/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* ===== BẢNG MÀU XANH CỰC NHẠT – AIRY SKY ===== */
    --primary-color: #bae6fd;        /* sky-200 – màu chính cực nhạt */
    --primary-dark: #7dd3fc;         /* sky-300 – hover/accent nhẹ */
    --primary-deeper: #38bdf8;       /* sky-400 – điểm nhấn icon/link */
    --primary-action: #0ea5e9;       /* sky-500 – nút bấm chính */
    --primary-light: #e0f2fe;        /* sky-100 – nền badge */
    --primary-pale: #f0f9ff;         /* sky-50  – nền section nhạt */
    --primary-ultra: #f8fdff;        /* cực nhạt – nền card */
    --secondary-color: #0369a1;      /* sky-700 – footer / heading */

    /* Text – đủ tương phản trên nền cực sáng */
    --text-primary: #075985;         /* sky-800 – chính, đủ tương phản */
    --text-secondary: #0369a1;       /* sky-700 */
    --text-muted: #38bdf8;           /* sky-400 */
    --text-on-dark: #ffffff;
    --text-body: #1e3a4f;            /* trung tính, dễ đọc */

    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fdff;         /* gần trắng – hơi xanh rất nhạt */
    --bg-card: #ffffff;              /* trắng tinh */
    --hero-bg: #f0f9ff;              /* sky-50 – hero cực nhạt */

    /* Border – rất nhạt */
    --border-color: #f0f9ff;         /* sky-50 – cực nhạt */
    --border-card: #e0f2fe;          /* sky-100 – nhạt */

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #ffffff 0%, #f0f9ff 50%, #e0f2fe 100%);
    --gradient-hero:    linear-gradient(160deg, #ffffff 0%, #f0f9ff 40%, #e0f2fe 80%, #bae6fd 100%);
    --gradient-btn:     linear-gradient(135deg, #38bdf8 0%, #0ea5e9 100%);
    --gradient-deep:    linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
    --gradient-cta:     linear-gradient(135deg, #0ea5e9 0%, #0369a1 100%);
    --gradient-soft:    linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);

    /* Shadows – cực nhẹ */
    --shadow-sm: 0 1px 4px rgba(14, 165, 233, 0.05);
    --shadow-md: 0 4px 12px rgba(14, 165, 233, 0.08);
    --shadow-lg: 0 10px 24px rgba(14, 165, 233, 0.12);
    --shadow-xl: 0 20px 40px rgba(14, 165, 233, 0.16);
}

/* ===== BASE ===== */
body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-body);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== HEADER ===== */
.header {
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(16px);
    border-bottom: 2px solid var(--border-color);
    box-shadow: 0 2px 16px rgba(186, 230, 253, 0.30);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0.9rem 0;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    font-weight: 800;
    font-size: 1.5rem;
    letter-spacing: -0.025em;
}

.logo-text {
    background: var(--gradient-btn);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo i {
    color: #e63946;
    font-size: 1.6rem;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s ease;
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link i { font-size: 1rem; }

.nav-link:hover,
.nav-link.active {
    color: var(--primary-deeper);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    right: 0;
    height: 2.5px;
    background: var(--gradient-btn);
    border-radius: 2px;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--primary-deeper);
    cursor: pointer;
}

/* ===== HERO – rất nhạt, sáng như bầu trời ===== */
.hero {
    background: var(--gradient-hero);
    color: var(--text-primary);
    padding: 8rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -120px;
    right: -120px;
    width: 450px;
    height: 450px;
    background: rgba(255, 255, 255, 0.45);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -100px;
    left: -100px;
    width: 350px;
    height: 350px;
    background: rgba(255, 255, 255, 0.30);
    border-radius: 50%;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
}

.title-glow {
    color: var(--primary-deeper);
    text-shadow: 0 0 28px rgba(14, 165, 233, 0.25);
}

.hero-tagline {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.hero-description {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 3rem;
    color: var(--text-primary);
    opacity: 0.85;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: 9999px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--gradient-btn);
    color: white;
    box-shadow: 0 6px 20px rgba(14, 165, 233, 0.35);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 28px rgba(14, 165, 233, 0.45);
    filter: brightness(1.07);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.70);
    backdrop-filter: blur(8px);
    color: var(--primary-deeper);
    border: 2px solid var(--primary-dark);
    margin-left: 1rem;
}

