/*
Theme Name: CiCC AI LMS Core
Theme URI: https://ungdungai.edu.vn/khoa-hoc-ai/
Description: CiCC AI LMS Core — giao diện child theme chuyên nghiệp cho catalog, khóa học, bài học thử và trải nghiệm học AI.
Author: CiCC
Template: cicc-ungdungai-5.0.1
Version: 0.3.1
Text Domain: cicc-ai-lms-core
*/

/* ================================================================
   Ai LMS Core — Professional Design System Integration
   Uses design-system.css vars for ZERO hard-coded colors
   ================================================================ */

/* ── Custom Props (bridge to design-system.css) ── */
.uai-lms {
    --uai-ink: var(--color-text, #0f172a);
    --uai-muted: var(--color-text-muted, #64748b);
    --uai-brand: var(--color-primary, #4f46e5);
    --uai-accent: var(--color-accent, #0d9488);
    --uai-gold: var(--color-gold, #fbbf24);
    --uai-cta: var(--color-cta, #ea580c);
    --uai-paper: var(--color-bg-light, #fafbfc);
    --uai-surface: var(--color-bg-white, #ffffff);
    --uai-border: var(--color-border, #e2e8f0);
    --uai-shadow-sm: var(--shadow-sm, 0 1px 2px rgba(15,23,42,0.05));
    --uai-shadow-md: var(--shadow-md, 0 4px 12px rgba(15,23,42,0.08));
    --uai-shadow-lg: var(--shadow-lg, 0 12px 32px rgba(15,23,42,0.12));
    --uai-radius: var(--radius-md, 10px);
    --uai-radius-lg: var(--radius-lg, 16px);
    --uai-transition: var(--transition-base, 0.25s ease);
    color: var(--uai-ink);
    font-family: var(--font-body, 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif);
}

.uai-lms, .uai-lms * { box-sizing: border-box; }

/* ── Container ── */
.uai-lms-container {
    width: min(1120px, calc(100% - 40px));
    margin-inline: auto;
}

/* ── Hero ── */
.uai-lms-hero {
    padding: clamp(64px, 9vw, 120px) 0;
    background: linear-gradient(135deg, var(--color-primary-bg, #eef2ff) 0%, #fff 60%, rgba(13,148,136,0.05) 100%);
    position: relative;
    overflow: hidden;
}
.uai-lms-hero::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -20%;
    width: 60%;
    height: 80%;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(13,148,136,0.08) 0%, transparent 70%);
    pointer-events: none;
}
.uai-lms-hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -15%;
    width: 50%;
    height: 60%;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(79,70,229,0.06) 0%, transparent 70%);
    pointer-events: none;
}
.uai-lms-kicker, .uai-course-card__eyebrow {
    margin: 0 0 12px;
    color: var(--uai-brand);
    font-size: .8rem;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    position: relative;
    z-index: 1;
}
.uai-lms h1 {
    max-width: 900px;
    margin: 0;
    font-size: clamp(2.2rem, 5vw, 4.5rem);
    line-height: 1.08;
    letter-spacing: -0.03em;
    font-weight: 800;
    color: var(--uai-ink);
    position: relative;
    z-index: 1;
}
.uai-lms h2 {
    font-size: clamp(1.7rem, 3vw, 2.5rem);
    line-height: 1.15;
    letter-spacing: -0.02em;
    font-weight: 700;
}
.uai-lms-lead {
    max-width: 720px;
    color: var(--uai-muted);
    font-size: clamp(1.05rem, 2vw, 1.3rem);
    line-height: 1.65;
    position: relative;
    z-index: 1;
}

/* ── Taxonomy Chips ── */
.uai-taxonomy-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 12px 0 16px;
    position: relative;
    z-index: 1;
}
.uai-taxonomy-chip {
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(79,70,229,0.15);
    border-radius: 999px;
    padding: 5px 12px;
    color: var(--uai-brand);
    background: rgba(79,70,229,0.06);
    font-size: .82rem;
    font-weight: 600;
    line-height: 1.2;
    transition: all var(--uai-transition);
}
.uai-taxonomy-chip--audience {
    color: #92400e;
    border-color: rgba(234,179,8,0.2);
    background: rgba(234,179,8,0.08);
}

/* ── Audience / Outcomes ── */
.uai-lms-audience { color: var(--uai-muted); line-height: 1.6; }
.uai-lms-outcomes {
    margin: 14px 0 24px;
    padding-left: 22px;
    color: var(--uai-muted);
    line-height: 1.7;
}
.uai-lms-outcomes li::marker { color: var(--uai-brand); }

