/* GDP Limited - Custom Design System & Premium Styling */

/* Variables */
:root {
    --bg-color: #060709;
    --card-bg: rgba(15, 17, 23, 0.7);
    --card-border: rgba(255, 255, 255, 0.05);
    --accent-color: #c5a059;
    --accent-color-glow: rgba(197, 160, 89, 0.3);
    --text-primary: #f8f9fa;
    --text-secondary: #a0a5b5;
    --font-heading: 'Syne', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    --font-mono: 'Space Grotesk', sans-serif;
    --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --header-height: 80px;
}

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

html {
    scroll-behavior: smooth;
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    overflow-x: hidden;
}

body {
    position: relative;
    min-height: 100vh;
    line-height: 1.6;
}

/* Interactive Canvas Background */
#physics-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: all;
    background: radial-gradient(circle at 50% 50%, #0d0f14 0%, #060709 100%);
}

/* Scrollbar Customization */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
    background: #1c1e24;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

/* Typography Utilities */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

p {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

/* Shared Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-decoration: none;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-primary {
    background-color: var(--accent-color);
    color: #060709;
    border: 1px solid var(--accent-color);
}

.btn-primary:hover {
    background-color: transparent;
    color: var(--text-primary);
    box-shadow: 0 0 25px var(--accent-color-glow);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.03);
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

/* Header */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(6, 7, 9, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--card-border);
    z-index: 100;
    transition: var(--transition-smooth);
}

.main-header.scrolled {
    height: 70px;
    background: rgba(6, 7, 9, 0.9);
}

.header-container {
    max-width: 1300px;
    height: 100%;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.4rem;
    letter-spacing: 0.1em;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo span {
    color: var(--accent-color);
    font-weight: 400;
    margin-left: 4px;
}

.nav-menu {
    display: flex;
    gap: 35px;
}

.nav-link {
    font-family: var(--font-mono);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    position: relative;
    padding: 8px 0;
    transition: var(--transition-smooth);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--accent-color);
    transition: var(--transition-smooth);
}

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

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

.cta-button-nav {
    display: inline-block;
    padding: 10px 20px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
    border-radius: 4px;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.cta-button-nav:hover {
    background-color: var(--accent-color);
    color: #060709;
    box-shadow: 0 0 15px var(--accent-color-glow);
}

/* Mobile Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 101;
}

.mobile-menu-toggle .bar {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-smooth);
}

/* Hero Section */
.hero-section {
    position: relative;
    min-height: 100vh;
    padding-top: var(--header-height);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 120px 20px 60px 20px;
}

.hero-content {
    max-width: 800px;
    z-index: 10;
}

.hero-tagline {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    letter-spacing: 0.25em;
    color: var(--accent-color);
    margin-bottom: 20px;
    font-weight: 500;
}

.hero-title {
    font-size: 5rem;
    font-weight: 900;
    margin-bottom: 25px;
    letter-spacing: -0.03em;
    text-shadow: 0 10px 30px rgba(0,0,0,0.5);
    background: linear-gradient(180deg, #ffffff 0%, #a5a9b5 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    font-size: 1.25rem;
    line-height: 1.7;
    margin-bottom: 40px;
    color: var(--text-secondary);
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    opacity: 0.6;
    transition: var(--transition-smooth);
    z-index: 10;
}

.scroll-indicator:hover {
    opacity: 1;
}

.scroll-indicator .mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--text-secondary);
    border-radius: 12px;
    position: relative;
}

.scroll-indicator .wheel {
    width: 4px;
    height: 8px;
    background-color: var(--accent-color);
    border-radius: 2px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll-wheel 1.6s infinite ease-in-out;
}

.scroll-indicator .label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
}

@keyframes scroll-wheel {
    0% { transform: translate(-50%, 0); opacity: 0; }
    30% { opacity: 1; }
    100% { transform: translate(-50%, 15px); opacity: 0; }
}

/* Sections Base Styling */
section {
    padding: 120px 0;
    position: relative;
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-subtitle {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    color: var(--accent-color);
    text-transform: uppercase;
}

.section-title {
    font-size: 2.8rem;
    margin-top: 10px;
    margin-bottom: 20px;
}

.section-divider {
    width: 60px;
    height: 1px;
    background-color: var(--accent-color);
    margin: 0 auto;
}

/* Services Tabs Section */
.services-tabs-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 60px;
    align-items: start;
}

.tabs-nav {
    display: flex;
    flex-direction: column;
    gap: 15px;
    border-left: 1px solid rgba(255,255,255,0.05);
    padding-left: 0;
}

.tab-btn {
    background: transparent;
    border: none;
    text-align: left;
    padding: 15px 25px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 5px;
    border-left: 2px solid transparent;
    margin-left: -1px;
    transition: var(--transition-smooth);
}