.btn-secondary:hover {
    background: white;
    border-color: var(--primary-deeper);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===== SECTION STYLES ===== */
section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-subtitle {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: var(--primary-pale);
    color: var(--primary-deeper);
    border: 1px solid var(--primary-light);
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--secondary-color);
}

/* ===== SERVICES / COURSE CARDS ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
}

.service-card {
    background: var(--bg-card);
    padding: 3rem;
    border-radius: 2rem;
    border: 1.5px solid var(--border-card);
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-btn);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-dark);
    background: white;
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon {
    width: 70px;
    height: 70px;
    background: var(--primary-pale);
    border-radius: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    color: var(--primary-deeper);
    font-size: 2rem;
    transition: all 0.3s ease;
}

.service-card:hover .service-icon {
    background: var(--gradient-btn);
    color: white;
}

.service-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.service-text {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.btn-link {
    color: var(--primary-deeper);
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.95rem;
    transition: gap 0.2s ease, color 0.2s ease;
}

.btn-link:hover {
    color: var(--secondary-color);
    gap: 0.7rem;
}

/* ===== ABOUT SECTION ===== */
.about {
    background: var(--bg-secondary);
}

.about-content {
    background: white;
    border-radius: 1.5rem;
    border: 1.5px solid var(--border-card);
    box-shadow: var(--shadow-md);
    padding: 2.5rem;
}

.instructor-name {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.instructor-name-alt {
    color: var(--primary-deeper);
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.instructor-intro {
    font-size: 1.05rem;
    color: var(--primary-deeper);
    margin-bottom: 1rem;
}

.instructor-description {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 1.2rem;
    line-height: 1.8;
}

.quote,
blockquote.quote {
    border-left: 4px solid var(--primary-dark);
    padding: 1rem 1.5rem;
    background: var(--primary-pale);
    border-radius: 0 1rem 1rem 0;
    font-style: italic;
    color: var(--secondary-color);
    font-size: 1.1rem;
    margin: 1.5rem 0;
}

.instructor-note {
    background: var(--primary-ultra);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1rem 1.5rem;
    margin-top: 1.5rem;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.feature-list { list-style: none; }

.feature-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--text-body);
}

.feature-item i { color: var(--primary-deeper); }

/* ===== ABOUT PAGE EXTRAS ===== */
.about-subtitle {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin: 2rem 0 1rem;
}

.about-list {
    list-style: none;
    margin-bottom: 1.5rem;
}

.about-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.7rem;
    color: var(--text-primary);
    line-height: 1.7;
}

.about-list li::before {
    content: '✦';
    position: absolute;
    left: 0;
    color: var(--primary-dark);
    font-size: 0.75rem;
    top: 4px;
}

.journey-content {
    max-width: 800px;
    margin: 0 auto;
}

.ps-card {
    background: white;
    border: 1.5px solid var(--border-card);
    border-radius: 1.5rem;
    padding: 2.5rem;
    max-width: 800px;
    margin: 0 auto;
    box-shadow: var(--shadow-md);
}

.ps-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    color: var(--primary-deeper);
}

.ps-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.ps-text {
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.ps-link {
    color: var(--primary-deeper);
    font-weight: 600;
    text-decoration: none;
}

.ps-link:hover { text-decoration: underline; }

/* ===== CTA SECTION ===== */
.cta {
    background: var(--gradient-cta);
    color: white;
    text-align: center;
    border-radius: 3rem;
    margin: 4rem 20px;
    padding: 5rem 2rem;
    box-shadow: var(--shadow-xl);
}

.cta-title {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: 1.5rem;
    color: #ffffff;
}

.cta-text {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.90);
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--secondary-color);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
    margin-bottom: 2rem;
    text-align: left;
}

.footer-brand h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-light);
    margin-bottom: 1rem;
}

.footer-quote {
    font-size: 1.05rem;
    font-style: italic;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-top: 1rem;
}

.footer-link-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.10);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 0.5rem;
    color: white;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.footer-link-btn:hover {
    background: rgba(255, 255, 255, 0.20);
    border-color: rgba(255, 255, 255, 0.38);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.footer-link-btn i { font-size: 1.25rem; flex-shrink: 0; }

