/* 
    Sky-Line Summer 2026 – Premium Landing Page
    Layout inspired by Trường Xanh Tuệ Đức
    Color Palette:
    - Primary: #01a49d (Sky-Line Teal)
    - Secondary: #ffb800 (Sunrise Yellow)  
    - Accent: #ff6b35 (Energy Orange)
    - Dark: #0f172a
    - Light: #f0fdf4
*/

:root {
    --primary: #01a49d;
    --primary-dark: #008a84;
    --primary-light: rgba(1, 164, 157, 0.1);
    --primary-glow: rgba(1, 164, 157, 0.25);
    --secondary: #ffb800;
    --secondary-dark: #e5a600;
    --accent: #ff6b35;
    --dark: #0f172a;
    --dark-2: #1e293b;
    --grey: #64748b;
    --grey-light: #94a3b8;
    --light: #f0fdf4;
    --light-2: #f8fafc;
    --white: #ffffff;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-full: 9999px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
    --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --container: 1200px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 140px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.7;
    color: var(--dark);
    background: var(--white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    line-height: 1.3;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul { list-style: none; }

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

.text-center { text-align: center; }

/* ===================== BUTTONS ===================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius-full);
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    font-size: 15px;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-sm { padding: 10px 24px; font-size: 14px; }
.btn-lg { padding: 16px 40px; font-size: 17px; }
.btn-block { display: flex; width: 100%; }

.btn-primary {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}
.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(1, 164, 157, 0.35);
}

.btn-secondary {
    background: var(--secondary);
    color: var(--dark);
    border-color: var(--secondary);
}
.btn-secondary:hover {
    background: var(--secondary-dark);
    border-color: var(--secondary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 184, 0, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}
.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-outline-light {
    background: rgba(255,255,255,0.15);
    color: var(--white);
    border-color: var(--white);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}
.btn-outline-light:hover {
    background: var(--white);
    color: var(--primary);
    transform: translateY(-2px);
}

.btn-cta {
    background: linear-gradient(135deg, var(--accent), #ff8f5e);
    color: var(--white);
    border: none;
    font-size: 18px;
    padding: 18px 48px;
    box-shadow: 0 8px 30px rgba(255, 107, 53, 0.3);
}
.btn-cta:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 40px rgba(255, 107, 53, 0.45);
}

.pulse-animation {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(255, 107, 53, 0.4); }
    50% { box-shadow: 0 0 0 15px rgba(255, 107, 53, 0); }
}

/* ===================== SECTION COMMON ===================== */
section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    margin-bottom: 60px;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.tag-light {
    background: rgba(255,255,255,0.2);
    color: var(--white);
}

.section-header h2 {
    font-size: 40px;
    color: var(--dark);
    margin-bottom: 16px;
    position: relative;
}

.section-subtitle {
    font-size: 17px;
    color: var(--grey);
    max-width: 650px;
    margin: 0 auto;
}

.section-cta {
    margin-top: 48px;
}

/* ===================== HEADER ===================== */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 12px 0;
    transition: var(--transition);
}

.main-header.scrolled {
    padding: 8px 0;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 30px rgba(0,0,0,0.08);
}

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

.logo img {
    height: 48px;
    transition: var(--transition);
}

.scrolled .logo img {
    height: 40px;
}

.main-nav ul {
    display: flex;
    gap: 28px;
}

.main-nav a {
    font-weight: 500;
    font-size: 13px;
    color: var(--dark-2);
    position: relative;
    padding: 4px 0;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.main-nav a:hover { color: var(--primary); }
.main-nav a:hover::after { width: 100%; }

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-phone {
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
}
.header-phone:hover { color: var(--primary-dark); }

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===================== SUB NAVIGATION ===================== */
.sub-nav {
    position: sticky;
    top: 72px;
    z-index: 990;
    background: var(--primary);
    padding: 0;
    box-shadow: 0 4px 15px rgba(1, 164, 157, 0.3);
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.sub-nav.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
}

.sub-nav-list {
    display: flex;
    justify-content: center;
    gap: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.sub-nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 24px;
    color: rgba(255,255,255,0.85);
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    font-size: 13px;
    white-space: nowrap;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
}

