/* Import Modern Typography */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

/* Design Variables */
:root {
    --primary: #0F62FE;
    --primary-hover: #0353E9;
    --primary-light: #E8F1FF;
    --primary-glow: rgba(15, 98, 254, 0.15);
    
    --secondary: #00D8FF;
    --secondary-hover: #00B1D4;
    
    --zalo-color: #0068FF;
    --zalo-light: #E5F0FF;
    
    --success: #198754;
    --success-light: #D1E7DD;
    --danger: #DC3545;
    
    --dark: #0A192F;
    --dark-slate: #1E293B;
    --text-main: #334155;
    --text-light: #64748B;
    --text-white: #FFFFFF;
    
    --bg-main: #FFFFFF;
    --bg-sec: #F8FAFC;
    --bg-dark-hero: #0F172A;
    --bg-glass: rgba(255, 255, 255, 0.8);
    
    --border: #E2E8F0;
    --border-focus: #93C5FD;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 20px -3px rgba(15, 98, 254, 0.05), 0 4px 6px -4px rgba(15, 98, 254, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(15, 98, 254, 0.1), 0 8px 10px -6px rgba(15, 98, 254, 0.1);
    --shadow-phone: 0 25px 50px -12px rgba(10, 25, 47, 0.25);
    
    --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius-lg: 16px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    color: var(--text-main);
    background-color: var(--bg-main);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--dark);
    line-height: 1.25;
}

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

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* Typography Helpers */
.gradient-text {
    background: linear-gradient(135deg, var(--primary) 30%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Layout Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 6rem 0;
}

.section-bg {
    background-color: var(--bg-sec);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem auto;
}

.section-header h2 {
    font-size: 2.25rem;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-header p {
    color: var(--text-light);
    font-size: 1.125rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.75rem;
    font-weight: 600;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--text-white);
    box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-secondary {
    background-color: var(--white);
    color: var(--primary);
    border-color: var(--primary);
}

.btn-secondary:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
}

.btn-accent {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: var(--text-white);
    border: none;
    box-shadow: 0 4px 15px rgba(15, 98, 254, 0.3);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 22px rgba(15, 98, 254, 0.4);
}

/* Navigation Bar */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.header-scrolled {
    padding: 0.5rem 0;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary);
}

.logo svg {
    width: 2.25rem;
    height: 2.25rem;
    fill: currentColor;
}

.logo-text span {
    color: var(--dark);
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-link {
    font-weight: 500;
    color: var(--dark-slate);
    font-size: 0.95rem;
    position: relative;
    padding: 0.5rem 0;
}

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

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

.nav-link:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0.5rem;
    z-index: 1100;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--dark);
    margin: 5px 0;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    position: relative;
    padding: 8.5rem 0 6rem 0;
    background: radial-gradient(circle at 80% 20%, rgba(15, 98, 254, 0.05) 0%, transparent 50%),
                radial-gradient(circle at 10% 80%, rgba(0, 216, 255, 0.03) 0%, transparent 40%);
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3.5rem;
    align-items: center;
}

.hero-content {
    max-width: 680px;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(15, 98, 254, 0.1);
}

.badge svg {
    width: 1rem;
    height: 1rem;
}

.hero-title {
    font-size: 3.25rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
    color: var(--dark);
    line-height: 1.2;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.75;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.stat-item h3 {
    font-size: 1.75rem;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.stat-item p {
    font-size: 0.875rem;
    color: var(--text-light);
    font-weight: 500;
}

/* Simulator Switch Tabs */
.sim-tabs-header {
    display: flex;
    background-color: var(--bg-sec);
    padding: 0.35rem;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border);
    margin-bottom: 1.25rem;
}

.sim-tab-btn {
    flex: 1;
    border: none;
    background: none;
    padding: 0.6rem 0.5rem;
    font-size: 0.825rem;
    font-weight: 700;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    color: var(--text-light);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
}

.sim-tab-btn.active {
    background-color: var(--primary);
    color: var(--text-white);
    box-shadow: var(--shadow-sm);
}

.sim-tab-btn svg {
    width: 1rem;
    height: 1rem;
    fill: currentColor;
}

/* Simulator Card */
.simulator-controls-card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    width: 100%;
    max-width: 650px;
    border: 1px solid var(--border);
    margin-bottom: 2.5rem;
    text-align: left;
}

.sim-card-grid {
    display: grid;
    grid-template-columns: 1fr 1.25fr;
    gap: 1.5rem;
}

