/* ===== หน้าเด็ก: ล่องแม่น้ำกก =====
   ใช้โลกไม้วัดระดับน้ำจาก home.css ทั้งหมด ไฟล์นี้ปรับแค่: ไม้วัดกลายเป็นลำน้ำ (ไหลจากบนลงล่าง),
   ตัวหนังสือใหญ่ขึ้นสำหรับเด็ก และชิ้นส่วนคำถาม */
.kids { font-size: 19px; line-height: 1.8; --g-rail: 216px; }
.kids .site-footer { font-size: 16px; }

/* ----- ไม้วัด = ลำน้ำ: จุด 1 อยู่บน น้ำไหลลงตามที่อ่าน ----- */
.river-rail .gauge-marks { flex-direction: column; }
.river-rail .gauge-marks li:nth-child(3), .river-rail .gauge-marks li:nth-child(6) { border-top: 0; }
.river-rail .gauge-marks li { border-bottom: 1px solid rgba(20, 24, 31, .14); }
/* ชื่อจุดจอดพิมพ์ไว้ข้างขีดเสมอ ให้ไม้วัดอ่านเป็นแผนที่ลำน้ำ */
.river-rail .mark-label {
    position: static; transform: none; opacity: 1; pointer-events: auto;
    padding: 0 0 0 10px; background: none; color: var(--g-navy); white-space: normal;
    font-size: .95em; line-height: 1.3;
}
.river-rail .gauge-marks a.is-under .mark-label { color: var(--g-paper); }
.river-boat {
    position: absolute; left: 50%; top: calc(var(--level) * 100%); z-index: 5; width: 40px; height: 24px;
    transform: translate(-50%, -78%); transition: top .9s var(--g-ease);
    fill: var(--g-navy); stroke: var(--g-paper); stroke-width: 2; stroke-linejoin: round;
}
.river-rail .gauge-water {
    top: 0; bottom: auto; height: calc(var(--level) * 100%);
    box-shadow: inset 0 -3px 0 var(--g-silt-hi);
}

/* ----- หัวหน้า ----- */
.k-hero { padding-block: clamp(48px, 7vw, 96px); border-bottom: 4px solid var(--g-silt-hi); }
.k-hero h1 { font-size: clamp(2.6rem, 6.4vw, 5.2rem); line-height: 1.3; color: var(--g-navy); margin: 0 0 .3em; }
.k-hero .g-lede { color: var(--g-ink); font-size: clamp(1.15rem, 1.7vw, 1.35rem); }
.k-note { margin: 14px 0 0; font-size: .85em; color: var(--g-ink-2); }
.k-src { margin: 12px 0 0; font-size: .85em; color: var(--g-on-dark-2); }
.k-plates { margin-top: 24px; }
.g-water .k-note, .g-navy .k-note { color: var(--g-on-dark-2); }

/* ----- จุดจอด ----- */
.k-stop { padding-block: clamp(64px, 8vw, 112px); border-bottom: 1px solid rgba(20, 24, 31, .16); }
.k-stop.g-water, .k-stop.g-navy { border-bottom: 0; }
.k-read { max-width: 62ch; }
.k-read p { margin-bottom: .9em; }
.g-water .k-read p, .g-navy .k-read p { color: var(--g-paper); }
.k-big { font-family: var(--g-display); font-weight: 700; font-size: clamp(1.35rem, 2.2vw, 1.7rem); line-height: 1.45; color: var(--g-navy); margin-top: 1.2em; }
.g-water .k-big { color: var(--g-paper); }
.g-navy .k-big { color: var(--g-lime); }

.k-try { max-width: 62ch; margin-top: 32px; padding-top: 16px; border-top: 3px solid var(--g-go); }
.k-try h3 { font-size: 1.3rem; color: var(--g-go); margin-bottom: .3em; }

.k-checks { list-style: none; margin: 24px 0 0; padding: 0; max-width: 62ch; border-top: 3px solid var(--g-ink); }
.k-checks li { border-bottom: 1px solid rgba(20, 24, 31, .2); }
.k-checks label { display: flex; align-items: center; gap: 14px; min-height: 56px; padding: 8px 0; cursor: pointer; font-weight: 500; }
.k-checks input { width: 26px; height: 26px; flex: none; margin: 0; accent-color: var(--g-go); }

