/* ============================================================
   NEXT STEP TECHNOLOGY SOLUTIONS — style.css
   ============================================================ */

:root {
    --primary: #00b4e5;
    --primary-dark: #0099cc;
    --primary-light: #e0f7fa;
    --secondary: #0f172a;
    --text-gray: #475569;
    --border: #e2e8f0;
    --surface: #f8fafc;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', sans-serif;
    color: var(--secondary);
    background: #ffffff;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ==================== HEADER ==================== */
.glass-header {
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: box-shadow 0.3s, padding 0.3s;
}
.glass-header.scrolled {
    box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}
.glass-header.scrolled .header-container {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
}

/* ==================== NAV LINKS ==================== */
.nav-link {
    position: relative;
    transition: color 0.3s ease;
    font-weight: 500;
    color: #334155;
    text-decoration: none;
}
.nav-link:hover { color: var(--primary); }
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0;
    width: 0; height: 2px;
    background: var(--primary);
    transition: width 0.3s ease;
    border-radius: 2px;
}
.nav-link:hover::after { width: 100%; }

/* ==================== DROPDOWN ==================== */
.nav-group { position: relative; }
.nav-dropdown-wrapper {
    position: absolute;
    left: 50%;
    top: 100%;
    width: 240px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(8px);
    transition: all 0.25s ease;
    z-index: 200;
    padding-top: 8px;
}
.nav-group:hover .nav-dropdown-wrapper {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}
.nav-dropdown {
    background: #fff;
    border-radius: 1rem;
    box-shadow: 0 10px 30px rgba(34,211,238,0.15);
    border: 1px solid #f1f5f9;
    overflow: hidden;
}
.nav-dropdown a {
    display: flex;
    align-items: center;
    padding: 14px 20px;
    font-size: 14px;
    color: #475569;
    transition: all 0.2s ease;
    position: relative;
    border-top: 1px solid #f8fafc;
    text-decoration: none;
}
.nav-dropdown a:first-child { border-top: none; }
.nav-dropdown a::before {
    content: '';
    position: absolute;
    left: 0; top: 0;
    height: 100%; width: 3px;
    background: var(--primary);
    transform: scaleY(0);
    transition: transform 0.2s ease;
    transform-origin: center;
}
.nav-dropdown a:hover { background: rgba(0,180,229,0.05); color: var(--primary); }
.nav-dropdown a:hover::before { transform: scaleY(1); }

/* ==================== BUTTONS ==================== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    border-radius: 0.75rem;
    padding: 0.75rem 1.5rem;
    transition: all 0.25s ease;
    border: none;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    text-decoration: none;
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,180,229,0.3);
    color: #fff;
}
.btn-gradient {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    font-weight: 600;
    border-radius: 9999px;
    padding: 0.625rem 1.5rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    text-decoration: none;
}
.btn-gradient:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0,180,229,0.3);
    color: #fff;
}
.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 2px solid var(--border);
    color: var(--text-gray);
    font-weight: 700;
    border-radius: 0.75rem;
    padding: 0.75rem 1.5rem;
    transition: all 0.25s ease;
    background: transparent;
    cursor: pointer;
    text-decoration: none;
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ==================== SECTION UTILITIES ==================== */
.section-label {
    color: var(--primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    display: block;
}
.section-line {
    width: 56px; height: 4px;
    background: var(--primary);
    border-radius: 2px;
    margin-top: 1rem;
}
.section-line.center { margin-left: auto; margin-right: auto; }

/* ==================== HERO ==================== */
.hero-gradient {
    background: radial-gradient(circle at top right, rgba(0,180,229,0.12), transparent),
                radial-gradient(circle at bottom left, rgba(15,23,42,0.02), transparent);
}
.hero-light {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f7fa 60%, #f8fafc 100%);
}
.floating {
    animation: float 6s ease-in-out infinite;
}
@keyframes float {
    0%,100% { transform: translateY(0); }
    50% { transform: translateY(-16px); }
}

/* ==================== CARDS ==================== */
.service-card {
    border: 1px solid #f1f5f9;
    border-radius: 1.5rem;
    background: #fff;
    transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
    overflow: hidden;
}
.service-card:hover {
    border-color: rgba(0,180,229,0.35);
    box-shadow: 0 24px 48px rgba(0,180,229,0.12);
    transform: translateY(-6px);
}
.solution-card {
    border: 1px solid #f1f5f9;
    border-radius: 0.75rem;
    background: #fff;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}
.solution-card:hover {
    border-color: var(--primary);
    box-shadow: 0 12px 24px rgba(0,180,229,0.1);
    transform: translateY(-2px);
}
.icon-box {
    width: 56px; height: 56px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 12px;
    background: rgba(0,180,229,0.1);
    color: var(--primary);
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
    flex-shrink: 0;
}
.service-card:hover .icon-box,
.solution-card:hover .icon-box {
    background: var(--primary);
    color: #fff;
    transform: rotate(6deg);
}
.check-icon { color: var(--primary); flex-shrink: 0; margin-top: 4px; }