.sim-card-col {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.control-group {
    margin-bottom: 1rem;
}

.control-group:last-child {
    margin-bottom: 0;
}

.control-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--dark-slate);
    margin-bottom: 0.35rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.control-input {
    width: 100%;
    padding: 0.55rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    transition: var(--transition);
}

.control-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.toggle-switch-group {
    display: flex;
    background-color: var(--bg-sec);
    padding: 0.25rem;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border);
}

.toggle-btn {
    flex: 1;
    border: none;
    background: none;
    padding: 0.4rem;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-light);
    transition: var(--transition);
}

.toggle-btn.active {
    background-color: var(--primary);
    color: var(--text-white);
    box-shadow: var(--shadow-sm);
}

/* Phone Mockup Wrapper */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    position: relative;
}

.phone-mockup-wrapper {
    position: relative;
    width: 310px;
    height: 620px;
    z-index: 2;
    flex-shrink: 0;
}

.phone-mockup {
    width: 100%;
    height: 100%;
    border-radius: 40px;
    border: 10px solid var(--dark-slate);
    background-color: #000000;
    box-shadow: var(--shadow-phone);
    position: relative;
    overflow: hidden;
}

/* Phone Notch */
.phone-notch {
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 90px;
    height: 24px;
    background-color: var(--dark-slate);
    border-radius: 12px;
    z-index: 10;
}

/* Phone Screen Contents */
.phone-screen {
    width: 100%;
    height: 100%;
    background-color: #F3F4F6;
    display: flex;
    flex-direction: column;
    position: relative;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.phone-screen-content {
    display: none;
    height: 100%;
    flex-direction: column;
}

.phone-screen-content.active {
    display: flex;
}

/* Phone Status Bar */
.phone-status-bar {
    height: 40px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    padding: 0 20px 8px 20px;
    font-size: 11px;
    font-weight: 600;
    color: #000000;
    background-color: rgba(243, 244, 246, 0.8);
    backdrop-filter: blur(10px);
    z-index: 5;
    flex-shrink: 0;
}

.status-right {
    display: flex;
    gap: 4px;
    align-items: center;
}

/* 1. SMS CSS Mockup */
.phone-app-header {
    background-color: rgba(243, 244, 246, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    padding: 10px 15px 12px 15px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 5;
    flex-shrink: 0;
}

.back-btn {
    font-size: 15px;
    color: var(--primary);
    cursor: pointer;
    display: flex;
    align-items: center;
}

.contact-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-grow: 1;
}

.avatar-container {
    position: relative;
    width: 36px;
    height: 36px;
    margin-bottom: 4px;
}

.avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #E2E8F0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #64748B;
    font-weight: 700;
    font-size: 13px;
    border: 1px solid #CBD5E1;
}

.avatar.brandname-avatar {
    background: linear-gradient(135deg, var(--primary) 0%, #00B1D4 100%);
    color: var(--text-white);
    border: none;
}

.avatar-badge {
    position: absolute;
    bottom: -2px;
    right: -2px;
    background-color: var(--primary);
    color: var(--text-white);
    border-radius: 50%;
    width: 14px;
    height: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid #F3F4F6;
}

.avatar-badge svg {
    width: 8px;
    height: 8px;
    fill: currentColor;
}

.sender-name {
    font-size: 12px;
    font-weight: 700;
    color: #1E293B;
    display: flex;
    align-items: center;
    gap: 3px;
}

.sender-status {
    font-size: 9px;
    color: #64748B;
    font-weight: 400;
}

.info-btn {
    font-size: 16px;
    color: var(--primary);
}

.phone-chat-body {
    flex-grow: 1;
    padding: 15px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    gap: 12px;
    background-color: #E5E7EB;
    background-image: radial-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 0);
    background-size: 12px 12px;
}

.sms-date {
    text-align: center;
    font-size: 10px;
    color: #6B7280;
    font-weight: 600;
    margin: 5px 0;
}

.message-bubble {
    max-width: 85%;
    align-self: flex-start;
    background-color: var(--text-white);
    border-radius: 16px;
    padding: 10px 14px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
    position: relative;
    font-size: 11px;
    line-height: 1.4;
    color: #1F2937;
    animation: bubbleSlideIn 0.4s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

.message-bubble::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: -6px;
    width: 12px;
    height: 12px;
    background-color: var(--text-white);
    clip-path: polygon(100% 0, 100% 100%, 0 100%);
}

