/* assets/css/style.css */

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Inter", sans-serif;
}

/* Card trắng, viền nhẹ, bóng nhẹ */
.card-glass {
    background: #ffffff;
    border-radius: 0.9rem;
    border: 1px solid #e5e7eb;
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.08);
}

/* Badge nhỏ */
.level-chip {
    display: inline-flex;
    padding: 0.2rem 0.7rem;
    border-radius: 999px;
    font-size: 0.7rem;
    border: 1px solid #d1d5db;
    background: #f9fafb;
    color: #6b7280;
}

/* Flashcard */
.flashcard {
    perspective: 1000px;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    min-height: 180px;
    transform-style: preserve-3d;
    transition: transform 0.6s;
    cursor: pointer;
}

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

.flashcard-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: 0.9rem;
    padding: 1.4rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* Mặt trước */
.flashcard-front {
    background: linear-gradient(135deg, #ffffff, #f3f4f6);
    border: 1px solid #e5e7eb;
}

/* Mặt sau */
.flashcard-back {
    background: linear-gradient(135deg, #e8ffe9, #ffffff);
    border: 1px solid #7AE582;
    transform: rotateY(180deg);
}

/* SweetAlert light */
.swal2-popup {
    background: #ffffff !important;
    color: #111827 !important;
    border-radius: 0.9rem !important;
    border: 1px solid #e5e7eb;
    box-shadow: 0 12px 32px rgba(15, 23, 42, 0.18);
}

.swal2-title {
    color: #111827 !important;
}

.swal2-html-container {
    color: #4b5563 !important;
}

.swal2-confirm {
    background: #7AE582 !important;
    color: #022c22 !important;
    border-radius: 999px !important;
    border: none !important;
}

.swal2-cancel {
    border-radius: 999px !important;
}