/* ==================== TABS (Giải pháp) ==================== */
.tab-btn {
    position: relative;
    padding: 1rem 2rem;
    font-weight: 700;
    color: #94a3b8;
    transition: all 0.3s ease;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    background: none;
    border: none;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
}
.tab-btn.active { color: var(--primary); }
.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 100%; height: 3px;
    background: var(--primary);
    border-radius: 2px 2px 0 0;
}
.tab-btn:hover:not(.active) { color: #475569; }
.tab-content { display: none; animation: fadeInUp 0.45s ease forwards; }
.tab-content.active { display: block; }

/* ==================== CS TABS (use-case) ==================== */
.cs-tab {
    padding: 0.625rem 1.25rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    border: 2px solid var(--border);
    color: #64748b;
    background: #fff;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Inter', sans-serif;
}
.cs-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.cs-tab:hover:not(.active) { border-color: var(--primary); color: var(--primary); }
.cs-panel { display: block; }
.cs-panel.hidden { display: none; }

/* ==================== TIER TABS ==================== */
.tier-tab {
    padding: 10px 22px;
    border-radius: 9999px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    border: 2px solid var(--border);
    color: #64748b;
    background: #fff;
    transition: all 0.25s ease;
    font-family: 'Inter', sans-serif;
}
.tier-tab.active { background: var(--secondary); color: #fff; border-color: var(--secondary); }

/* ==================== SSD TOGGLE ==================== */
.ssd-toggle {
    display: inline-flex;
    background: #f1f5f9;
    border-radius: 9999px;
    padding: 4px;
    gap: 2px;
}
.ssd-toggle button {
    padding: 8px 20px;
    border-radius: 9999px;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    border: none;
    background: transparent;
    color: #64748b;
    transition: all 0.25s ease;
    font-family: 'Inter', sans-serif;
}
.ssd-toggle button.active { background: var(--primary); color: #fff; box-shadow: 0 4px 12px rgba(0,180,229,0.3); }

/* ==================== PKG CARDS ==================== */
.pkg-card {
    background: #fff;
    border: 1.5px solid var(--border);
    border-radius: 1.25rem;
    padding: 1.75rem;
    transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}
.pkg-card:hover { transform: translateY(-6px); border-color: var(--primary); box-shadow: 0 20px 48px rgba(0,180,229,0.12); }

/* ==================== SPEC ROW ==================== */
.spec-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 7px 0;
    border-bottom: 1px solid #f1f5f9;
    font-size: 13px;
}
.spec-row:last-child { border-bottom: none; }

/* ==================== BADGES ==================== */
.badge-std { display:inline-block; background:#e0f2fe; color:#0369a1; font-size:10px; font-weight:800; padding:2px 8px; border-radius:20px; text-transform:uppercase; letter-spacing:0.05em; }
.badge-ent { display:inline-block; background:linear-gradient(135deg,#6366f1,#8b5cf6); color:#fff; font-size:10px; font-weight:800; padding:2px 8px; border-radius:20px; text-transform:uppercase; letter-spacing:0.05em; }

/* ==================== CALCULATOR ==================== */
input[type="range"] { accent-color: var(--primary); height: 6px; cursor: pointer; }
.calc-input {
    width: 72px; padding: 6px 8px; text-align: center;
    border: 1.5px solid var(--border); border-radius: 8px;
    font-family: 'Inter', sans-serif; font-weight: 700; font-size: 14px;
    color: var(--secondary); outline: none; transition: border-color 0.2s;
}
.calc-input:focus { border-color: var(--primary); }

/* ==================== DRAWER ==================== */
.drawer { max-height: 0; overflow: hidden; transition: max-height 0.65s cubic-bezier(0.4,0,0.2,1), opacity 0.4s ease; opacity: 0; }
.drawer.open { max-height: 9999px; opacity: 1; }
.read-more-btn {
    color: var(--primary); font-weight: 800; font-size: 0.8rem;
    letter-spacing: 0.1em; text-transform: uppercase;
    display: inline-flex; align-items: center; gap: 8px;
    transition: gap 0.3s, opacity 0.3s;
    border: none; background: none; cursor: pointer; padding: 0;
    font-family: 'Inter', sans-serif;
}
.read-more-btn:hover { opacity: 0.75; gap: 14px; }

/* ==================== STAT BADGE ==================== */
.stat-badge {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff; border-radius: 1rem; padding: 1.25rem 1.75rem;
    text-align: center; box-shadow: 0 10px 25px rgba(0,180,229,0.2);
}