.sub-nav-link:hover,
.sub-nav-link.active {
    color: var(--white);
    background: rgba(255,255,255,0.1);
    border-bottom-color: var(--secondary);
}

.sub-nav-link i {
    font-size: 14px;
}

/* ===================== HERO ===================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding: 0;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(15, 23, 42, 0.8) 0%,
        rgba(1, 164, 157, 0.5) 50%,
        rgba(15, 23, 42, 0.7) 100%
    );
}

.hero-particles {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
}

.hero-particle {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 184, 0, 0.3);
    animation: floatParticle linear infinite;
}

@keyframes floatParticle {
    0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-100px) rotate(720deg); opacity: 0; }
}

.hero-content {
    position: relative;
    z-index: 2;
    color: var(--white);
    padding-top: 120px;
    padding-bottom: 60px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: rgba(255, 184, 0, 0.2);
    border: 1px solid rgba(255, 184, 0, 0.4);
    color: var(--secondary);
    border-radius: var(--radius-full);
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 1px;
    margin-bottom: 24px;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.hero h1 {
    font-size: 60px;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
    text-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.hero h1 .highlight {
    display: block;
    background: linear-gradient(135deg, var(--secondary), #ffd666);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    line-height: 1.8;
    max-width: 650px;
    opacity: 0.92;
    margin-bottom: 36px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 50px;
}

.hero-stats {
    display: flex;
    gap: 48px;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.2);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-family: 'Montserrat', sans-serif;
    font-size: 42px;
    font-weight: 900;
    color: var(--secondary);
    line-height: 1;
}

.stat-suffix {
    font-family: 'Montserrat', sans-serif;
    font-size: 28px;
    font-weight: 900;
    color: var(--secondary);
}

.stat-label {
    display: block;
    font-size: 14px;
    opacity: 0.8;
    margin-top: 4px;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.hero-scroll-indicator a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: 2px solid rgba(255,255,255,0.4);
    border-radius: 50%;
    color: var(--white);
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

/* ===================== PROGRAMS (LIST STYLE) ===================== */
.programs-section {
    background: var(--light-2);
}

/* Program Tabs */
.program-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-full);
    background: var(--white);
    color: var(--grey);
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 15px var(--primary-glow);
}

/* Programs Grid - List/Card Style (like Trường Xanh) */
.programs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.program-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.program-card-link:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.program-card-link.hidden {
    display: none;
}

.program-card-compact {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: var(--white);
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.program-card-link:hover .program-card-compact {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(1, 164, 157, 0.03), rgba(255, 184, 0, 0.03));
}

.program-emoji {
    font-size: 36px;
    line-height: 1;
    flex-shrink: 0;
    width: 50px;
    text-align: center;
}

.program-info {
    flex: 1;
    min-width: 0;
}

.program-info h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 6px;
}

.program-meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
}

.program-date {
    font-size: 13px;
    color: var(--grey);
}

.program-date i {
    color: var(--primary);
    margin-right: 4px;
}

.program-stars {
    font-size: 13px;
    color: var(--grey);
}

.program-arrow {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 14px;
    transition: var(--transition);
}

.program-card-link:hover .program-arrow {
    background: var(--primary);
    color: var(--white);
    transform: translateX(4px);
}

/* ===================== DIFFERENCES ===================== */
.differences-section {
    background: linear-gradient(135deg, var(--primary) 0%, #0d9488 50%, var(--primary-dark) 100%);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.differences-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,184,0,0.1), transparent 70%);
    border-radius: 50%;
}

.differences-section::after {
    content: '';
    position: absolute;
    bottom: -40%;
    left: -15%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255,255,255,0.05), transparent 70%);
    border-radius: 50%;
}

.differences-section .section-header h2 { color: var(--white); }
.differences-section .section-subtitle { color: rgba(255,255,255,0.8); }

.diff-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 48px;
}

.diff-card {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
}

.diff-card:hover {
    background: rgba(255,255,255,0.18);
    transform: translateY(-5px);
}

.diff-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin: 0 auto 18px;
    background: rgba(255,255,255,0.15);
    color: var(--white);
}

