@font-face {
    font-family: 'Molengo';
    src: url('fonts/Molengo-Regular.ttf') format('truetype');
    font-weight: 400;
    font-style: normal;
}

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

body { font-family: 'Molengo', sans-serif; font-weight: 400; background: #e8eef5; color: #1a2535; }

.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: #e8eef5; }
.login-container { background: #ffffff; padding: 3rem 2.5rem; border-radius: 24px; width: 100%; max-width: 520px; border: 4px solid #e85d40; box-shadow: 10px 10px 0px #e85d40; }
.login-title { font-family: 'Molengo', sans-serif; font-size: 4.8rem; text-align: center; margin-bottom: 2rem; color: #c03a20; letter-spacing: 0.02em; line-height: 1.2; }
.login-error { background: #fdeee8; color: #8b2500; padding: 1rem 1.2rem; border-radius: 12px; margin-bottom: 1.2rem; font-size: 1.8rem; border: 3px solid #e85d40; }
.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; margin-bottom: 0.5rem; font-size: 2rem; color: #2a4a70; }
.form-group input { width: 100%; padding: 1rem 1.2rem; border: 3px solid #4a7ab0; border-radius: 12px; font-size: 2rem; font-family: 'Molengo', sans-serif; background: #e8eef5; color: #1a2535; transition: border-color 0.2s, box-shadow 0.2s; }
.form-group input:focus { outline: none; border-color: #2a4a70; box-shadow: 0 0 0 4px rgba(42,74,112,0.15); }
.btn-login { width: 100%; padding: 1.1rem; background: #e85d40; color: #fff; border: none; border-radius: 14px; font-size: 2.4rem; font-family: 'Molengo', sans-serif; letter-spacing: 0.05em; cursor: pointer; margin-top: 0.5rem; box-shadow: 0 6px 0 #8b2500; transition: transform 0.1s, box-shadow 0.1s; }
.btn-login:hover  { transform: translateY(-2px); box-shadow: 0 8px 0 #8b2500; }
.btn-login:active { transform: translateY(2px);  box-shadow: 0 3px 0 #8b2500; }

.site-header { display: flex; align-items: center; gap: 1.5rem; padding: 0.8rem 1.8rem; background: #2a4a70; color: #ffffff; flex-wrap: wrap; }
.site-header-user { font-family: 'Molengo', sans-serif; font-size: 2.4rem; color: #ffffff; white-space: nowrap; flex-shrink: 0; }
.mode-tabs { display: flex; gap: 0.6rem; padding: 0; flex: 1; }
.tab-btn { padding: 0.5rem 1.6rem; border: 3px solid rgba(255,255,255,0.4); background: rgba(255,255,255,0.1); border-radius: 50px; cursor: pointer; font-size: 2rem; font-family: 'Molengo', sans-serif; color: rgba(255,255,255,0.7); transition: all 0.2s; white-space: nowrap; }
.tab-btn.active { background: #e85d40; color: #fff; border-color: #e85d40; box-shadow: 0 3px 12px rgba(0,0,0,0.2); }
.tab-btn:not(.active):hover { background: rgba(255,255,255,0.2); color: #fff; }
.star-count { font-family: 'Molengo', sans-serif; font-size: 1.8rem; color: #ffffff; white-space: nowrap; }
.btn-logout { padding: 0.5rem 1.4rem; background: transparent; color: #fff; border: 3px solid rgba(255,255,255,0.7); border-radius: 50px; text-decoration: none; font-size: 1.8rem; font-family: 'Molengo', sans-serif; transition: background 0.2s; white-space: nowrap; flex-shrink: 0; margin-left: auto; }
.btn-logout:hover { background: rgba(255,255,255,0.15); }

.tab-content { display: none; padding: 2rem; background: #e8eef5; }
.tab-content.active { display: block; }
.group-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.5rem; }
.group-card { background: #ffffff; border-radius: 24px; padding: 1.8rem 1.5rem; border: 4px solid #b8cce0; cursor: pointer; transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s; display: flex; flex-direction: column; align-items: center; gap: 1rem; box-shadow: 5px 5px 0 #b8cce0; }
.group-card:hover { transform: translateY(-5px) rotate(-1deg); box-shadow: 8px 10px 0 #e85d40; border-color: #e85d40; }
.group-card.no-level7 { cursor: default; pointer-events: none; }
.group-image-wrap { width: 140px; height: 140px; display: flex; align-items: center; justify-content: center; background: #e8eef5; border-radius: 20px; overflow: hidden; border: 3px solid #b8cce0; }
.group-image-wrap img { width: 100%; height: 100%; object-fit: cover; }
.group-name { font-family: 'Molengo', sans-serif; font-size: 2.4rem; text-align: center; color: #2a4a70; letter-spacing: 0.02em; line-height: 1.2; }
.go-practice-number { font-size: 4.8rem; font-weight: bold; color: #2a4a70; display: flex; align-items: center; justify-content: center; padding-bottom: 20px; }

.srs-bar { display: flex; width: 100%; height: 24px; border-radius: 12px; overflow: hidden; background: #ffffff; border: 3px solid #b8cce0; }
.srs-segment { flex: 1; height: 100%; }
.srs-segment.level-0 { background: #e8eef5; }
.srs-segment.level-1 { background: #ff6666; }
.srs-segment.level-2 { background: #ff9933; }
.srs-segment.level-3 { background: #ffff66; }
.srs-segment.level-4 { background: #66ff66; }
.srs-segment.level-5 { background: #33ccff; }
.srs-segment.level-6 { background: #3366ff; }
.srs-segment.level-7 { background: #9966ff; }
.srs-segment + .srs-segment { border-left: none; }

.session-page { background: #ffffff; min-height: 100vh; display: flex; align-items: center; justify-content: center; }
.session-wrap { display: flex; flex-direction: column; align-items: center; justify-content: center; width: 100%; height: 100vh; padding: 2rem; gap: 4rem; }
.session-word-box { height: 70vh; width: 100%; max-width: 1000px; border: 3px solid #b8cce0; border-radius: 24px; display: flex; align-items: center; justify-content: center; cursor: pointer; background: #ffffff; transition: border-color 0.2s; padding: 30px; }
.session-word { font-family: 'Molengo', sans-serif; font-size: 6rem; font-weight: 400; }
.session-buttons { visibility: hidden; width: 100%; max-width: 1000px; display: flex; justify-content: space-between; gap: 1rem; }
.session-btn { padding: 1.2rem 3rem; border: none; border-radius: 14px; font-size: 2.4rem; font-family: 'Molengo', sans-serif; cursor: pointer; box-shadow: 0 6px 0 rgba(0,0,0,0.2); transition: transform 0.1s, box-shadow 0.1s; }
.session-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 0 rgba(0,0,0,0.2); }
.session-btn:active { transform: translateY(2px); box-shadow: 0 3px 0 rgba(0,0,0,0.2); }
.session-btn-incorrect { background: #e85d40; color: #ffffff; }
.session-btn-correct { background: #6be06b; color: #ffffff; }
.session-btn-correct.auto-next { background: #6be06b; box-shadow: 0 5px 0 #3a9850; pointer-events: none; }

.spelling-input { border: none; border-bottom: 4px solid currentColor; outline: none; background: transparent; font-size: 6rem; font-family: inherit; color: inherit; text-align: center; padding: 0; margin: 0 0.3em; min-width: 1em; }
.spelling-input.oops { color: #e85d40; }