/* ==================== TABLE ==================== */
.styled-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.styled-table th { background: #f8fafc; color: #475569; font-weight: 700; text-align: left; padding: 12px 16px; border-bottom: 2px solid #e2e8f0; }
.styled-table td { padding: 12px 16px; border-bottom: 1px solid #f1f5f9; color: #64748b; vertical-align: top; }
.styled-table tr:last-child td { border-bottom: none; }
.styled-table tr:hover td { background: #fafcff; }
.tag-cloud { display:inline-block; background:#e0f7fa; color:#00838f; padding:2px 10px; border-radius:20px; font-weight:700; font-size:0.75rem; }
.tag-premise { display:inline-block; background:#f1f5f9; color:#475569; padding:2px 10px; border-radius:20px; font-weight:700; font-size:0.75rem; }

/* ==================== MISC ==================== */
.quote-box { background: rgba(0,180,229,0.05); border-left: 4px solid var(--primary); border-radius: 0 16px 16px 0; }
.benefit-box { background: #f8fafc; border-radius: 16px; padding: 20px; border: 1px solid #f1f5f9; transition: border-color 0.3s; }
.benefit-box:hover { border-color: rgba(0,180,229,0.4); }
.check-list li { display: flex; align-items: flex-start; gap: 12px; padding: 6px 0; }
.check-list .chk { width:20px; height:20px; min-width:20px; border-radius:50%; background:rgba(0,180,229,0.15); color:var(--primary); display:flex; align-items:center; justify-content:center; font-size:0.6rem; margin-top:2px; flex-shrink:0; }

/* ==================== REVEAL ==================== */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ==================== ANIMATIONS ==================== */
@keyframes fadeInUp { from { opacity:0; transform:translateY(16px); } to { opacity:1; transform:translateY(0); } }
@keyframes fadeIn { from { opacity:0; transform:translateY(15px); } to { opacity:1; transform:translateY(0); } }
.fade-in { animation: fadeInUp 0.4s ease forwards; }
@keyframes pulse-dot { 0%,100% { opacity:0.3; } 50% { opacity:1; } }
.animate-dot { animation: pulse-dot 2s infinite ease-in-out; }

/* ==================== PRICING ==================== */
.pricing-row:hover { background: #f0f9ff; }

/* ==================== TOAST ==================== */
#toast {
    position: fixed; bottom: 24px; right: 24px; z-index: 9999;
    background: var(--primary); color: #fff;
    padding: 12px 20px; border-radius: 14px;
    font-size: 14px; font-weight: 600; font-family: 'Inter', sans-serif;
    display: flex; align-items: center; gap: 8px;
    transform: translateY(12px); opacity: 0;
    transition: all 0.3s ease; pointer-events: none;
    box-shadow: 0 8px 32px rgba(0,180,229,0.35);
}
#toast.show { transform: translateY(0); opacity: 1; }

/* ==================== MODALS ==================== */
#quotation-modal { display:none; position:fixed; inset:0; z-index:1000; background:rgba(15,23,42,0.55); backdrop-filter:blur(4px); overflow-y:auto; }
#article-modal { transition: opacity 0.3s ease; }

/* ==================== IMAGE STACK ==================== */
.image-stack { position: relative; height: 450px; }
.image-stack img:first-child { width: 80%; height: 350px; object-fit: cover; border-radius: 24px; }
.image-stack .overlay-img { position:absolute; bottom:0; right:0; width:65%; height:250px; object-fit:cover; border-radius:24px; border:8px solid white; box-shadow:0 20px 40px rgba(0,0,0,0.1); }

/* ==================== FORM ==================== */
.form-input {
    width: 100%; padding: 0.75rem 1rem;
    border: 1.5px solid var(--border); border-radius: 0.75rem;
    font-family: 'Inter', sans-serif; font-size: 14px;
    color: var(--secondary); outline: none;
    transition: border-color 0.2s, box-shadow 0.2s; background: #fff;
}
.form-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(0,180,229,0.15); }

/* ==================== MOBILE MENU ==================== */
#mobile-menu {
    display: none; position: fixed; top:0; left:0; right:0; bottom:0;
    background: rgba(15,23,42,0.97); z-index: 200;
    flex-direction: column; align-items: center; justify-content: center; gap: 2rem;
}
#mobile-menu.open { display: flex; }
#mobile-menu a { color:#fff; font-size:1.25rem; font-weight:700; text-transform:uppercase; letter-spacing:0.05em; transition:color 0.2s; text-decoration:none; }
#mobile-menu a:hover { color: var(--primary); }
#mobile-menu-close { position:absolute; top:1.5rem; right:1.5rem; color:#fff; background:none; border:none; cursor:pointer; }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .image-stack { height: auto; }
    .image-stack img:first-child { width: 100%; height: 260px; }
    .image-stack .overlay-img { display: none; }
    .tab-btn { padding: 0.75rem 0.75rem; font-size: 0.7rem; }
    .pkg-card { padding: 1.25rem; }
}
/*===Fix lỗi không đều gói small===*/
/* ===== FIX: Package cards đồng đều chiều cao ===== */
.pkg-panel .grid {
    align-items: stretch;
}

.pkg-card {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.pkg-card .mb-5.space-y-0\.5 {
    flex: 1;
}