/* ── Capability Ladder ── */
.uai-capability-ladder { padding-top: 42px; padding-bottom: 20px; }
.uai-capability-ladder__grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; }
.uai-capability-step {
    min-height: 72px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 14px;
    border: 1px solid rgba(79,70,229,0.12);
    border-radius: 12px;
    background: rgba(79,70,229,0.04);
    color: var(--uai-brand);
    font-weight: 700;
    text-align: center;
    transition: all var(--uai-transition);
}
.uai-capability-step:hover {
    transform: translateY(-2px);
    box-shadow: var(--uai-shadow-md);
    border-color: rgba(79,70,229,0.2);
}
.uai-capability-step--parallel {
    border-color: rgba(234,179,8,0.2);
    background: rgba(234,179,8,0.06);
    color: #92400e;
}
.uai-capability-step small { margin-top: 5px; font-size: .75rem; font-weight: 500; color: inherit; }
.uai-capability-ladder + .uai-lms-section { padding-top: 32px; }
@media (max-width: 760px) { .uai-capability-ladder__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* ================================================================
   CiCC AI LMS identity layer
   One visual language for the child theme: deep teal, living green,
   lime signal and warm paper. Scoped to AI LMS surfaces only.
   ================================================================ */
:root {
    --cicc-ai-ink: #102f38;
    --cicc-ai-deep: #0b3034;
    --cicc-ai-teal: #1b6b5d;
    --cicc-ai-green: #2f8a68;
    --cicc-ai-lime: #c7f36b;
    --cicc-ai-gold: #e9b949;
    --cicc-ai-paper: #f5f8f3;
    --cicc-ai-line: #dbe7de;
    --cicc-ai-shadow: 0 18px 50px rgba(16, 47, 56, .10);
}

.uai-lms,
.cc-page,
.wb-experience {
    --uai-ink: var(--cicc-ai-ink);
    --uai-brand: var(--cicc-ai-teal);
    --uai-accent: var(--cicc-ai-green);
    --uai-gold: var(--cicc-ai-lime);
    --uai-cta: var(--cicc-ai-green);
    --uai-paper: var(--cicc-ai-paper);
    --uai-border: var(--cicc-ai-line);
}

body.single-ungdung_ai_khoa_hoc,
body.single-ungdung_ai_bai_hoc,
body.uai-lms-catalog {
    --uai-ink: var(--cicc-ai-ink);
    --uai-muted: #64748b;
    --uai-brand: var(--cicc-ai-teal);
    --uai-accent: var(--cicc-ai-green);
    --uai-gold: var(--cicc-ai-lime);
    --uai-cta: var(--cicc-ai-green);
    --uai-cta-hover: var(--cicc-ai-deep);
    --uai-paper: var(--cicc-ai-paper);
    --uai-surface: #ffffff;
    --uai-border: var(--cicc-ai-line);
    --uai-shadow-sm: 0 1px 3px rgba(16,47,56,.08);
    --uai-shadow-lg: 0 12px 32px rgba(16,47,56,.12);
    --uai-radius: 10px;
    --uai-radius-lg: 16px;
    --uai-transition: 0.25s ease;
    overflow-x: hidden;
}
body.single-ungdung_ai_khoa_hoc .container,
body.single-ungdung_ai_bai_hoc .container {
    box-sizing: border-box;
    max-width: 100%;
    width: min(1280px, calc(100% - 40px));
}
.wb-experience,
.wb-experience .container,
.wb-experience .course-next-path,
.wb-experience .course-next-path__actions { min-width: 0; max-width: 100%; }
.wb-experience .container { box-sizing: border-box; width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.wb-experience .course-next-path__eyebrow,
.wb-experience .course-next-path h2,
.wb-experience .course-next-path p { max-width: 100%; overflow-wrap: anywhere; }
.wb-experience .course-next-path__actions { display: flex; flex-wrap: wrap; }
.wb-art-tabs { max-width: 100%; overflow-x: auto; overscroll-behavior-inline: contain; }
.wb-experience table { display: block; max-width: 100%; overflow-x: auto; }
.wb-experience img,
.wb-experience iframe,
.wb-experience video { max-width: 100%; }

.uai-lms h1,
.uai-lms h2,
.uai-lms h3,
.cc-page h1,
.cc-page h2,
.cc-page h3,
.wb-experience h1,
.wb-experience h2,
.wb-experience h3 {
    font-family: var(--font-heading, 'Plus Jakarta Sans', Inter, sans-serif);
    color: var(--cicc-ai-ink);
}

.uai-lms-hero {
    background:
        radial-gradient(circle at 84% 18%, rgba(199, 243, 107, .24), transparent 28%),
        linear-gradient(135deg, #eaf3e9 0%, #f8fbf7 58%, #e2f0e9 100%);
}

.uai-lms-hero::before { background: radial-gradient(circle, rgba(47, 138, 104, .14) 0%, transparent 70%); }
.uai-lms-hero::after { background: radial-gradient(circle, rgba(199, 243, 107, .16) 0%, transparent 70%); }

