/* ==========================================================================
   ChemXcel Redesign - Global Core Stylesheet
   ========================================================================== */

@import url('variables.css');

/* 1. Resets & Base Configuration */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--trans-medium), color var(--trans-medium);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
    border: 2px solid var(--bg-primary);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

/* Selection */
::selection {
    background-color: var(--primary-glow);
    color: var(--primary-light);
}

/* Typography base */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4.25rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.8rem, 4vw, 2.75rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.4rem, 3vw, 1.875rem); letter-spacing: -0.01em; }
h4 { font-size: 1.25rem; }
p { color: var(--text-secondary); margin-bottom: 1rem; font-weight: 400; }
a { color: var(--primary-light); text-decoration: none; transition: color var(--trans-fast); }
a:hover { color: var(--secondary); }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }

/* 2. Structured Layout Containers */
.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1rem;
}

.section {
    padding: clamp(4rem, 7vw, 7rem) 0;
    position: relative;
}

/* Alternating Mockup Section Utilities */
.section-dark {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}
.section-dark p {
    color: var(--text-secondary);
}

.section-dark-alt {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}
.section-dark-alt p {
    color: var(--text-secondary);
}

.section-light {
    background-color: #ffffff;
    color: hsl(224, 60%, 12%); /* Dark slate for high contrast */
}
.section-light h1, .section-light h2, .section-light h3, .section-light h4 {
    color: hsl(224, 60%, 12%);
}
.section-light p {
    color: hsl(220, 15%, 35%);
}
.section-light .card {
    background-color: #ffffff;
    border-color: hsl(220, 15%, 90%);
}
.section-light .card-description {
    color: hsl(220, 15%, 45%);
}
.section-light .card-title {
    color: hsl(224, 60%, 12%);
}

/* 3. Common Header & Footer Layouts */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: background-color var(--trans-medium), backdrop-filter var(--trans-medium), border-color var(--trans-medium), box-shadow var(--trans-medium);
    border-bottom: 1px solid transparent;
}

.main-header.scrolled {
    background-color: var(--glass-bg);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    height: 70px;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

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

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.logo-txt {
    background: var(--grad-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2.25rem;
}

.nav-link {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-secondary);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--grad-primary);
    transition: width var(--trans-medium);
    border-radius: var(--radius-round);
}

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Burger Button for Mobile Navigation */
.burger-menu {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    cursor: pointer;
    z-index: 1010;
}

.burger-line {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    transition: transform var(--trans-medium), opacity var(--trans-medium);
    border-radius: var(--radius-round);
}

/* Premium Footer */
.main-footer {
    background-color: hsl(194, 64%, 4%);
    color: hsl(174, 15%, 70%);
    padding: 5rem 0 2rem 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-top: 1rem;
    max-width: 320px;
}

.footer-title {
    color: hsl(0, 0%, 100%);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    position: relative;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-link {
    color: var(--text-secondary);
    transition: color var(--trans-fast), transform var(--trans-fast);
    display: inline-block;
}

.footer-link:hover {
    color: hsl(0, 0%, 100%);
    transform: translateX(4px);
}

.footer-contact-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    color: var(--text-secondary);
}

.footer-contact-item svg {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    stroke: var(--secondary-light);
    margin-top: 3px;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-sm);
    background-color: rgba(255, 255, 255, 0.05);
    color: hsl(0, 0%, 100%);
    transition: background-color var(--trans-fast), transform var(--trans-fast), color var(--trans-fast);
}

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

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-bottom-links {
    display: flex;
    gap: 2rem;
}

/* 4. Common UI Utility Classes */
.text-gradient-purple {
    background: linear-gradient(135deg, var(--primary) 30%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-round);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.85rem;
    background-color: var(--primary-glow);
    color: var(--primary-light);
    border: 1px solid rgba(0, 191, 165, 0.15);
}

.badge-alt {
    background-color: var(--secondary-glow);
    color: var(--secondary-light);
    border: 1px solid rgba(0, 229, 255, 0.15);
}

.section-title-wrapper {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 4rem auto;
}