.footer-link-btn span {
    flex: 1;
    text-align: left;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Footer Button Brand Colors */
.footer-btn-youtube         { background: #FF0000 !important; border-color: #FF0000 !important; }
.footer-btn-facebook-1      { background: #1877F2 !important; border-color: #1877F2 !important; }
.footer-btn-facebook-ai     { background: #8A2BE2 !important; border-color: #8A2BE2 !important; }
.footer-btn-facebook-python { background: var(--primary-deeper) !important; border-color: var(--primary-deeper) !important; }

.footer-contact h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--primary-light);
}

.footer-contact p {
    margin-bottom: 0.75rem;
    color: rgba(255, 255, 255, 0.80);
}

.footer-contact a {
    color: var(--primary-pale);
    text-decoration: none;
    font-weight: 600;
}

.footer-contact a:hover { color: #ffffff; }

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.875rem;
}

/* ===== FLOATING SOCIAL BUTTONS ===== */
.floating-buttons {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.floating-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
    position: relative;
    font-size: 1.5rem;
}

.floating-btn:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: var(--shadow-xl);
}

.floating-btn-youtube  { background: linear-gradient(135deg, #FF0000, #CC0000); }
.floating-btn-facebook { background: linear-gradient(135deg, #1877F2, #0C63D4); }
.floating-btn-zalo     { background: #ffffff; border: 2px solid #0068FF; }

.zalo-logo-icon { width: 36px; height: 36px; object-fit: contain; }

.floating-btn-tooltip {
    position: absolute;
    right: 75px;
    background: #0c2d48;
    color: white;
    padding: 5px 15px;
    border-radius: 5px;
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.floating-btn:hover .floating-btn-tooltip {
    opacity: 1;
    visibility: visible;
    right: 70px;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}

.hero-content > * {
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}

.hero-title       { animation-delay: 0.2s; }
.hero-tagline     { animation-delay: 0.4s; }
.hero-description { animation-delay: 0.6s; }
.hero-cta         { animation-delay: 0.8s; }

@media (max-width: 1024px) {
    .about-flex { flex-direction: column; gap: 3rem; }
    .contact-grid { grid-template-columns: 1fr; }
    .process-steps { flex-direction: column; }
    .process-arrow { transform: rotate(90deg); }
}

@media (max-width: 768px) {
    .nav-list { display: none; }
    .mobile-menu-toggle { display: block; }
    .hero-title { font-size: 2.5rem; }
    .footer-content { grid-template-columns: 1fr; }
    .cta-title { font-size: 2rem; }
    .services-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .why-grid { grid-template-columns: 1fr; }
    .about-info-grid { grid-template-columns: 1fr; }
    .faq-grid { grid-template-columns: 1fr; }
}

/* ===== HERO BADGE ===== */
.hero-badge {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: rgba(255,255,255,0.25);
    border: 1px solid rgba(255,255,255,0.5);
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    backdrop-filter: blur(6px);
}

/* ===== STATS SECTION ===== */
.stats-section {
    padding: 3.5rem 0;
    background: white;
    border-bottom: 2px solid var(--border-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    text-align: center;
}

.stat-item {
    padding: 1.5rem;
    border-radius: 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    font-size: 1.75rem;
    color: var(--primary-deeper);
    margin-bottom: 0.75rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--secondary-color);
    line-height: 1;
    margin-bottom: 0.4rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* ===== WHY US SECTION ===== */
.why-us {
    background: white;
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.why-card {
    background: var(--bg-secondary);
    border: 1.5px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 2.5rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.why-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
    background: white;
}

.why-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-pale);
    border-radius: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: var(--primary-deeper);
    margin: 0 auto 1.25rem;
    transition: all 0.3s ease;
}

.why-card:hover .why-icon {
    background: var(--gradient-btn);
    color: white;
}

.why-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 0.75rem;
}

.why-card p {
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.7;
}

/* ===== SERVICE FEATURES LIST ===== */
.service-features {
    list-style: none;
    margin-bottom: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.service-features li i {
    color: var(--primary-deeper);
    font-size: 0.9rem;
    flex-shrink: 0;
}

/* ===== ABOUT INFO GRID ===== */
.about-info-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 2.5rem;
    align-items: start;
}

.about-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-top: 1.5rem;
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.9rem;
    background: var(--primary-ultra);
    border: 1px solid var(--primary-pale);
    color: var(--primary-deeper);
    border-radius: 9999px;
    font-size: 0.82rem;
    font-weight: 600;
}