.uai-button,
.cc-btn--primary,
.btn--primary {
    background: var(--cicc-ai-teal);
    border-color: var(--cicc-ai-teal);
    box-shadow: 0 8px 22px rgba(27, 107, 93, .20);
}
.uai-button:hover,
.cc-btn--primary:hover,
.btn--primary:hover {
    background: var(--cicc-ai-deep);
    border-color: var(--cicc-ai-deep);
    box-shadow: 0 12px 28px rgba(11, 48, 52, .24);
}
.uai-button--secondary,
.cc-btn--secondary,
.btn--outline {
    color: var(--cicc-ai-teal);
    border-color: rgba(27, 107, 93, .28);
    background: rgba(255, 255, 255, .72);
}
.uai-button--secondary:hover,
.cc-btn--secondary:hover,
.btn--outline:hover { color: var(--cicc-ai-deep); background: #eaf3e9; }

.uai-course-card,
.uai-module,
.uai-fact-card,
.uai-lms-fact-card {
    border-color: var(--cicc-ai-line);
    box-shadow: 0 8px 24px rgba(16, 47, 56, .045);
}
.uai-course-card:hover,
.uai-module:hover { border-color: rgba(47, 138, 104, .40); box-shadow: var(--cicc-ai-shadow); }
.uai-course-card__eyebrow,
.uai-lms-kicker { color: var(--cicc-ai-teal); }
.uai-taxonomy-chip { color: var(--cicc-ai-teal); border-color: rgba(27, 107, 93, .22); background: rgba(27, 107, 93, .07); }

.cc-page.uai-lms-catalog {
    background: var(--cicc-ai-paper);
    color: var(--cicc-ai-ink);
}
.cc-page.uai-lms-catalog .cc-hero {
    background:
        radial-gradient(circle at 83% 22%, rgba(199, 243, 107, .22), transparent 25%),
        linear-gradient(135deg, #0b3034 0%, #124c4b 56%, #1b6b5d 100%);
}
.cc-page.uai-lms-catalog .cc-hero__title,
.cc-page.uai-lms-catalog .cc-hero__subtitle,
.cc-page.uai-lms-catalog .cc-hero__eyebrow { color: #f5fbf4; }
.cc-page.uai-lms-catalog .cc-hero__highlight { color: var(--cicc-ai-lime); }
.cc-page.uai-lms-catalog .cc-label { color: var(--cicc-ai-teal); }
.cc-page.uai-lms-catalog .cc-step,
.cc-page.uai-lms-catalog .cc-belt-card,
.cc-page.uai-lms-catalog .cc-studio-card,
.cc-page.uai-lms-catalog .cc-faq-item { border-color: var(--cicc-ai-line); box-shadow: 0 8px 22px rgba(16, 47, 56, .05); }
.cc-page.uai-lms-catalog .cc-step:hover,
.cc-page.uai-lms-catalog .cc-belt-card:hover,
.cc-page.uai-lms-catalog .cc-studio-card:hover { border-color: rgba(47, 138, 104, .42); transform: translateY(-3px); }
.cc-page.uai-lms-catalog .cc-bottom-cta { background: linear-gradient(135deg, var(--cicc-ai-deep), var(--cicc-ai-teal)); }

.wb-experience { background: #f5f8f3; }
.wb-experience .ai-wb-learner-hero { background: radial-gradient(circle at 82% 18%, rgba(199,243,107,.18), transparent 30%), linear-gradient(135deg, #0b3034, #124c4b 62%, #1b6b5d); }
.wb-experience .ai-wb-learner-hero h1,
.wb-experience .ai-wb-learner-hero h2 { color: #fff; }
.wb-experience .ai-wb-learner-hero h1 span,
.wb-experience .ai-wb-eyebrow { color: var(--cicc-ai-lime); }
.wb-experience .ai-wb-stage.is-current { box-shadow: inset 0 3px var(--cicc-ai-green), 0 10px 24px rgba(16,47,56,.08); }

@media (max-width: 760px) {
    .uai-lms-container { width: min(100% - 28px, 1120px); }
    .uai-lms-actions { align-items: stretch; }
    .uai-lms-actions .uai-button { justify-content: center; width: 100%; }
    .cc-page.uai-lms-catalog .cc-hero { padding-top: 58px; padding-bottom: 58px; }
    .wb-experience .container { width: calc(100% - 28px); }
    body.single-ungdung_ai_khoa_hoc .container,
    body.single-ungdung_ai_bai_hoc .container { width: calc(100% - 28px); }
}

/* ── Sections ── */
.uai-lms-section { padding: clamp(42px, 7vw, 84px) 0; }

/* ── Actions / Buttons ── */
.uai-lms-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; margin-top: 28px; position: relative; z-index: 1; }
.uai-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border-radius: var(--uai-radius);
    padding: 14px 28px;
    background: var(--uai-brand);
    color: #fff;
    font-weight: 700;
    font-size: 15px;
    text-decoration: none;
    transition: all var(--uai-transition);
    box-shadow: 0 4px 16px rgba(79,70,229,0.2);
}
.uai-button:hover {
    background: var(--color-primary-dark, #3730a3);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(79,70,229,0.3);
}
.uai-button:focus-visible {
    outline: 3px solid var(--uai-gold);
    outline-offset: 3px;
}
.uai-button[disabled] { cursor: not-allowed; opacity: .58; }
.uai-button--secondary {
    background: rgba(79,70,229,0.08);
    color: var(--uai-brand);
    border: 1px solid rgba(79,70,229,0.15);
    box-shadow: none;
}
.uai-button--secondary:hover {
    background: rgba(79,70,229,0.12);
    transform: translateY(-1px);
}
.uai-lms-note { color: var(--uai-muted); font-size: .95rem; }