.message-brand {
    background-color: var(--primary);
    color: var(--text-white);
    align-self: flex-end;
    border-radius: 16px;
    box-shadow: 0 2px 4px rgba(15, 98, 254, 0.15);
}

.message-brand::before {
    left: auto;
    right: -6px;
    background-color: var(--primary);
    clip-path: polygon(0 0, 0 100%, 100% 100%);
}

.message-brand .sms-time {
    color: rgba(255, 255, 255, 0.7);
}

.sms-time {
    display: block;
    text-align: right;
    font-size: 9px;
    color: #9CA3AF;
    margin-top: 4px;
}

.phone-app-footer {
    padding: 8px 12px 24px 12px;
    background-color: #F3F4F6;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.text-input-mock {
    flex-grow: 1;
    background-color: var(--text-white);
    border: 1px solid #D1D5DB;
    border-radius: 20px;
    padding: 6px 12px;
    font-size: 11px;
    color: #9CA3AF;
}

.send-btn-mock {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--primary);
    color: var(--text-white);
    display: flex;
    align-items: center;
    justify-content: center;
}

.send-btn-mock svg {
    width: 12px;
    height: 12px;
    fill: currentColor;
}

/* 2. Zalo ZNS CSS Mockup */
.zalo-header {
    background-color: var(--zalo-color);
    color: var(--text-white);
    padding: 10px 15px 12px 15px;
    display: flex;
    align-items: center;
    z-index: 5;
    flex-shrink: 0;
}

.zalo-header-title {
    flex-grow: 1;
    font-size: 13px;
    font-weight: 600;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.zalo-chat-body {
    flex-grow: 1;
    padding: 12px;
    background-color: #E9EBED;
    display: flex;
    flex-direction: column;
    gap: 12px;
    overflow-y: auto;
}

.zalo-message-card {
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    padding: 14px;
    border: 1px solid #E4E7EB;
    display: flex;
    flex-direction: column;
    animation: bubbleSlideIn 0.4s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

.zalo-oa-info {
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid #F2F4F7;
    padding-bottom: 8px;
    margin-bottom: 10px;
}

.zalo-oa-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--zalo-color) 0%, #38BDF8 100%);
    color: var(--text-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 11px;
}

.zalo-oa-name {
    font-size: 11px;
    font-weight: 700;
    color: var(--dark-slate);
    display: flex;
    align-items: center;
    gap: 2px;
}

.zalo-card-title {
    font-size: 12px;
    font-weight: 800;
    color: #1E293B;
    margin-bottom: 8px;
    line-height: 1.3;
}

.zalo-card-content {
    font-size: 10.5px;
    color: #475569;
    margin-bottom: 12px;
    line-height: 1.4;
    white-space: pre-line;
}

.zalo-card-meta {
    font-size: 10px;
    color: #94A3B8;
    border-top: 1px solid #F1F5F9;
    padding-top: 8px;
    margin-bottom: 10px;
}

.zalo-action-btn {
    background-color: var(--zalo-light);
    color: var(--zalo-color);
    border: none;
    border-radius: var(--border-radius-sm);
    padding: 8px 10px;
    font-size: 11px;
    font-weight: 700;
    cursor: pointer;
    text-align: center;
    transition: var(--transition);
    display: inline-block;
}

.zalo-action-btn:hover {
    background-color: #D1E5FF;
}

.zalo-footer {
    padding: 10px 12px 24px 12px;
    background-color: #F8FAFC;
    border-top: 1px solid #E2E8F0;
    display: flex;
    justify-content: space-around;
    font-size: 10px;
    color: #64748B;
    font-weight: 500;
    flex-shrink: 0;
}

.zalo-footer-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.zalo-footer-item svg {
    width: 18px;
    height: 18px;
}

/* 3. Voice Brandname Call Mockup */
.phone-call-body {
    flex-grow: 1;
    background-color: #111827;
    background: radial-gradient(circle at center, #1F2937 0%, #030712 100%);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 50px 30px 60px 30px;
    color: var(--text-white);
    align-items: center;
}

.call-header-info {
    text-align: center;
    margin-top: 20px;
}

.call-caller-name {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: -0.01em;
    color: var(--text-white);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.call-status {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    font-weight: 500;
    animation: pulse 1.5s infinite;
}

