/* ==========================================================================
   CSS CẤU HÌNH GIAO DIỆN NỀN TẢNG ĐA DỊCH VỤ - CHUẨN SEO & RESPONSIVE
   ========================================================================== */

:root {
    --primary-color: #059669;    /* Xanh lục công nghệ chủ đạo */
    --secondary-color: #F59E0B;  /* Cam nhấn mạnh CTA */
    --dark-color: #1F2937;       /* Màu chữ tiêu đề */
    --text-color: #4B5563;       /* Màu chữ nội dung */
    --light-bg: #F9FAFB;         /* Màu nền khối phụ */
    --white: #FFFFFF;
    --transition-smooth: all 0.3s ease-in-out;
    --font-main: 'Inter', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
    overflow-x: hidden;
}

/* Typography chuẩn SEO */
h1, h2, h3, h4, h5, h6 {
    color: var(--dark-color);
    font-weight: 700;
    margin-bottom: 1rem;
}

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

a:hover {
    color: var(--secondary-color);
}

/* Hiệu ứng Header cố định */
.sticky-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1050;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: var(--transition-smooth);
}

/* Khối Hero Banner */
.hero-section {
    padding: 160px 0 100px 0;
    background: linear-gradient(135deg, #EEF2F6 0%, #E0E7FF 100%);
    position: relative;
}

.hero-title {
    font-size: 2.8rem;
    line-height: 1.2;
    background: linear-gradient(to right, var(--dark-color), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Card Dịch vụ */
.service-card {
    background: var(--white);
    border: none;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    transition: var(--transition-smooth);
    height: 100%;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px rgba(5, 150, 105, 0.1);
}

.service-icon {
    width: 60px;
    height: 60px;
    background: rgba(5, 150, 105, 0.1);
    color: var(--primary-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

/* Nút bấm đồng bộ */
.btn-custom-primary {
    background-color: var(--primary-color);
    color: var(--white) !important;
    font-weight: 600;
    padding: 12px 28px;
    border-radius: 8px;
    border: none;
    transition: var(--transition-smooth);
}

.btn-custom-primary:hover {
    background-color: #047857;
    transform: translateY(-2px);
}

.btn-custom-secondary {
    background-color: var(--secondary-color);
    color: var(--white) !important;
    font-weight: 600;
    padding: 12px 28px;
    border-radius: 8px;
    border: none;
    transition: var(--transition-smooth);
}

/* Hiệu ứng chuyển động JS Trigger Animation class */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* Footer Section */
.footer-section {
    background-color: #111827;
    color: #9CA3AF;
    padding: 80px 0 30px 0;
}

.footer-section h5 {
    color: var(--white);
    margin-bottom: 1.5rem;
}

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

.footer-links a {
    color: #9CA3AF;
}

.footer-links a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}