/* ── Two Column Layout ── */
.uai-lms-two-col {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 42px;
    align-items: start;
}
.uai-lms-fact-card {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 4px 14px;
    padding: 24px;
    border-radius: var(--uai-radius-lg);
    background: rgba(79,70,229,0.04);
    border: 1px solid rgba(79,70,229,0.08);
}
.uai-lms-fact-card strong {
    font-size: 1.8rem;
    color: var(--uai-brand);
    letter-spacing: -0.02em;
}
.uai-lms-fact-card span { align-self: center; color: var(--uai-muted); }

/* ── Curriculum ── */
.uai-curriculum { display: grid; gap: 12px; }
.uai-module {
    border: 1px solid var(--uai-border);
    border-radius: var(--uai-radius);
    background: var(--uai-surface);
    transition: all var(--uai-transition);
    overflow: hidden;
}
.uai-module:hover {
    border-color: rgba(79,70,229,0.15);
    box-shadow: var(--uai-shadow-sm);
}
.uai-module summary {
    display: flex;
    gap: 14px;
    align-items: center;
    cursor: pointer;
    padding: 18px 20px;
    font-weight: 700;
    list-style: none;
    transition: background var(--uai-transition);
}
.uai-module summary::-webkit-details-marker { display: none; }
.uai-module summary span { color: var(--uai-brand); font-weight: 800; }
.uai-module summary:hover { background: rgba(79,70,229,0.03); }
.uai-module[open] { border-color: rgba(79,70,229,0.15); }
.uai-lesson {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 16px 20px 20px 58px;
    border-top: 1px solid var(--color-border-light, #f1f5f9);
    transition: background var(--uai-transition);
}
.uai-lesson:hover { background: rgba(79,70,229,0.02); }
.uai-lesson p { margin: 6px 0 0; }
.uai-lesson__tag { color: var(--uai-brand); font-size: .85rem; white-space: nowrap; }

/* ── Trial Callout ── */
.uai-trial-callout {
    margin-bottom: 60px;
    padding: 36px;
    border-radius: var(--uai-radius-lg);
    background: linear-gradient(135deg, var(--color-bg-dark, #0f172a) 0%, #1e3a8a 100%);
    color: #fff;
    position: relative;
    overflow: hidden;
}
.uai-trial-callout::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 60%;
    height: 100%;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(13,148,136,0.15) 0%, transparent 70%);
    pointer-events: none;
}
.uai-trial-callout p { max-width: 700px; color: #d8e5f0; line-height: 1.6; position: relative; z-index: 1; }
.uai-trial-callout .uai-button {
    background: var(--uai-cta);
    box-shadow: 0 4px 16px rgba(234,88,12,0.3);
    position: relative;
    z-index: 1;
}
.uai-trial-callout .uai-button:hover {
    background: var(--color-cta-hover, #c2410c);
    box-shadow: 0 8px 24px rgba(234,88,12,0.4);
}

/* ── Course Cards ── */
.uai-course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}
.uai-course-card, .uai-fact-card, .uai-empty-state {
    border: 1px solid var(--uai-border);
    border-radius: var(--uai-radius-lg);
    padding: 28px;
    background: var(--uai-surface);
    box-shadow: var(--uai-shadow-sm);
    transition: all var(--uai-transition);
}
.uai-course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--uai-shadow-lg);
    border-color: rgba(79,70,229,0.15);
}
.uai-course-card h3 { margin: 0 0 12px; font-size: 1.35rem; font-weight: 700; }
.uai-course-card h3 a { color: inherit; text-decoration: none; transition: color var(--uai-transition); }
.uai-course-card h3 a:hover { color: var(--uai-brand); }
.uai-course-card p, .uai-lesson p { color: var(--uai-muted); line-height: 1.6; }

/* ── Catalog Filters ── */
.uai-catalog-filters {
    margin: 24px 0 32px;
    padding: 20px;
    border: 1px solid var(--uai-border);
    border-radius: var(--uai-radius);
    background: rgba(79,70,229,0.03);
}
.uai-catalog-filters__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 14px;
    margin-bottom: 18px;
}
.uai-catalog-filters label span { display: block; margin-bottom: 6px; font-weight: 700; font-size: .9rem; }
.uai-catalog-filters select {
    width: 100%;
    min-height: 42px;
    padding: 8px;
    border: 1px solid var(--uai-border);
    border-radius: var(--uai-radius);
    background: #fff;
    transition: border-color var(--uai-transition);
}
.uai-catalog-filters select:focus { border-color: var(--uai-brand); outline: none; }