.diff-icon.icon-orange { background: rgba(255,184,0,0.3); color: var(--secondary); }
.diff-icon.icon-purple { background: rgba(139,92,246,0.3); color: #c4b5fd; }
.diff-icon.icon-green { background: rgba(16,185,129,0.3); color: #6ee7b7; }
.diff-icon.icon-red { background: rgba(239,68,68,0.3); color: #fca5a5; }
.diff-icon.icon-blue { background: rgba(59,130,246,0.3); color: #93c5fd; }
.diff-icon.icon-pink { background: rgba(236,72,153,0.3); color: #f9a8d4; }
.diff-icon.icon-teal { background: rgba(20,184,166,0.3); color: #5eead4; }

.diff-card h4 {
    font-size: 16px;
    margin-bottom: 8px;
}

.diff-card p {
    font-size: 13px;
    opacity: 0.85;
    line-height: 1.6;
}

.diff-cta { margin-top: 24px; }

.cta-timer {
    animation: shake 1.5s ease-in-out infinite;
    display: inline-block;
}

@keyframes shake {
    0%, 100% { transform: rotate(0); }
    25% { transform: rotate(10deg); }
    50% { transform: rotate(-10deg); }
    75% { transform: rotate(5deg); }
}

/* ===================== REASONS ===================== */
.reasons-section {
    background: var(--light-2);
}

.reasons-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.reason-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.reason-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: var(--transition);
}

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

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

.reason-number {
    font-family: 'Montserrat', sans-serif;
    font-size: 14px;
    font-weight: 800;
    color: var(--primary);
    opacity: 0.4;
    margin-bottom: 4px;
}

.reason-icon {
    font-size: 40px;
    margin-bottom: 16px;
    line-height: 1;
}

.reason-card h4 {
    font-size: 17px;
    color: var(--dark);
    margin-bottom: 10px;
}

.reason-card p {
    font-size: 14px;
    color: var(--grey);
    line-height: 1.6;
}

/* ===================== CONTENT AREAS ===================== */
.content-section {
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
    color: var(--white);
}

.content-section .section-header h2 { color: var(--white); }
.content-section .section-subtitle { color: rgba(255,255,255,0.7); }

.content-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.content-card {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    transition: var(--transition);
}

.content-card:hover {
    background: rgba(255,255,255,0.12);
    transform: translateY(-4px);
    border-color: rgba(255,255,255,0.2);
}

.content-icon-wrap {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
    background: var(--primary-glow);
    color: var(--primary);
}

.content-icon-wrap.icon-orange { background: rgba(255,184,0,0.2); color: var(--secondary); }
.content-icon-wrap.icon-purple { background: rgba(139,92,246,0.2); color: #a78bfa; }
.content-icon-wrap.icon-red { background: rgba(239,68,68,0.2); color: #f87171; }
.content-icon-wrap.icon-pink { background: rgba(236,72,153,0.2); color: #f472b6; }
.content-icon-wrap.icon-green { background: rgba(16,185,129,0.2); color: #34d399; }
.content-icon-wrap.icon-blue { background: rgba(59,130,246,0.2); color: #60a5fa; }
.content-icon-wrap.icon-teal { background: rgba(20,184,166,0.2); color: #2dd4bf; }

.content-card h4 {
    font-size: 17px;
    margin-bottom: 16px;
    color: var(--white);
}

.content-card ul {
    list-style: none;
}

.content-card ul li {
    font-size: 14px;
    color: rgba(255,255,255,0.75);
    padding: 5px 0;
    padding-left: 20px;
    position: relative;
    line-height: 1.5;
}

.content-card ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary);
    font-weight: 700;
    font-size: 13px;
}

/* ===================== FACILITIES ===================== */
.facilities-section {
    background: var(--light-2);
}

.facility-showcase {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    margin-bottom: 48px;
    max-height: 450px;
}

.facility-showcase img {
    width: 100%;
    height: 450px;
    object-fit: cover;
}

.facility-overlay-badge {
    position: absolute;
    bottom: 20px;
    left: 20px;
    background: rgba(1, 164, 157, 0.9);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    color: var(--white);
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 15px;
}

.facilities-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.facility-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    text-align: center;
    border: 1px solid #e2e8f0;
}

.facility-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.facility-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin: 0 auto 18px;
    background: var(--primary-light);
    color: var(--primary);
}

.facility-card:hover .facility-icon {
    background: var(--primary);
    color: var(--white);
}