.call-avatar-container {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    box-shadow: 0 0 0 10px rgba(15, 98, 254, 0.1), 0 0 0 20px rgba(15, 98, 254, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: 800;
    margin: 40px 0;
    animation: floatCall 3s ease-in-out infinite;
}

.call-actions-grid {
    display: flex;
    justify-content: space-between;
    width: 100%;
    gap: 40px;
}

.call-btn-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 10px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.6);
}

.call-btn-circle {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    border: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.call-btn-circle.decline {
    background-color: var(--danger);
    animation: shakeCall 1.2s infinite;
}

.call-btn-circle.accept {
    background-color: var(--success);
}

.call-btn-circle svg {
    width: 22px;
    height: 22px;
    fill: currentColor;
}

/* Call Animations */
@keyframes pulse {
    0% { opacity: 0.5; }
    50% { opacity: 1; }
    100% { opacity: 0.5; }
}

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

@keyframes shakeCall {
    0%, 100% { transform: rotate(0); }
    10%, 30%, 50%, 70%, 90% { transform: rotate(-5deg); }
    20%, 40%, 60%, 80% { transform: rotate(5deg); }
}

/* Decorative background blobs in Hero */
.blob-1 {
    position: absolute;
    width: 300px;
    height: 300px;
    background-color: var(--primary-glow);
    filter: blur(80px);
    border-radius: 50%;
    top: -50px;
    right: -50px;
    z-index: 1;
}

.blob-2 {
    position: absolute;
    width: 250px;
    height: 250px;
    background-color: rgba(0, 216, 255, 0.08);
    filter: blur(85px);
    border-radius: 50%;
    bottom: 100px;
    left: -100px;
    z-index: 1;
}

/* Services section and 7-card Grid */
.services-section-title {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 1rem;
}

.service-card {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 2.25rem 1.75rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    opacity: 0;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

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

.service-card-num {
    position: absolute;
    top: 1.5rem;
    right: 1.75rem;
    font-size: 2.5rem;
    font-weight: 800;
    color: rgba(15, 98, 254, 0.07);
    line-height: 1;
    font-style: italic;
}

.service-card:hover .service-card-num {
    color: rgba(15, 98, 254, 0.15);
}

.service-card-icon {
    width: 3.25rem;
    height: 3.25rem;
    border-radius: var(--border-radius-md);
    background-color: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    transition: var(--transition);
}

.service-card:hover .service-card-icon {
    background-color: var(--primary);
    color: var(--text-white);
    transform: scale(1.05);
}

.service-card-icon svg {
    width: 1.6rem;
    height: 1.6rem;
    fill: currentColor;
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.service-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1.25rem;
    line-height: 1.5;
    flex-grow: 1;
}

.service-features-list {
    list-style: none;
    margin-bottom: 1.5rem;
    border-top: 1px dashed var(--border);
    padding-top: 1.25rem;
}

.service-features-list li {
    font-size: 0.875rem;
    color: var(--text-main);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 0.6rem;
    line-height: 1.4;
}

.service-features-list li:last-child {
    margin-bottom: 0;
}

.service-features-list li svg {
    width: 1rem;
    height: 1rem;
    color: var(--primary);
    flex-shrink: 0;
    margin-top: 2px;
}

.service-card .btn-link {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--primary);
    margin-top: auto;
}

.service-card .btn-link svg {
    width: 0.9rem;
    height: 0.9rem;
    transition: var(--transition);
}

.service-card:hover .btn-link svg {
    transform: translateX(4px);
}

/* Category headers for services */
.service-cat-section {
    margin-bottom: 4rem;
}

.service-cat-section:last-child {
    margin-bottom: 0;
}

.service-cat-header {
    border-left: 4px solid var(--primary);
    padding-left: 1rem;
    margin-bottom: 2rem;
}

.service-cat-header h3 {
    font-size: 1.5rem;
    color: var(--dark-slate);
}

.service-cat-header p {
    font-size: 0.95rem;
    color: var(--text-light);
}

/* Lợi ích doanh nghiệp nhận được */
.benefits-outer {
    background-color: var(--bg-sec);
    padding: 5rem 0;
}

.benefits-box-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1.5rem;
    margin-top: 1rem;
}

.benefit-box-card {
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    padding: 2rem 1.5rem;
    border: 1px solid var(--border);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.benefit-box-icon {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    background-color: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem auto;
    transition: var(--transition);
}

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

.benefit-box-icon svg {
    width: 1.5rem;
    height: 1.5rem;
    fill: currentColor;
}