.section-title-wrapper.left {
    text-align: left;
    margin-left: 0;
}

.section-title {
    margin-bottom: 1rem;
    line-height: 1.15;
}

.section-subtitle {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: var(--text-secondary);
}

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; }

.d-flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 5. Entrance Micro-Animations Setup (Scroll Reveal) */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--trans-slow), transform var(--trans-slow);
}

.reveal.reveal-left {
    transform: translateX(-50px);
}

.reveal.reveal-right {
    transform: translateX(50px);
}

.reveal.reveal-scale {
    transform: scale(0.9);
}

.reveal.active {
    opacity: 1;
    transform: translate(0) scale(1);
}

.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }
.delay-500 { transition-delay: 500ms; }

/* Responsive adjustments */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 3rem;
    }
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }
    .burger-menu {
        display: flex;
    }
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 360px;
        height: 100vh;
        background-color: var(--bg-secondary);
        flex-direction: column;
        justify-content: center;
        gap: 2rem;
        z-index: 1005;
        box-shadow: -10px 0 30px rgba(0,0,0,0.3);
        transition: right var(--trans-medium);
        padding: 2rem;
    }
    .nav-menu.active {
        right: 0;
    }
    /* Hamburger morph into Close X state */
    .burger-menu.active .burger-line:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .burger-menu.active .burger-line:nth-child(2) {
        opacity: 0;
    }
    .burger-menu.active .burger-line:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
    .footer-bottom-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .grid-4 {
        grid-template-columns: 1fr;
    }
    .footer-bottom-links {
        flex-direction: column;
        gap: 0.75rem;
    }
}

/* ============================================================
   UNIFIED FOOTER STYLES (MATCHES HOMEPAGE)
   ============================================================ */
.footer { background:#040D1A; padding:4rem 0 1.5rem; color:rgba(255,255,255,0.5); font-size:.87rem; }
.foot-grid { display:grid; grid-template-columns:1.8fr 1fr 1fr 1.4fr; gap:3.5rem; margin-bottom:3rem; }
.foot-desc { font-size:.81rem; line-height:1.7; max-width:275px; margin-top:.75rem; color:rgba(255,255,255,0.5); }
.social-row { display:flex; gap:10px; margin-top:1.25rem; }
.soc-btn {
    width:34px; height:34px; border-radius:var(--radius-sm); background:rgba(255,255,255,.05);
    border:1px solid rgba(255,255,255,.08); display:flex; align-items:center; justify-content:center;
    color:rgba(255,255,255,.6); transition:background var(--trans-fast),color var(--trans-fast),transform var(--trans-fast);
}
.soc-btn:hover { background:var(--primary); color:#fff; transform:translateY(-2px); border-color:var(--primary); }
.foot-h { font-family:var(--font-heading); font-size:.88rem; font-weight:700; color:#fff; margin-bottom:1.2rem; }
.foot-links { display:flex; flex-direction:column; gap:8px; }
.foot-link  { font-size:.8rem; color:rgba(255,255,255,.46); transition:color var(--trans-fast),transform var(--trans-fast); display:inline-block; }
.foot-link:hover { color:var(--primary); transform:translateX(3px); }
.foot-contacts { display:flex; flex-direction:column; gap:10px; }
.foot-ci { display:flex; align-items:flex-start; gap:9px; font-size:.8rem; color:rgba(255,255,255,.46); }
.foot-ci svg { color:var(--primary); flex-shrink:0; margin-top:2px; }
hr.foot-div { border:none; border-top:1px solid rgba(255,255,255,.07); margin-bottom:1.5rem; }
.foot-btm { display:flex; align-items:center; justify-content:space-between; font-size:.74rem; color:rgba(255,255,255,.28); flex-wrap:wrap; gap:.5rem; }
.foot-btm a { color:rgba(255,255,255,.32); transition:color var(--trans-fast); }
.foot-btm a:hover { color:var(--primary); }

@media (max-width: 1024px) {
    .foot-grid { grid-template-columns: repeat(2, 1fr); gap: 2.5rem; }
}
@media (max-width: 768px) {
    .foot-grid { grid-template-columns: 1fr; }
    .foot-btm { flex-direction: column; gap: 1rem; text-align: center; }
}