.facility-card h4 {
    font-size: 17px;
    color: var(--dark);
    margin-bottom: 10px;
}

.facility-card p {
    font-size: 14px;
    color: var(--grey);
    line-height: 1.6;
}

.facility-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* ===================== TRAINERS ===================== */
.trainers-section {
    background: linear-gradient(135deg, var(--primary) 0%, #0d9488 50%, var(--primary-dark) 100%);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.trainers-section .section-header h2 { color: var(--white); }
.trainers-section .section-subtitle { color: rgba(255,255,255,0.85); }

.trainers-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.trainer-card {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-lg);
    padding: 32px 20px;
    text-align: center;
    transition: var(--transition);
}

.trainer-card:hover {
    background: rgba(255,255,255,0.18);
    transform: translateY(-5px);
}

.trainer-avatar {
    position: relative;
    display: inline-block;
    margin-bottom: 20px;
}

.avatar-placeholder {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: var(--white);
    margin: 0 auto;
    border: 3px solid rgba(255,255,255,0.3);
}

.trainer-badge-wrap {
    position: absolute;
    bottom: -5px;
    right: -5px;
}

.trainer-badge-wrap span {
    display: inline-block;
    background: var(--secondary);
    color: var(--dark);
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 700;
    font-family: 'Montserrat', sans-serif;
}

.trainer-card h4 {
    font-size: 17px;
    margin-bottom: 6px;
}

.trainer-role {
    display: block;
    font-size: 13px;
    color: var(--secondary);
    font-weight: 600;
    margin-bottom: 12px;
}

.trainer-card p {
    font-size: 13px;
    opacity: 0.85;
    line-height: 1.6;
}

.trainers-summary {
    margin-top: 24px;
}

.summary-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
}

.summary-number {
    font-family: 'Montserrat', sans-serif;
    font-size: 48px;
    font-weight: 900;
    color: var(--secondary);
    line-height: 1;
}

.summary-label {
    font-size: 14px;
    opacity: 0.85;
    margin-top: 8px;
}

/* ===================== TESTIMONIALS ===================== */
.testimonials-section {
    background: var(--light-2);
}

.trust-badges {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-top: 12px;
    font-size: 15px;
    color: var(--grey);
}

.testimonials-slider {
    overflow: hidden;
    position: relative;
}

.testimonial-track {
    display: flex;
    gap: 24px;
    transition: transform 0.5s ease;
}

.testimonial-card {
    min-width: calc(33.333% - 16px);
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-md);
    flex-shrink: 0;
}

.testimonial-stars {
    font-size: 16px;
    margin-bottom: 16px;
}

.testimonial-card p {
    font-size: 15px;
    color: var(--dark-2);
    line-height: 1.7;
    margin-bottom: 20px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), #0d9488);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
}

.testimonial-author strong {
    display: block;
    font-size: 14px;
    color: var(--dark);
}

.testimonial-author span {
    display: block;
    font-size: 12px;
    color: var(--grey);
}

.slider-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 32px;
}

.slider-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid #e2e8f0;
    background: var(--white);
    color: var(--dark);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.slider-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.slider-dots {
    display: flex;
    gap: 8px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #e2e8f0;
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--primary);
    transform: scale(1.2);
}

/* ===================== GALLERY ===================== */
.gallery-section {
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
    color: var(--white);
}

.gallery-section .section-header h2 { color: var(--white); }
.gallery-section .section-subtitle { color: rgba(255,255,255,0.7); }

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: 220px;
    gap: 16px;
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
}

.gallery-item.gallery-wide {
    grid-column: span 2;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%);
    display: flex;
    align-items: flex-end;
    padding: 20px;
    opacity: 0;
    transition: var(--transition);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-overlay span {
    color: var(--white);
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    font-size: 15px;
}

/* ===================== REGISTRATION ===================== */
.register-section {
    background: linear-gradient(135deg, var(--primary) 0%, #0d9488 100%);
    color: var(--white);
    padding: 80px 0;
}

.register-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}

.register-info h2 {
    font-size: 36px;
    color: var(--white);
    margin-bottom: 16px;
}

.register-info > p {
    font-size: 17px;
    opacity: 0.92;
    margin-bottom: 32px;
    line-height: 1.7;
}

.countdown-box {
    background: rgba(255,255,255,0.12);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 32px;
    border: 1px solid rgba(255,255,255,0.2);
}