.benefit-box-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--dark-slate);
}

.benefit-box-card p {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.4;
}

/* Why choose us values banner */
.values-banner {
    background-color: var(--primary);
    color: var(--text-white);
    padding: 3rem 0;
}

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

.value-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.value-icon-circle {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.25rem;
}

.value-icon-circle svg {
    width: 1.25rem;
    height: 1.25rem;
    fill: currentColor;
}

.value-item h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-white);
}

.value-item p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.8);
}

/* Pricing Section & Calculator */
.calc-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3rem;
    align-items: stretch;
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    overflow: hidden;
}

.calc-inputs-panel {
    padding: 3rem;
}

.calc-inputs-title {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.75rem;
}

.calc-group {
    margin-bottom: 2rem;
}

.calc-group:last-child {
    margin-bottom: 0;
}

.calc-label {
    display: block;
    font-weight: 600;
    color: var(--dark-slate);
    margin-bottom: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.calc-label span.value-badge {
    background-color: var(--primary-light);
    color: var(--primary);
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    font-size: 0.85rem;
}

.calc-tabs {
    display: flex;
    gap: 0.75rem;
}

.calc-tab-btn {
    flex: 1;
    border: 1px solid var(--border);
    background-color: var(--white);
    padding: 0.75rem;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    color: var(--text-light);
}

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

.calc-tab-btn.active {
    background-color: var(--primary);
    color: var(--text-white);
    border-color: var(--primary);
    box-shadow: 0 4px 10px var(--primary-glow);
}

.calc-range {
    width: 100%;
    height: 6px;
    background: #E2E8F0;
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.calc-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    box-shadow: 0 0 0 4px var(--primary-light);
    transition: var(--transition);
}

.calc-range::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.network-selector-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.network-checkbox {
    position: relative;
}

.network-checkbox input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.network-tile {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    background-color: var(--bg-sec);
}

.network-tile:hover {
    border-color: var(--primary);
}

.network-logo-placeholder {
    font-weight: 800;
    font-size: 1.1rem;
    margin-bottom: 0.2rem;
    color: var(--dark-slate);
}

.network-viettel { color: #EE0000; }
.network-vina { color: #0070F3; }
.network-mobi { color: #00A2E8; }
.network-vnm { color: #FF6600; }
.network-gmobile { color: #FFCC00; }

.network-tile span.rate {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 0.25rem;
}

.network-checkbox input:checked + .network-tile {
    border-color: var(--primary);
    background-color: var(--primary-light);
}

.network-checkbox input:checked + .network-tile .network-logo-placeholder {
    color: var(--primary);
}

/* Pricing Results Panel */
.calc-results-panel {
    background-color: var(--dark);
    color: var(--text-white);
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}

.calc-results-panel::before {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    background-color: var(--primary-glow);
    filter: blur(80px);
    border-radius: 50%;
    top: -50px;
    right: -50px;
}

.results-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 1.5rem;
    margin-bottom: 2rem;
    position: relative;
    z-index: 2;
}

.results-header h3 {
    color: var(--text-white);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.results-breakdown {
    flex-grow: 1;
    position: relative;
    z-index: 2;
}

.breakdown-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.7);
}

.breakdown-row.total {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    margin-top: 1.5rem;
    color: var(--text-white);
}

.breakdown-row.total span.price {
    font-size: 2rem;
    font-weight: 800;
    color: var(--secondary);
}

.results-footer {
    position: relative;
    z-index: 2;
    margin-top: 2rem;
}

.results-footer p {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 1.5rem;
}

.results-footer .btn {
    width: 100%;
}

/* Consultation & Contact Form */
.contact-layout {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 4rem;
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    overflow: hidden;
}

.contact-info-panel {
    background-color: var(--primary-light);
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.contact-info-header h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.contact-info-header p {
    color: var(--text-light);
}

.contact-info-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 3rem 0;
}

.contact-card {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.contact-card-icon {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background-color: var(--white);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}

.contact-card-icon svg {
    width: 1rem;
    height: 1rem;
    fill: currentColor;
}

.contact-card-details h5 {
    font-size: 0.9rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.contact-card-details p, .contact-card-details a {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark-slate);
}

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

.legal-badge-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-light);
    border-top: 1px solid rgba(15, 98, 254, 0.1);
    padding-top: 1.5rem;
}

