/* ==========================================================================
   KrooTZone (ครูธีร์โซน) — Custom Design System (Bootstrap 5.3 + Light/Dark Mode)
   Primary: #7C3AED | Primary Soft: #F3E8FF | Accent: #FACC15
   Background: #F8FAFC | Text: #1E293B
   ========================================================================== */

:root,
[data-bs-theme="light"] {
    --ktz-primary: #7C3AED;
    --ktz-primary-hover: #6D28D9;
    --ktz-primary-soft: #F3E8FF;
    --ktz-accent: #FACC15;
    --ktz-bg: #F8FAFC;
    --ktz-surface: #FFFFFF;
    --ktz-text: #1E293B;
    --ktz-text-muted: #475569;
    --ktz-border: #E2E8F0;
    --ktz-card-shadow: 0 4px 20px -2px rgba(30, 41, 59, 0.06);
}

[data-bs-theme="dark"] {
    --ktz-primary: #A78BFA;
    --ktz-primary-hover: #C4B5FD;
    --ktz-primary-soft: rgba(124, 58, 237, 0.22);
    --ktz-accent: #FACC15;
    --ktz-bg: #0F172A;
    --ktz-surface: #1E293B;
    --ktz-text: #F8FAFC;
    --ktz-text-muted: #CBD5E1;
    --ktz-border: #334155;
    --ktz-card-shadow: 0 4px 24px -2px rgba(0, 0, 0, 0.35);
}

html, body {
    background-color: var(--ktz-bg);
    color: var(--ktz-text);
    font-family: 'Sarabun', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.65;
    overflow-x: clip;
    max-width: 100%;
}

h1, h2, h3, h4, h5, h6, .navbar-brand, .font-heading {
    font-family: 'Prompt', sans-serif;
    font-weight: 600;
    letter-spacing: -0.01em;
}

/* Sticky Header ที่ไม่บดบังเนื้อหา */
.ktz-navbar {
    background-color: var(--ktz-surface);
    border-bottom: 1px solid var(--ktz-border);
    min-height: 72px;
    z-index: 1030;
}

/* การ์ดขอบมน 16-20px พร้อมเงาบาง */
.ktz-card {
    background-color: var(--ktz-surface);
    border: 1px solid var(--ktz-border);
    border-radius: 18px;
    box-shadow: var(--ktz-card-shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.ktz-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px -4px rgba(124, 58, 237, 0.14);
}

/* รูปปกสัดส่วนสม่ำเสมอ 16:9 ป้องกัน Layout Shift */
.ktz-cover-wrap {
    aspect-ratio: 16 / 9;
    width: 100%;
    overflow: hidden;
    border-top-left-radius: 17px;
    border-top-right-radius: 17px;
    background: linear-gradient(135deg, var(--ktz-primary-soft), rgba(250, 204, 21, 0.18));
    display: flex;
    align-items: center;
    justify-content: center;
}

.ktz-cover-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ปุ่มหลักและปุ่มรอง */
.btn-ktz-primary {
    background-color: #7C3AED;
    border-color: #7C3AED;
    color: #FFFFFF;
    font-family: 'Prompt', sans-serif;
    font-weight: 500;
    border-radius: 12px;
    min-height: 44px;
    padding: 0.55rem 1.25rem;
}

.btn-ktz-primary:hover, .btn-ktz-primary:focus {
    background-color: #6D28D9;
    border-color: #6D28D9;
    color: #FFFFFF;
}

.btn-ktz-accent {
    background-color: var(--ktz-accent);
    border-color: var(--ktz-accent);
    color: #1E293B;
    font-family: 'Prompt', sans-serif;
    font-weight: 600;
    border-radius: 12px;
    min-height: 44px;
}

.badge-ktz-soft {
    background-color: var(--ktz-primary-soft);
    color: var(--ktz-primary);
    font-weight: 600;
    border-radius: 8px;
    padding: 0.35em 0.65em;
}

/* Keyboard Accessibility & Focus Ring */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--ktz-accent) !important;
    outline-offset: 2px !important;
}

/* Touch Target สำหรับมือถือ */
.ktz-touch-target {
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* รองรับผู้ที่ต้องการลดการเคลื่อนไหว (Reduced Motion) */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .ktz-card:hover {
        transform: none;
    }
}

/* ป้องกันการล้นแนวนอนที่ 360px, 768px และ 1440px */
pre, code, table {
    max-width: 100%;
    overflow-x: auto;
}