.countdown-label {
    font-weight: 600;
    margin-bottom: 12px;
    font-size: 15px;
}

.countdown-timer {
    display: flex;
    gap: 12px;
    align-items: center;
}

.countdown-unit {
    text-align: center;
    background: rgba(255,255,255,0.15);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    min-width: 60px;
}

.countdown-unit span {
    display: block;
    font-family: 'Montserrat', sans-serif;
    font-size: 28px;
    font-weight: 800;
    color: var(--secondary);
}

.countdown-unit small {
    font-size: 11px;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.countdown-sep {
    font-size: 24px;
    font-weight: 700;
    color: rgba(255,255,255,0.5);
}

.register-benefits {
    list-style: none;
}

.register-benefits li {
    padding: 8px 0;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.register-benefits i {
    color: var(--secondary);
    font-size: 18px;
}

.register-form-wrap {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: 36px;
    box-shadow: var(--shadow-xl);
}

.register-form h3 {
    color: var(--dark);
    font-size: 22px;
    margin-bottom: 24px;
    text-align: center;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 6px;
}

.form-group label span {
    color: #ef4444;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: var(--radius-sm);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    color: var(--dark);
    background: var(--white);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-note {
    text-align: center;
    font-size: 13px;
    color: var(--grey);
    margin-top: 12px;
}

.form-note i {
    margin-right: 4px;
    color: var(--primary);
}

/* ===================== FOOTER ===================== */
.main-footer {
    background: var(--dark);
    color: rgba(255,255,255,0.8);
    padding: 0 0 30px;
}

.footer-top {
    padding: 48px 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-cta-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-xl);
    padding: 32px 40px;
}

.footer-cta-text h3 {
    font-size: 24px;
    color: var(--secondary);
    margin-bottom: 6px;
}

.footer-cta-text p {
    font-size: 15px;
    opacity: 0.8;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr;
    gap: 40px;
    padding: 48px 0;
}

.footer-brand img {
    height: 40px;
    margin-bottom: 16px;
    filter: brightness(0) invert(1);
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 16px;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

.footer-links h4,
.footer-contact h4 {
    color: var(--white);
    font-size: 16px;
    margin-bottom: 20px;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    font-size: 14px;
    opacity: 0.75;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--primary);
    padding-left: 4px;
}

.footer-contact p {
    font-size: 14px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-contact i {
    color: var(--primary);
    width: 16px;
    text-align: center;
}

.footer-contact a:hover {
    color: var(--primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 14px;
    opacity: 0.6;
}

/* ===================== FLOATING ACTIONS ===================== */
.floating-actions {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.fab-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    color: var(--white);
    font-size: 20px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.fab-phone { background: #10b981; }

.fab-register {
    width: auto;
    padding: 14px 24px;
    border-radius: var(--radius-full);
    background: var(--accent);
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 14px;
}

.fab-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow-xl);
}

/* ===================== BACK TO TOP ===================== */
.back-to-top {
    position: fixed;
    left: 24px;
    bottom: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    border: none;
    font-size: 18px;
    cursor: pointer;
    z-index: 999;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* ===================== SCROLL ANIMATIONS ===================== */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* ===================== MOBILE NAV OVERLAY ===================== */
.mobile-nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 998;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.mobile-nav-overlay.active {
    opacity: 1;
    pointer-events: all;
}

/* ===================== RESPONSIVE ===================== */
@media (max-width: 1024px) {
    .hero h1 { font-size: 46px; }
    .section-header h2 { font-size: 32px; }
    .programs-grid { grid-template-columns: 1fr; }
    .diff-grid { grid-template-columns: repeat(2, 1fr); }
    .content-grid { grid-template-columns: repeat(2, 1fr); }
    .trainers-grid { grid-template-columns: repeat(2, 1fr); }
    .facilities-grid { grid-template-columns: repeat(2, 1fr); }
    .register-wrapper { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .gallery-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-stats { gap: 24px; flex-wrap: wrap; }
    .testimonial-card { min-width: calc(50% - 12px); }

    .main-nav {
        position: fixed;
        top: 0;
        right: -300px;
        width: 280px;
        height: 100vh;
        background: var(--white);
        z-index: 999;
        padding: 80px 24px 24px;
        box-shadow: -5px 0 30px rgba(0,0,0,0.15);
        transition: right 0.3s ease;
    }