/* ── Artifacts ── */
.uai-artifact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 28px;
}
.uai-artifact-card {
    min-height: 170px;
    border: 1px solid var(--uai-border);
    border-radius: var(--uai-radius);
    padding: 20px;
    background: var(--uai-surface);
    transition: all var(--uai-transition);
}
.uai-artifact-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--uai-shadow-md);
}
.uai-artifact-card h3 { margin: 20px 0 8px; }
.uai-artifact-card p { color: var(--uai-muted); line-height: 1.55; }
.uai-artifact-card__status {
    display: inline-block;
    border-radius: 999px;
    padding: 5px 9px;
    font-size: .76rem;
    font-weight: 700;
}
.uai-artifact-card.is-available .uai-artifact-card__status { color: #12613d; background: #e7f6ed; }
.uai-artifact-card.is-pending .uai-artifact-card__status { color: #875b00; background: #fff4d6; }

/* ── Video Frame ── */
.uai-video-frame {
    position: relative;
    aspect-ratio: 16/9;
    margin: 16px 0;
    overflow: hidden;
    border-radius: var(--uai-radius);
    background: var(--color-bg-dark, #0f172a);
    box-shadow: var(--uai-shadow-md);
}
.uai-video-frame iframe { width: 100%; height: 100%; border: 0; }
.uai-artifact-card audio { width: 100%; margin: 16px 0; }

/* ── Pending Materials ── */
.uai-pending-materials {
    margin-top: 22px;
    padding: 18px 20px;
    border-left: 4px solid var(--color-warning, #eab308);
    border-radius: 8px;
    background: rgba(234,179,8,0.06);
    color: #92400e;
}
.uai-pending-materials ul { margin: 10px 0 0; padding-left: 20px; line-height: 1.7; }

/* ── Quiz ── */
.uai-quiz-box {
    margin-top: 36px;
    padding: 26px;
    border: 1px solid var(--uai-border);
    border-radius: var(--uai-radius-lg);
    background: var(--uai-surface);
}
.uai-quiz-box h2 { margin-top: 0; }
.uai-quiz-question {
    margin: 22px 0;
    padding: 18px;
    border: 1px solid var(--color-border-light, #f1f5f9);
    border-radius: var(--uai-radius);
    transition: border-color var(--uai-transition);
}
.uai-quiz-question:hover { border-color: rgba(79,70,229,0.15); }
.uai-quiz-question legend { padding: 0 6px; font-weight: 700; line-height: 1.5; }
.uai-quiz-option { display: block; margin: 12px 0; color: var(--uai-muted); line-height: 1.5; }
.uai-quiz-option input { margin-right: 8px; accent-color: var(--uai-brand); }
.uai-quiz-status { color: var(--uai-muted); }

/* ── Certificate ── */
.uai-certificate-actions {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--color-border-light, #f1f5f9);
}
.uai-certificate-actions[hidden] { display: none; }
.uai-certificate-actions .uai-button { margin: 8px 8px 0 0; }

/* ── Activity Box ── */
.uai-activity-box {
    margin-top: 36px;
    padding: 26px;
    border: 1px solid var(--uai-border);
    border-radius: var(--uai-radius-lg);
    background: rgba(79,70,229,0.03);
}
.uai-activity-box h2 { margin-top: 0; font-size: 1.5rem; }
.uai-trial-status { color: var(--uai-muted); font-size: .95rem; }

/* ── Focus Visible ── */
.uai-button:focus-visible,
.uai-lms a:focus-visible,
.uai-lms input:focus-visible,
.uai-lms summary:focus-visible {
    outline: 3px solid var(--uai-gold);
    outline-offset: 3px;
}

/* ================================================================
   Responsive — Mobile First
   ================================================================ */
@media (max-width: 700px) {
    .uai-lms-container { width: min(100% - 28px, 1120px); }
    .uai-lms-hero { padding: clamp(48px, 8vw, 80px) 0 clamp(32px, 5vw, 48px); }
    .uai-lms h1 { font-size: clamp(1.8rem, 6vw, 2.5rem); }
    .uai-lms-two-col { grid-template-columns: 1fr; gap: 24px; }
    .uai-lesson { padding-left: 20px; flex-direction: column; gap: 8px; }
    .uai-lms-actions { align-items: flex-start; flex-direction: column; }
    .uai-lms-actions .uai-button { width: 100%; text-align: center; justify-content: center; }
    .uai-course-grid { grid-template-columns: 1fr; }
    .uai-artifact-grid { grid-template-columns: 1fr; }
    .uai-trial-callout { padding: 24px; margin-bottom: 40px; }

