/* =========================================================
   SGTECH.CSS — Design System & Global Styles
   SG Tech Product Website
   ========================================================= */

/* -------------------------
   CSS Custom Properties
   ------------------------- */
:root {
    /* Brand Colors */
    --sg-primary:      #2563EB;
    --sg-primary-dark: #1d4ed8;
    --sg-primary-light:#dbeafe;
    --sg-secondary:    #10B981;
    --sg-secondary-dark:#059669;

    /* Neutrals */
    --sg-bg:       #F8FAFC;
    --sg-white:    #ffffff;
    --sg-text:     #1E293B;
    --sg-text-muted:#64748B;
    --sg-border:   #e2e8f0;

    /* Grays */
    --sg-gray-50:  #f8fafc;
    --sg-gray-100: #f1f5f9;
    --sg-gray-200: #e2e8f0;
    --sg-gray-300: #cbd5e1;
    --sg-gray-400: #94a3b8;
    --sg-gray-500: #64748b;
    --sg-gray-600: #475569;
    --sg-gray-700: #334155;
    --sg-gray-800: #1e293b;
    --sg-gray-900: #0f172a;

    /* Typography */
    --font-display: 'Plus Jakarta Sans', sans-serif;
    --font-body:    'Inter', sans-serif;

    /* Spacing */
    --section-py:  100px;
    --section-py-sm: 60px;

    /* Shadows */
    --shadow-sm:   0 1px 3px rgba(0,0,0,.08);
    --shadow-md:   0 4px 16px rgba(0,0,0,.10);
    --shadow-lg:   0 12px 40px rgba(0,0,0,.12);
    --shadow-xl:   0 20px 60px rgba(0,0,0,.14);
    --shadow-primary: 0 8px 30px rgba(37, 99, 235, 0.25);

    /* Border Radius */
    --radius-sm:   8px;
    --radius-md:   12px;
    --radius-lg:   16px;
    --radius-xl:   24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--sg-text);
    background-color: var(--sg-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Override Bootstrap defaults for our design */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--sg-gray-900);
    line-height: 1.25;
}

a {
    color: var(--sg-primary);
    text-decoration: none;
    transition: var(--transition);
}
a:hover { color: var(--sg-primary-dark); text-decoration: none; }

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

/* -------------------------
   Logo Mark
   ------------------------- */
.logo-sg {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.4em;
    color: var(--sg-primary);
    letter-spacing: -0.5px;
}
.logo-tech {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.4em;
    color: var(--sg-secondary);
    letter-spacing: -0.5px;
}

/* -------------------------
   Buttons — Global
   ------------------------- */
.btn {
    font-family: var(--font-body);
    font-weight: 600;
    border-radius: var(--radius-full);
    border: none;
    transition: var(--transition);
    letter-spacing: 0.01em;
}

.btn-primary-sg {
    background: var(--sg-primary);
    color: #fff;
    padding: 14px 32px;
    box-shadow: var(--shadow-primary);
}
.btn-primary-sg:hover {
    background: var(--sg-primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(37,99,235,.35);
}

.btn-outline-sg {
    background: transparent;
    color: var(--sg-primary);
    border: 2px solid var(--sg-primary);
    padding: 12px 30px;
}
.btn-outline-sg:hover {
    background: var(--sg-primary);
    color: #fff;
    transform: translateY(-2px);
}

.btn-secondary-sg {
    background: var(--sg-secondary);
    color: #fff;
    padding: 14px 32px;
    box-shadow: 0 8px 25px rgba(16,185,129,.25);
}
.btn-secondary-sg:hover {
    background: var(--sg-secondary-dark);
    color: #fff;
    transform: translateY(-2px);
}

.btn-white-sg {
    background: #fff;
    color: var(--sg-primary);
    padding: 14px 32px;
    box-shadow: var(--shadow-md);
}
.btn-white-sg:hover {
    background: var(--sg-gray-50);
    color: var(--sg-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* -------------------------
   Section Utilities
   ------------------------- */
.section {
    padding: var(--section-py) 0;
}
.section-sm {
    padding: var(--section-py-sm) 0;
}
.section-bg {
    background: var(--sg-white);
}
.section-dark {
    background: var(--sg-gray-900);
    color: #fff;
}
.section-gradient {
    background: linear-gradient(135deg, var(--sg-primary) 0%, #1d4ed8 50%, #4f46e5 100%);
    color: #fff;
}

/* Section label (eyebrow text) */
.section-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: .8rem;
    font-weight: 700;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--sg-primary);
    background: var(--sg-primary-light);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}
.section-label.green {
    color: var(--sg-secondary);
    background: #d1fae5;
}

/* Section heading */
.section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.8rem);
    font-weight: 800;
    color: var(--sg-gray-900);
    margin-bottom: 16px;
    line-height: 1.2;
}
.section-title span.highlight {
    color: var(--sg-primary);
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--sg-text-muted);
    max-width: 580px;
    margin: 0 auto;
    line-height: 1.7;
}

/* -------------------------
   Cards
   ------------------------- */
.sg-card {
    background: var(--sg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--sg-gray-200);
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.sg-card:hover {
    border-color: var(--sg-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.sg-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--sg-primary), var(--sg-secondary));
    opacity: 0;
    transition: var(--transition);
}
.sg-card:hover::before { opacity: 1; }

/* -------------------------
   Badge / Tags
   ------------------------- */
.sg-badge {
    display: inline-block;
    font-size: .75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    background: var(--sg-primary-light);
    color: var(--sg-primary);
}
.sg-badge-success {
    background: #d1fae5;
    color: var(--sg-secondary-dark);
}

/* -------------------------
   Loading Screen
   ------------------------- */
#loading-screen {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: var(--sg-gray-900);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}
#loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}
#loading-screen .loading-logo .logo-sg,
#loading-screen .loading-logo .logo-tech {
    font-size: 2.2rem;
}
.loading-bar {
    width: 200px;
    height: 3px;
    background: rgba(255,255,255,.1);
    border-radius: var(--radius-full);
    overflow: hidden;
}
.loading-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--sg-primary), var(--sg-secondary));
    border-radius: var(--radius-full);
    animation: loadFill 1.2s ease forwards;
}
@keyframes loadFill {
    to { width: 100%; }
}

/* -------------------------
   Back to Top
   ------------------------- */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: var(--sg-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-primary);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
    z-index: 999;
}
#back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
#back-to-top:hover {
    background: var(--sg-primary-dark);
    transform: translateY(-3px);
}

/* -------------------------
   Utility Classes
   ------------------------- */
.text-primary-sg  { color: var(--sg-primary) !important; }
.text-secondary-sg { color: var(--sg-secondary) !important; }
.bg-primary-sg    { background: var(--sg-primary) !important; }
.bg-secondary-sg  { background: var(--sg-secondary) !important; }
.fw-800           { font-weight: 800; }
.fw-700           { font-weight: 700; }
.fw-600           { font-weight: 600; }
.rounded-xl       { border-radius: var(--radius-xl) !important; }
.shadow-lg-sg     { box-shadow: var(--shadow-lg); }

/* -------------------------
   Responsive
   ------------------------- */
@media (max-width: 768px) {
    :root {
        --section-py: 60px;
        --section-py-sm: 40px;
    }
    .section-title {
        font-size: 1.7rem;
    }
}