    .main-nav.mobile-active {
        right: 0;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 16px;
    }

    .main-nav a {
        font-size: 16px;
        padding: 8px 0;
    }

    .mobile-toggle {
        display: flex;
    }

    .header-phone {
        display: none;
    }

    .sub-nav-list {
        justify-content: flex-start;
        gap: 0;
    }

    .sub-nav-link {
        padding: 12px 16px;
        font-size: 12px;
    }
}

@media (max-width: 768px) {
    section { padding: 60px 0; }
    .hero h1 { font-size: 36px; }
    .hero-desc { font-size: 16px; }
    .hero-stats { gap: 16px; }
    .stat-number { font-size: 32px; }
    .section-header h2 { font-size: 26px; }
    .diff-grid { grid-template-columns: 1fr; }
    .content-grid { grid-template-columns: 1fr; }
    .reasons-grid { grid-template-columns: 1fr; }
    .trainers-grid { grid-template-columns: 1fr; }
    .facilities-grid { grid-template-columns: 1fr; }
    .gallery-grid { grid-template-columns: 1fr; grid-auto-rows: 200px; }
    .gallery-item.gallery-wide { grid-column: span 1; }
    .footer-grid { grid-template-columns: 1fr; }
    .summary-stats { flex-direction: column; gap: 24px; }
    .testimonial-card { min-width: 100%; }
    .form-row { grid-template-columns: 1fr; }
    .footer-cta-banner { flex-direction: column; gap: 16px; text-align: center; }

    .btn {
        white-space: normal;
        text-align: center;
        line-height: 1.4;
    }

    .btn-cta {
        font-size: 14px;
        padding: 12px 16px;
        width: 100%;
    }

    .facility-actions {
        flex-direction: column;
        align-items: center;
    }

    .countdown-timer {
        gap: 8px;
    }

    .countdown-unit {
        padding: 10px 12px;
        min-width: 50px;
    }

    .countdown-unit span {
        font-size: 22px;
    }

    .register-form-wrap {
        padding: 24px;
    }

    .sub-nav {
        top: 64px;
    }

    /* Floating buttons - smaller on mobile */
    .floating-actions {
        right: 12px !important;
        bottom: 16px !important;
        gap: 8px !important;
    }
    .fab-btn {
        width: 42px !important;
        height: 42px !important;
        font-size: 16px !important;
    }
    .back-to-top {
        left: 12px !important;
        bottom: 16px !important;
        width: 38px !important;
        height: 38px !important;
        font-size: 14px !important;
    }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 28px; }
    .hero-cta { flex-direction: column; }
    .hero-stats {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    .program-card-compact {
        padding: 16px;
    }
    .program-emoji { font-size: 28px; width: 40px; }
    .program-info h3 { font-size: 14px; }
}

/* ===================== MOBILE HERO FIX ===================== */

/* ===================== HERO DESKTOP/MOBILE IMAGE TOGGLE ===================== */
.hero-img-desktop { display: block; }
.hero-img-mobile { display: none; }

@media (max-width: 768px) {
    .hero-img-desktop { display: none !important; }
    .hero-img-mobile { display: block !important; width: 100%; height: auto; }
}
/* ===================== FOOTER MOBILE FIX ===================== */
@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr !important;
        gap: 10px !important;
    }
    .footer-links ul {
        margin: 0 !important;
    }
    .footer-links li {
        margin-bottom: 10px !important;
    }
}
@keyframes pulsePromo {
    0%, 100% { box-shadow: 0 8px 25px rgba(1, 164, 157, 0.4), 0 0 0 4px rgba(1, 164, 157, 0.15); }
    50% { box-shadow: 0 8px 30px rgba(1, 164, 157, 0.6), 0 0 0 8px rgba(1, 164, 157, 0.1); transform: scale(1.02); }
}