    /* Header/footer overrides */
    body.single-ungdung_ai_khoa_hoc .top-bar-inner,
    body.single-ungdung_ai_bai_hoc .top-bar-inner {
        grid-template-columns: 1fr;
        gap: .5rem;
        min-width: 0;
        width: 100% !important;
        max-width: none !important;
        box-sizing: border-box !important;
        padding: .5rem 0 !important;
    }
    body.single-ungdung_ai_khoa_hoc .top-bar-left,
    body.single-ungdung_ai_khoa_hoc .top-bar-right,
    body.single-ungdung_ai_bai_hoc .top-bar-left,
    body.single-ungdung_ai_bai_hoc .top-bar-right {
        justify-content: center;
        flex-wrap: wrap;
        min-width: 0;
    }
    body.single-ungdung_ai_khoa_hoc .top-bar-center,
    body.single-ungdung_ai_bai_hoc .top-bar-center { width: 100%; min-width: 0; }
    body.single-ungdung_ai_khoa_hoc .top-search-form,
    body.single-ungdung_ai_bai_hoc .top-search-form { max-width: none; }
    body.single-ungdung_ai_khoa_hoc .header-inner,
    body.single-ungdung_ai_bai_hoc .header-inner {
        width: 100%;
        max-width: none;
        min-width: 0;
        box-sizing: border-box !important;
    }
    body.single-ungdung_ai_khoa_hoc .header-actions,
    body.single-ungdung_ai_bai_hoc .header-actions { min-width: 0; }
    body.single-ungdung_ai_khoa_hoc .site-footer .container,
    body.single-ungdung_ai_bai_hoc .site-footer .container { width: 100%; box-sizing: border-box; }
    body.single-ungdung_ai_khoa_hoc .footer-grid,
    body.single-ungdung_ai_bai_hoc .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

@media (min-width: 701px) and (max-width: 960px) {
    .uai-capability-ladder__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ── Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
    .uai-lms *, .uai-lms *::before, .uai-lms *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}

/* ================================================================
   AI LMS Catalog — conversion and editorial layer
   Scoped to the child-theme catalog so legacy pages remain untouched.
   ================================================================ */
.uai-lms-catalog .uai-proof-strip {
    position: relative;
    z-index: 2;
    margin: -26px auto 0;
    width: min(1120px, calc(100% - 32px));
    border: 1px solid rgba(13, 148, 136, .2);
    border-radius: 22px;
    background: rgba(255, 255, 255, .96);
    box-shadow: 0 18px 50px rgba(15, 23, 42, .12);
}
.uai-proof-strip__grid { display: grid; grid-template-columns: repeat(4, 1fr); padding: 22px 28px; }
.uai-proof-item { display: flex; align-items: center; gap: 13px; padding: 0 22px; border-right: 1px solid #e5e7eb; color: #243447; font-size: .91rem; line-height: 1.25; }
.uai-proof-item:first-child { padding-left: 0; }
.uai-proof-item:last-child { border-right: 0; padding-right: 0; }
.uai-proof-item strong { color: #0f766e; font-size: 1.65rem; letter-spacing: -.06em; white-space: nowrap; }
.uai-proof-item small { color: #64748b; font-size: .76rem; }
.uai-method-section { padding: 92px 0 84px; background: linear-gradient(180deg, #f7fbfa 0%, #fff 100%); }
.uai-section-heading { max-width: 720px; margin-bottom: 38px; }
.uai-method-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.uai-method-card { position: relative; min-height: 245px; padding: 28px; overflow: hidden; border: 1px solid #dbe8e5; border-radius: 22px; background: #fff; box-shadow: 0 10px 28px rgba(15, 118, 110, .06); transition: transform .25s ease, box-shadow .25s ease; }
.uai-method-card:hover { transform: translateY(-5px); box-shadow: 0 18px 40px rgba(15, 118, 110, .14); }
.uai-method-card--active { color: #fff; border-color: #0f766e; background: linear-gradient(145deg, #0b3b3c, #0f766e); box-shadow: 0 20px 42px rgba(15, 118, 110, .22); }
.uai-method-card__number { display: block; color: #14b8a6; font-weight: 800; font-size: .75rem; letter-spacing: .15em; }
.uai-method-card__icon { display: inline-grid; place-items: center; width: 48px; height: 48px; margin: 22px 0 17px; border-radius: 15px; color: #0f766e; background: #e6fffa; font-size: 1.55rem; font-weight: 800; }
.uai-method-card--active .uai-method-card__icon { color: #0b3b3c; background: #b7f7d2; }
.uai-method-card h3 { margin: 0 0 10px; color: #102a31; font-size: 1.15rem; }
.uai-method-card--active h3 { color: #fff; }
.uai-method-card p { margin: 0; color: #5f7180; line-height: 1.65; }
.uai-method-card--active p { color: #d8f5ef; }
.uai-editorial-section { padding: 84px 0; background: #fff; }
.uai-editorial-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(32px, 8vw, 100px); align-items: start; }
.uai-editorial-copy { color: #4b5f6b; font-size: 1.02rem; line-height: 1.8; }
.uai-editorial-copy p { margin: 0 0 18px; }
.uai-editorial-copy strong { color: #143943; }
.uai-text-link { display: inline-flex; align-items: center; gap: 8px; margin-top: 6px; color: #0f766e; font-weight: 800; text-decoration: none; }
.uai-text-link:hover { color: #115e59; text-decoration: underline; }
@media (max-width: 820px) {
    .uai-proof-strip__grid { grid-template-columns: repeat(2, 1fr); gap: 18px 0; }
    .uai-proof-item:nth-child(2) { border-right: 0; }
    .uai-proof-item:nth-child(3), .uai-proof-item:nth-child(4) { padding-top: 18px; border-top: 1px solid #e5e7eb; }
    .uai-method-grid, .uai-editorial-grid { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
    .uai-lms-catalog .uai-proof-strip { width: calc(100% - 22px); margin-top: -16px; border-radius: 16px; }
    .uai-proof-strip__grid { padding: 18px 16px; }
    .uai-proof-item { gap: 9px; padding-left: 10px; padding-right: 10px; font-size: .78rem; }
    .uai-proof-item:first-child { padding-left: 0; }
    .uai-proof-item strong { font-size: 1.25rem; }
    .uai-method-section, .uai-editorial-section { padding: 58px 0; }
}