.k-answers { list-style: none; margin: 24px 0 0; padding: 0; max-width: 62ch; border-top: 3px solid var(--g-paper); }
.k-answers li { padding: 14px 0; border-bottom: 1px solid rgba(255, 255, 255, .3); color: var(--g-paper); }

/* ----- คำถาม ----- */
.quiz { max-width: 62ch; margin-top: clamp(36px, 5vw, 56px); padding-top: 18px; border-top: 3px solid var(--g-ink); }
.g-water .quiz, .g-navy .quiz { border-top-color: var(--g-paper); }
.quiz-q { font-family: var(--g-display); font-weight: 700; font-size: clamp(1.25rem, 2vw, 1.5rem); line-height: 1.45; margin-bottom: 16px; }
.g-water .quiz-q, .g-navy .quiz-q { color: var(--g-paper); }
.quiz-choices { display: grid; gap: 10px; }
.quiz-choice {
    display: flex; align-items: center; min-height: 58px; width: 100%; padding: 12px 18px;
    text-align: left; font: 600 1.15em/1.4 var(--g-body); color: var(--g-ink);
    background: var(--g-paper); border: 2px solid var(--g-ink); border-radius: 0; cursor: pointer;
    transition: background-color .2s, color .2s, border-color .2s;
}
.quiz-choice:hover:not([aria-disabled="true"]) { border-color: var(--g-navy); background: #eef2f8; }
.quiz-choice.is-right { background: var(--g-go-deep); border-color: var(--g-go-deep); color: #fff; }
.quiz-choice.is-right::after { content: "ถูกต้อง"; margin-left: auto; padding-left: 12px; font-family: var(--g-display); font-size: .92rem; }
.quiz-choice.is-wrong { background: transparent; color: var(--g-ink-2); border-color: var(--g-bad); }
.quiz-choice.is-wrong::after { content: "ยังไม่ใช่"; margin-left: auto; padding-left: 12px; font-family: var(--g-display); font-size: .85em; color: inherit; }
.g-water .quiz-choice.is-wrong, .g-navy .quiz-choice.is-wrong { border-color: var(--g-paper); border-style: dashed; }
.g-water .quiz-choice.is-wrong, .g-navy .quiz-choice.is-wrong { color: var(--g-on-dark-2); }
.quiz-choice[aria-disabled="true"] { cursor: default; }
.quiz-why { min-height: 1.5em; margin: 14px 0 0; font-weight: 500; }
.quiz-why.is-hint { color: var(--g-bad); }
.g-water .quiz-why.is-hint, .g-navy .quiz-why.is-hint { color: #ffd6dc; }
.g-water .quiz-why, .g-navy .quiz-why { color: var(--g-paper); }

/* ----- ปลายทาง ----- */
.k-end { padding-block: clamp(72px, 10vw, 128px); }
.k-end h2 { font-size: clamp(2rem, 4.6vw, 3.6rem); line-height: 1.25; color: var(--g-paper); margin: 0 0 .4em; }
.k-score { font-family: var(--g-display); font-weight: 700; font-size: clamp(1.25rem, 2.2vw, 1.7rem); color: var(--g-paper); }
.k-score b { color: var(--g-lime); }
.k-home { max-width: 62ch; margin-top: 32px; padding-top: 16px; border-top: 3px solid var(--g-paper); color: var(--g-paper); }
.k-home h3 { font-size: 1.35rem; }
.k-home li { margin-bottom: .4em; }

@media (max-width: 900px) {
    .river-rail .gauge-marks { flex-direction: row; }
    .river-rail .gauge-marks li, .river-rail .gauge-marks li:nth-child(n) { border-bottom: 0; border-right: 1px solid rgba(20, 24, 31, .14); }
    .river-rail .gauge-water { bottom: 0; height: auto; box-shadow: inset -3px 0 0 var(--g-silt-hi); }
    .river-boat { top: 6px; left: clamp(16px, calc(var(--level) * 100%), calc(100% - 16px)); width: 30px; height: 18px; transform: translateX(-50%); transition: left .9s var(--g-ease); }
    .river-rail .mark-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); padding: 0; }
    .kids { --g-rail: 0px; }
    .kids { font-size: 18px; }
}
@media (max-width: 640px) {
    .k-hero h1 { font-size: 2.3rem; }
}
@media (prefers-reduced-motion: reduce) { .river-boat { transition: none; } }