreen .panel {
    min-height: calc(100vh - 90px);
}
@media (max-width: 768px) {
    #startScreen .topbar {
        margin-bottom: 6px;
    }
}