/* Homepage intro video: exact 2/3 video + 1/3 copy. */
.homepage-intro-video,
.discovery {
    background-color: #f8fbff;
    background-image:
        linear-gradient(180deg, rgba(255,255,255,.90), rgba(248,251,255,.94)),
        url('assets/img/ai-tech-section-bg.webp');
    background-position: center, center;
    background-repeat: no-repeat;
    background-size: cover;
}
.homepage-intro-video__wrapper {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    gap: 3rem;
    align-items: center;
}
.homepage-intro-video__video,
.homepage-intro-video__copy {
    width: 100%;
    min-width: 0;
    max-width: none;
}
.homepage-intro-video__video iframe {
    display: block;
    width: 100%;
    max-width: none;
    aspect-ratio: 16 / 9;
    min-height: 0;
    border: 0;
}

/* Homepage course spotlight, adapted from the public AI Academy course page. */
.homepage-course-spotlight {
    position: relative;
    overflow: hidden;
    color: #fff;
    background:
        radial-gradient(620px 280px at 92% 10%, rgba(199,243,107,.13), transparent 65%),
        linear-gradient(135deg, #0b3034 0%, #123f4b 56%, #1b6b5d 100%);
}
.homepage-course-spotlight::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: linear-gradient(rgba(255,255,255,.055) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.055) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: linear-gradient(120deg, transparent 0%, #000 35%, #000 80%, transparent 100%);
    pointer-events: none;
}
.homepage-course-spotlight__inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr);
    gap: clamp(32px, 7vw, 84px);
    align-items: center;
    width: min(1200px, calc(100% - 48px));
    margin-inline: auto;
    padding: clamp(56px, 7vw, 88px) 0;
}
.homepage-course-spotlight__tag { display: inline-flex; padding: 7px 12px; border: 1px solid rgba(199,243,107,.45); border-radius: 999px; color: #c7f36b; font-size: .75rem; font-weight: 800; letter-spacing: .1em; }
.homepage-course-spotlight h2 { max-width: 680px; margin: 16px 0 18px; color: #fff; font-size: clamp(2rem, 4vw, 3.25rem); line-height: 1.08; letter-spacing: -.04em; }
.homepage-course-spotlight h2 span { color: #c7f36b; }
.homepage-course-spotlight__copy > p { max-width: 650px; margin: 0; color: rgba(255,255,255,.78); font-size: 1.05rem; line-height: 1.7; }
.homepage-course-spotlight__stats { display: flex; flex-wrap: wrap; gap: 24px; margin: 26px 0 30px; color: rgba(255,255,255,.68); font-size: .82rem; }
.homepage-course-spotlight__stats strong { display: block; margin-bottom: 4px; color: #c7f36b; font-size: 1.15rem; }
.homepage-course-spotlight__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.homepage-course-spotlight__button { display: inline-flex; padding: 12px 18px; border-radius: 10px; color: #0b3034; background: #c7f36b; font-weight: 800; text-decoration: none; }
.homepage-course-spotlight__button:hover { color: #0b3034; background: #d9ff91; transform: translateY(-2px); }
.homepage-course-spotlight__link { color: #fff; font-weight: 700; text-decoration: none; }
.homepage-course-spotlight__link:hover { color: #c7f36b; }
.homepage-course-spotlight__steps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.homepage-course-spotlight__steps > div { display: flex; align-items: center; gap: 14px; min-height: 112px; padding: 20px; border: 1px solid rgba(255,255,255,.16); border-radius: 18px; background: rgba(255,255,255,.08); box-shadow: 0 18px 45px rgba(0,0,0,.12); }
.homepage-course-spotlight__steps b { color: #c7f36b; font-size: 1.35rem; }
.homepage-course-spotlight__steps span { color: #fff; font-weight: 700; line-height: 1.35; }
.homepage-belt-journey {
    position: relative;
    overflow: hidden;
    background: linear-gradient(180deg, #f5f8f3 0%, #fff 100%);
}
.homepage-belt-journey__inner { width: min(1200px, calc(100% - 48px)); margin-inline: auto; padding: clamp(56px, 7vw, 82px) 0; }
.homepage-belt-journey__header { max-width: 680px; margin: 0 auto 42px; text-align: center; }