.about-stats-side {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.about-stat-card {
    background: var(--bg-secondary);
    border: 1.5px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.25rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all 0.3s ease;
}

.about-stat-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    background: white;
}

.about-stat-card i {
    font-size: 1.5rem;
    color: var(--primary-deeper);
    width: 36px;
    text-align: center;
    flex-shrink: 0;
}

.about-stat-card strong {
    display: block;
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--secondary-color);
}

.about-stat-card span {
    font-size: 0.82rem;
    color: var(--text-primary);
    line-height: 1.4;
}

/* ===== PROCESS STEPS ===== */
.process-section {
    background: var(--bg-secondary);
}

.process-steps {
    display: flex;
    align-items: flex-start;
    gap: 0;
    position: relative;
}

.process-step {
    flex: 1;
    text-align: center;
    padding: 2rem 1.5rem;
    background: white;
    border-radius: 1.5rem;
    border: 1.5px solid var(--border-color);
    margin: 0 0.5rem;
    transition: all 0.3s ease;
}

.process-step:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
    transform: translateY(-6px);
}

.step-number {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--primary-pale);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.step-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-ultra);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-deeper);
    margin: 0 auto 1rem;
}

.process-step h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 0.75rem;
}

.process-step p {
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.6;
}

.process-arrow {
    font-size: 1.5rem;
    color: var(--primary-light);
    display: flex;
    align-items: center;
    padding-top: 5rem;
    flex-shrink: 0;
}

/* ===== CTA ACTIONS ===== */
.cta-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
}

/* ===== PAGE HERO (inner pages) ===== */
.page-hero {
    background: var(--gradient-hero);
    padding: 5rem 0 4rem;
    text-align: center;
    border-bottom: 2px solid var(--border-card);
}

.page-hero-content { max-width: 700px; margin: 0 auto; }

.page-hero-content .section-subtitle { margin-bottom: 1rem; }

.page-hero-content .section-title {
    font-size: 2.8rem;
    margin-bottom: 1rem;
}

.page-hero-desc {
    font-size: 1.1rem;
    color: var(--text-primary);
    line-height: 1.7;
    opacity: 0.85;
}

/* ===== SERVICE DETAIL (services page) ===== */
.service-detail-section { padding: 5rem 0; }

.service-detail-card {
    background: white;
    border-radius: 2rem;
    border: 1.5px solid var(--border-card);
    padding: 3rem;
    box-shadow: var(--shadow-md);
}

.service-detail-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.service-detail-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-ultra);
    border-radius: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.25rem;
    color: var(--primary-deeper);
    flex-shrink: 0;
}

.service-number {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary-deeper);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.service-detail-title {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--secondary-color);
    margin-top: 0.25rem;
}

.service-detail-intro {
    font-size: 1.05rem;
    color: var(--text-primary);
    line-height: 1.8;
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.service-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem;
    margin-bottom: 2.5rem;
}

.detail-feature {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--bg-secondary);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    transition: all 0.25s ease;
}

.detail-feature:hover {
    border-color: var(--primary-light);
    background: white;
    box-shadow: var(--shadow-md);
}

.detail-feature > i {
    font-size: 1.4rem;
    color: var(--primary-deeper);
    margin-top: 0.2rem;
    flex-shrink: 0;
    width: 28px;
    text-align: center;
}

.detail-feature strong {
    display: block;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 0.3rem;
}

.detail-feature p {
    font-size: 0.88rem;
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
}

.service-cta-inline {
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* ===== CONTACT PAGE ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.contact-form-card {
    background: white;
    border-radius: 2rem;
    border: 1.5px solid var(--border-card);
    padding: 3rem;
    box-shadow: var(--shadow-md);
}

.contact-info-col {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.contact-info-card {
    background: white;
    border: 1.5px solid var(--border-card);
    border-radius: 1.25rem;
    padding: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.contact-info-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}

.zalo-card {
    background: var(--primary-ultra);
    border-color: var(--primary-pale);
}

.contact-info-icon {
    width: 44px;
    height: 44px;
    background: var(--primary-pale);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--primary-deeper);
    flex-shrink: 0;
}

.contact-info-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 0.4rem;
}

.contact-info-card p {
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.6;
}

/* Form Styles */
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }

.form-label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.form-label i { color: var(--primary-deeper); }

