:root {
    --card-w: 300px;
    --card-h: 400px;
    --gap: 20px;
    --bg: #0f172a;
    --card-bg: linear-gradient(135deg,#ffffff 0%, #f3f4f6 100%);
    --accent: #0ea5a4;
    --text: #0b1220;
    --radius: 12px;
    --shadow: 0 8px 20px rgba(2,6,23,0.4);
}

/* Basit reset */
* {
    box-sizing: border-box
}

.cardkapsa {
    margin: 0;
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    margin-bottom:60px;
}

.wrap {
    width: 100%;
}

h1 {
    margin: 0 0 18px 0;
    font-size: 20px;
    color: #222;
    text-align: center;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--gap);
    align-items: start;
}

/* Kart buton; erişilebilir olması için button kullandık */
.flip-card {
    width: 100%;
    max-width: var(--card-w);
    height: var(--card-h);
    margin: 0 auto;
    perspective: 1200px; /* 3D perspektif */
    border-radius: var(--radius);
    background: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
    position: relative;
    display: block;
    -webkit-tap-highlight-color: transparent;
    outline: none;
}

/* Görsel düzen: iç katman dönecek */
.flip-card-inner {
    width: 100%;
    height: 100%;
    transition: transform 1200ms cubic-bezier(.2,.9,.3,1);
    transform-style: preserve-3d;
    position: relative;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* flipped state */
.flip-card[aria-pressed="true"] .flip-card-inner,
.flip-card.is-flipped .flip-card-inner {
    transform: rotateY(180deg);
}

/* Front / back yüzleri */
.flip-face {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    backface-visibility: hidden; /* kritik */
    border-radius: var(--radius);
    transform-style: preserve-3d;
}

    .flip-face.front {
        background: var(--card-bg);
        color: var(--text);
        box-shadow: 0 4px 14px rgba(2,6,23,0.18), inset 0 -6px 20px rgba(0,0,0,0.03);
    }

    .flip-face.back {
        background: linear-gradient(90deg, rgba(1, 49, 103, 1) 7%, rgba(9, 78, 154, 1) 82%);
        color: white;
        transform: rotateY(180deg); /* arka yüz ters */
    }

/* İçerik stilleri */
.front .title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
    text-align: center;
}

.front .subtitle {
    font-size: 16px;
    opacity: 0.9;
    text-align: left;
}

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

.back .big {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
}

.back .small {
    font-size: 13px;
    opacity: 0.95;
}

/* küçük ipucu alt köşede */
.hint {
    position: absolute;
    bottom: 8px;
    left: 8px;
    right: 8px;
    font-size: 12px;
    display: flex;
    justify-content: space-between;
    gap: 8px;
    align-items: center;
    pointer-events: none;
}

.chip {
    background: rgba(255,255,255,0.08);
    padding: 6px 8px;
    border-radius: 999px;
    font-size: 12px;
    color: #e6f2f2;
}

/* Focus görünürlüğü - keyboard kullanıcıları için */
.flip-card:focus-visible {
    outline: 3px solid rgba(14,165,164,0.18);
    outline-offset: 6px;
    border-radius: calc(var(--radius) + 6px);
}

/* Hareket azaltma tercih edenler için */
@media (prefers-reduced-motion: reduce) {
    .flip-card-inner {
        transition: none !important;
    }

    .flip-card[aria-pressed="true"] .flip-card-inner {
        transform: none !important;
    }
}

/* Responsive küçültme */
@media (max-width:520px) {
    :root {
        --card-w: 100%;
        --card-h: 400px;
    }

}
.old-select {
    width: 250px;
    display: block;
    overflow: hidden;
    margin: 0 auto;
    margin-bottom: 30px;
    margin-top: 14px;
    border: solid 1px #d9d7d7;
    padding: 10px;
    border-radius: 10px;
}