.homepage-belt-journey__tag { color: #1b6b5d; font-size: .75rem; font-weight: 800; letter-spacing: .12em; }
.homepage-belt-journey h2 { margin: 12px 0 14px; color: #102f38; font-size: clamp(2rem, 4vw, 3rem); line-height: 1.1; letter-spacing: -.04em; }
.homepage-belt-journey h2 span { color: #1b6b5d; }
.homepage-belt-journey__header p { margin: 0; color: #5f7180; line-height: 1.7; }
.homepage-belt-journey__track { position: relative; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.homepage-belt-journey__track::before { content: ''; position: absolute; top: 28px; left: 8%; right: 8%; height: 2px; background: linear-gradient(90deg, #c7f36b, #1b6b5d); opacity: .55; }
.homepage-belt-journey__track article { position: relative; z-index: 1; display: flex; min-height: 150px; flex-direction: column; align-items: center; padding: 0; border: 1px solid #dbe7de; border-radius: 18px; background: rgba(255,255,255,.92); box-shadow: 0 10px 24px rgba(16,47,56,.06); text-align: center; animation: homepageBeltIn .65s both; }
.homepage-belt-journey__track article:nth-child(2) { animation-delay: .08s; }
.homepage-belt-journey__track article:nth-child(3) { animation-delay: .16s; }
.homepage-belt-journey__track article:nth-child(4) { animation-delay: .24s; }
.homepage-belt-journey__track article:nth-child(5) { animation-delay: .32s; }
.homepage-belt-journey__track article:hover { transform: translateY(-7px); border-color: #1b6b5d; box-shadow: 0 18px 34px rgba(16,47,56,.14); }
.homepage-belt-journey__track article > a { display: flex; width: 100%; min-height: 150px; flex-direction: column; align-items: center; padding: 18px 12px; color: inherit; text-decoration: none; }
.homepage-belt-journey__track article > a:focus-visible { outline: 3px solid #c7f36b; outline-offset: -4px; border-radius: 17px; }
.homepage-belt-journey__track b { display: grid; place-items: center; width: 38px; height: 38px; margin-bottom: 15px; border: 4px solid #fff; border-radius: 50%; color: #0b3034; background: #c7f36b; box-shadow: 0 0 0 4px rgba(27,107,93,.15); font-size: .75rem; }
.homepage-belt-journey__track article:nth-child(2) b { background: #67d7bc; }
.homepage-belt-journey__track article:nth-child(3) b { background: #63b3ed; }
.homepage-belt-journey__track article:nth-child(4) b { color: #fff; background: #355c7d; }
.homepage-belt-journey__track article:nth-child(5) b { color: #fff; background: #7c5cff; }
.homepage-belt-journey__track strong { color: #102f38; font-size: .95rem; }
.homepage-belt-journey__track span { margin-top: 8px; color: #6b7e87; font-size: .75rem; line-height: 1.4; }
.homepage-belt-journey__footer { margin-top: 28px; text-align: center; }
.homepage-belt-journey__footer a { color: #1b6b5d; font-weight: 800; text-decoration: none; }
.homepage-belt-journey__footer a:hover { color: #0b3034; text-decoration: underline; }
@keyframes homepageBeltIn { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
@media (prefers-reduced-motion: reduce) { .homepage-belt-journey__track article { animation: none; } }
@media (max-width: 768px) {
    .homepage-intro-video__wrapper { grid-template-columns: 1fr; gap: 1.5rem; }
    .homepage-course-spotlight__inner { grid-template-columns: 1fr; gap: 32px; width: min(100% - 32px, 720px); }
    .homepage-course-spotlight__steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .homepage-belt-journey__inner { width: min(100% - 32px, 720px); }
    .homepage-belt-journey__track { grid-template-columns: 1fr; gap: 12px; }
    .homepage-belt-journey__track::before { top: 8%; bottom: 8%; left: 29px; width: 2px; height: auto; right: auto; }
    .homepage-belt-journey__track article { min-height: 0; flex-direction: row; align-items: center; gap: 14px; text-align: left; }
    .homepage-belt-journey__track article > a { min-height: 0; flex-direction: row; align-items: center; gap: 14px; padding: 14px 16px; text-align: left; }
    .homepage-belt-journey__track b { flex: 0 0 38px; margin: 0; }
    .homepage-belt-journey__track span { margin: 2px 0 0; }
}