/* ===================== NEW MOBILE HERO FIX ===================== */
@media (max-width: 768px) {
    /* Header Fixes */
    .header-phone {
        display: none !important;
    }
    .main-header .container {
        display: flex !important;
        align-items: center !important;
        justify-content: space-between !important;
    }
    .header-actions {
        display: flex !important;
        align-items: center !important;
        gap: 12px !important;
        flex: 1 !important;
        justify-content: flex-end !important;
    }
    .btn-cta-header {
        padding: 10px 16px !important;
        font-size: 14px !important;
        white-space: nowrap !important;
        line-height: 1.2 !important;
        flex: 0 1 auto !important;
        text-align: center !important;
        /* Ensure it doesn't wrap into a circle */
        min-width: 120px !important;
    }
    .mobile-toggle {
        margin-left: 0 !important;
    }

    /* Hero Height & Background Fixes */
    .hero {
        height: auto !important;
        min-height: auto !important; /* Let text dictate height so image doesn't get wildly cropped vertically */
        padding-top: 120px !important;
        padding-bottom: 60px !important;
        display: flex !important;
        align-items: center !important;
    }
    .hero-bg {
        position: absolute !important;
        top: 0; left: 0; right: 0; bottom: 0;
        inset: 0 !important;
        width: 100% !important;
        height: 100% !important;
    }
    .hero-bg img {
        width: 100% !important;
        height: 100% !important;
        object-fit: cover !important;
        object-position: center 30% !important; /* Focus on faces/action */
    }
    /* Dim the gradient so text is readable if image is shorter */
    .hero-overlay {
        background: linear-gradient(to bottom, rgba(0,40,40,0.7) 0%, rgba(0,40,40,0.85) 100%) !important;
    }

    /* Typography & Buttons Fixes */
    .hero h1 {
        font-size: 26px !important;
        line-height: 1.35 !important;
        margin-bottom: 16px !important;
        text-align: left !important;
    }
    .hero .container {
        padding: 0 20px !important;
        transform: translateY(0) !important;
    }
    
    .hero [style*="linear-gradient(135deg, #01a49d, #10b981)"] {
         font-size: 13px !important; 
         padding: 8px 12px !important;
         margin-bottom: 20px !important;
         white-space: normal !important;
         line-height: 1.4 !important;
         display: inline-block !important;
    }

    .hero-cta {
        flex-direction: column !important;
        gap: 12px !important;
        width: 100% !important;
    }
    .hero-cta .btn {
        width: 100% !important;
        font-size: 16px !important;
        padding: 14px 20px !important;
        text-align: center !important;
    }
    
    .hero .info-panel {
        font-size: 14px !important;
        padding: 16px !important;
        flex-direction: column !important;
        gap: 12px !important;
    }
}

/* ===================== NEW MOBILE TYPOGRAPHY FIX ===================== */
@media (max-width: 768px) {
    /* Override all inline styles for section headers */
    .section-header h2,
    .section-header h3 {
        font-size: 24px !important;
        line-height: 1.35 !important;
        margin-bottom: 24px !important;
        padding: 0 10px !important;
    }
    
    .section-header {
        margin-bottom: 30px !important;
    }
    
    /* Make subtitles smaller */
    .section-header p {
        font-size: 15px !important;
        padding: 0 10px !important;
    }
    
    /* Global spacing adjustments for mobile */
    section {
        padding: 50px 0 !important;
    }
}
@media (max-width: 480px) {
    .section-header h2,
    .section-header h3 {
        font-size: 22px !important;
    }
}


/* ===================== ROBUST HEADER LAYOUT FIX ===================== */
@media (max-width: 768px) {
    .main-header .container {
        flex-wrap: nowrap !important; /* Ngăn chặn rớt dòng */
    }
    .logo-wrap {
        order: 1 !important;
        flex: 0 0 auto !important;
    }
    .logo img {
        max-height: 38px !important; /* Thu nhỏ logo tí xíu để nhường chỗ */
    }
    .header-actions {
        order: 2 !important;
        flex: 1 1 auto !important;
        display: flex !important;
        justify-content: flex-end !important;
        margin-right: 10px !important;
    }
    .btn-cta-header {
        font-size: 13px !important;
        padding: 8px 12px !important;
        min-width: auto !important; 
        white-space: nowrap !important;
        line-height: 1 !important;
    }
    .mobile-toggle {
        order: 3 !important;
        flex: 0 0 auto !important;
        margin-left: 0 !important;
        padding: 5px !important; /* Giảm vùng đệm để tiết kiệm không gian */
    }
}