.form-input {
    width: 100%;
    padding: 0.9rem 1rem;
    border: 1.5px solid var(--border-card);
    border-radius: 0.75rem;
    font-size: 0.95rem;
    color: var(--text-body);
    background: var(--bg-secondary);
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    outline: none;
}

.form-input:focus {
    border-color: var(--primary-dark);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
    background: white;
}

textarea.form-input { resize: vertical; }

/* Social Pills */
.social-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.9rem;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    color: white;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.social-pill:hover { transform: translateY(-2px); opacity: 0.9; }
.social-pill.youtube  { background: #FF0000; }
.social-pill.facebook { background: #1877F2; }

/* ===== FAQ SECTION ===== */
.faq-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border: 1.5px solid var(--border-card);
    border-radius: 1.25rem;
    padding: 1.75rem;
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.faq-q {
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.faq-q i {
    color: var(--primary-deeper);
    margin-top: 2px;
    flex-shrink: 0;
}

.faq-a {
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.7;
}

/* ===== SECTION DESC ===== */
.section-desc {
    font-size: 1.05rem;
    color: var(--text-primary);
    margin-top: 0.75rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

/* ===== PROCESS CARD – 1 CỘT ===== */
.process-card {
    max-width: 720px;
    margin: 0 auto;
    background: white;
    border: 1.5px solid var(--border-card);
    border-radius: 2rem;
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.process-row {
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 2rem 2.5rem;
    transition: background 0.2s ease;
}

.process-row:hover {
    background: var(--bg-secondary);
}

.process-num {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1;
    color: var(--primary-color);
    min-width: 72px;
    text-align: center;
    letter-spacing: -2px;
    flex-shrink: 0;
}

.process-body {
    flex: 1;
}

.process-row-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: 0.4rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.process-row-title i {
    color: var(--primary-deeper);
    font-size: 1rem;
}

.process-row-desc {
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.65;
}

.process-divider {
    height: 1px;
    background: var(--border-color);
    margin: 0 2.5rem;
}

/* ===== TIMELINE LAYOUT ===== */
.timeline {
    max-width: 680px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.tl-item {
    display: grid;
    grid-template-columns: 56px 2px 1fr;
    gap: 0 1.5rem;
    align-items: stretch;
}

.tl-item-last {
    grid-template-columns: 56px 1fr;
    gap: 0 1.5rem;
}

/* Badge số tròn */
.tl-badge {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 900;
    color: white;
    flex-shrink: 0;
    z-index: 1;
    box-shadow: 0 4px 14px rgba(14,165,233,0.25);
    letter-spacing: -0.5px;
}

.tl-badge-1 { background: linear-gradient(135deg, #7dd3fc, #38bdf8); }
.tl-badge-2 { background: linear-gradient(135deg, #38bdf8, #0ea5e9); }
.tl-badge-3 { background: linear-gradient(135deg, #0ea5e9, #0284c7); }
.tl-badge-4 { background: linear-gradient(135deg, #0284c7, #0369a1); }

/* Đường kẻ dọc nối các bước */
.tl-line {
    width: 2px;
    background: var(--border-card);
    margin: 0 auto;
    flex: 1;
    min-height: 24px;
}

/* Thẻ nội dung */
.tl-card {
    background: white;
    border-radius: 1.25rem;
    border: 1.5px solid var(--border-card);
    padding: 1.5rem 1.75rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.25s ease, transform 0.25s ease;
    border-left-width: 4px;
}

.tl-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.tl-card-1 { border-left-color: #7dd3fc; }
.tl-card-2 { border-left-color: #38bdf8; }
.tl-card-3 { border-left-color: #0ea5e9; }
.tl-card-4 { border-left-color: #0284c7; }

/* Tag nhỏ phía trên */
.tl-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--primary-deeper);
    background: var(--primary-pale);
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    margin-bottom: 0.65rem;
}

.tl-title {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.tl-desc {
    font-size: 0.93rem;
    color: var(--text-primary);
    line-height: 1.7;
}

/* Canh dọc badge và đường */
.tl-item > .tl-badge {
    margin-top: 0;
    align-self: start;
}

@media (max-width: 600px) {
    .tl-item,
    .tl-item-last {
        grid-template-columns: 44px 1fr;
        gap: 0 1rem;
    }
    .tl-line { display: none; }
    .tl-badge { width: 44px; height: 44px; font-size: 1rem; }
}