.legal-badge-list span strong {
    color: var(--dark-slate);
}

/* Consultation Form Inputs */
.contact-form-panel {
    padding: 3rem;
}

.form-title {
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: span 2;
}

.form-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--dark-slate);
    margin-bottom: 0.5rem;
}

.form-control {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--border-radius-md);
    background-color: var(--bg-sec);
    transition: var(--transition);
    font-size: 0.95rem;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    background-color: var(--white);
    box-shadow: 0 0 0 4px var(--primary-glow);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* Success Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(10, 25, 47, 0.6);
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

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

.modal-card {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 3rem 2rem;
    width: 100%;
    max-width: 460px;
    text-align: center;
    transform: translateY(20px);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.modal-overlay.active .modal-card {
    transform: translateY(0);
}

.modal-icon {
    width: 4rem;
    height: 4rem;
    background-color: var(--success-light);
    color: var(--success);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem auto;
}

.modal-icon svg {
    width: 2rem;
    height: 2rem;
    fill: currentColor;
}

.modal-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.modal-card p {
    color: var(--text-light);
    margin-bottom: 2rem;
    font-size: 0.95rem;
}

/* Footer Styles */
.footer {
    background-color: var(--bg-dark-hero);
    color: rgba(255, 255, 255, 0.7);
    padding: 5rem 0 2rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1.5fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand h4 {
    color: var(--text-white);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-brand h4 svg {
    width: 2rem;
    height: 2rem;
    fill: var(--primary);
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.footer-socials {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-white);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-link:hover {
    background-color: var(--primary);
    transform: translateY(-3px);
}

.social-link svg {
    width: 1rem;
    height: 1rem;
    fill: currentColor;
}

.footer-links h5, .footer-map-col h5 {
    color: var(--text-white);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    position: relative;
}

.footer-links h5::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 30px;
    height: 2px;
    background-color: var(--primary);
}

.footer-links-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links-list a {
    font-size: 0.9rem;
}

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

.footer-map-container {
    width: 100%;
    height: 160px;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    margin-bottom: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-map-container iframe {
    width: 100%;
    height: 100%;
    border: 0;
}

.footer-map-col p {
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-map-col p svg {
    width: 1rem;
    height: 1rem;
    fill: var(--primary);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

.footer-bottom-links {
    display: flex;
    gap: 1.5rem;
}

/* Keyframes Animations */
@keyframes bubbleSlideIn {
    0% {
        opacity: 0;
        transform: translateY(12px) scale(0.97);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Scroll Animation classes via JS Observer */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

.delay-100 { transition-delay: 0.1s; }
.delay-200 { transition-delay: 0.2s; }
.delay-300 { transition-delay: 0.3s; }
.delay-400 { transition-delay: 0.4s; }

/* Responsive Media Queries */
@media (max-width: 1200px) {
    html {
        font-size: 15px;
    }
    
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3.5rem;
        text-align: center;
    }
    
    .hero-content {
        max-width: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .simulator-controls-card {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-stats {
        width: 100%;
    }
    
    .benefits-box-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 1024px) {
    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .calc-container {
        grid-template-columns: 1fr;
    }
    
    .contact-layout {
        grid-template-columns: 1fr;
    }
    
    .contact-info-panel {
        gap: 2rem;
    }
    
    .footer-top {
        grid-template-columns: 1.2fr 0.8fr 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 4rem 0;
    }
    
    .hamburger {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 4.5rem;
        left: -100%;
        width: 100%;
        height: calc(100vh - 4.5rem);
        background-color: var(--white);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2.5rem;
        transition: var(--transition);
        box-shadow: 0 10px 15px -5px rgba(0, 0, 0, 0.05);
        z-index: 999;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .solutions-grid {
        grid-template-columns: 1fr;
    }
    
    .benefits-box-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .values-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .form-group.full-width {
        grid-column: span 1;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .sim-card-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .sim-card-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-buttons .btn {
        width: 100%;
    }
    
    .phone-mockup-wrapper {
        width: 280px;
        height: 560px;
    }
    
    .benefits-box-grid {
        grid-template-columns: 1fr;
    }
    
    .values-grid {
        grid-template-columns: 1fr;
    }
    
    .calc-inputs-panel {
        padding: 1.5rem;
    }
    
    .calc-results-panel {
        padding: 1.5rem;
    }
    
    .contact-form-panel {
        padding: 1.5rem;
    }
    
    .contact-info-panel {
        padding: 1.5rem;
    }
    
    .network-selector-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}