.tab-btn .tab-num {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 0.5;
    transition: var(--transition-smooth);
}

.tab-btn .tab-name {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-secondary);
    transition: var(--transition-smooth);
}

.tab-btn.active {
    border-left-color: var(--accent-color);
}

.tab-btn.active .tab-name {
    color: var(--text-primary);
}

.tab-btn.active .tab-num {
    color: var(--accent-color);
    opacity: 1;
}

.tab-btn:hover:not(.active) {
    border-left-color: rgba(197, 160, 89, 0.4);
}

.tab-btn:hover:not(.active) .tab-name {
    color: var(--text-primary);
}

/* Tab Panel Styles */
.tabs-content {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 50px;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    min-height: 480px;
    position: relative;
    overflow: hidden;
}

.tab-panel {
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.tab-panel.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.panel-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    align-items: center;
}

.panel-title {
    font-size: 2rem;
    margin-bottom: 20px;
}

.panel-desc {
    font-size: 1.05rem;
    margin-bottom: 30px;
    line-height: 1.7;
}

.panel-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 40px;
}

.panel-features li {
    display: flex;
    align-items: center;
    gap: 15px;
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.95rem;
}

.panel-features li i {
    color: var(--accent-color);
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

.panel-cta {
    align-self: flex-start;
}

.panel-media {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 4/3;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0,0,0,0.4);
    border: 1px solid rgba(255,255,255,0.05);
}

.service-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.image-wrapper:hover .service-img {
    transform: scale(1.05);
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(6,7,9,0.4) 0%, transparent 100%);
    pointer-events: none;
}

/* Philosophy / About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text .section-title {
    text-align: left;
}

.about-desc {
    margin-bottom: 25px;
    font-size: 1.1rem;
    line-height: 1.7;
}

.stats-panel {
    display: grid;
    grid-template-rows: repeat(3, auto);
    gap: 30px;
}

.stat-card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 6px;
    padding: 30px;
    text-align: center;
    transition: var(--transition-smooth);
}

.stat-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.stat-num {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent-color);
    line-height: 1;
    margin-bottom: 10px;
}

.stat-label {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 80px;
    align-items: start;
}

.contact-info .section-title {
    text-align: left;
}

.contact-desc {
    margin-bottom: 40px;
    font-size: 1.1rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 20px;
}

.detail-item .icon {
    width: 50px;
    height: 50px;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    font-size: 1.2rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.15);
}

.detail-item .text {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text-primary);
}

/* Contact Form */
.contact-form-container {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 50px;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.form-group input, 
.form-group textarea,
.form-group select {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 4px;
    padding: 14px 18px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: var(--transition-smooth);
}

.form-group input::placeholder, 
.form-group textarea::placeholder {
    color: rgba(255,255,255,0.25);
}

.form-group input:focus, 
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    background: rgba(255,255,255,0.05);
    box-shadow: 0 0 10px rgba(197, 160, 89, 0.1);
}

/* Dropdown styling */
.select-wrapper {
    position: relative;
}

.form-group select {
    width: 100%;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
}

.select-wrapper::after {
    content: '\f107';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
    transition: var(--transition-smooth);
}

.form-group select:focus + .select-wrapper::after {
    color: var(--accent-color);
}

.submit-btn {
    align-self: flex-start;
    gap: 12px;
    margin-top: 10px;
}

.submit-btn i {
    transition: var(--transition-smooth);
}

.submit-btn:hover i {
    transform: translate(3px, -3px);
}

.form-response {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin-top: 10px;
    text-align: center;
    border-radius: 4px;
    transition: var(--transition-smooth);
}

.form-response.success {
    color: #4ade80;
    padding: 10px;
    background-color: rgba(74, 222, 128, 0.1);
    border: 1px solid rgba(74, 222, 128, 0.2);
}

.form-response.error {
    color: #f87171;
    padding: 10px;
    background-color: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.2);
}

/* Footer */
.main-footer {
    border-top: 1px solid var(--card-border);
    background-color: #040507;
    padding: 60px 0;
    z-index: 10;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.footer-brand {
    max-width: 400px;
}

.footer-brand .logo {
    margin-bottom: 15px;
}

.footer-brand p {
    font-size: 0.9rem;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(255,255,255,0.03);
    padding-top: 30px;
}

.footer-bottom p {
    font-size: 0.85rem;
}

.footer-legal {
    display: flex;
    gap: 25px;
}

.footer-legal a {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-smooth);
}

.footer-legal a:hover {
    color: var(--accent-color);
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 4rem;
    }
    
    .services-tabs-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .tabs-nav {
        flex-direction: row;
        border-left: none;
        border-bottom: 1px solid rgba(255,255,255,0.05);
        padding-left: 0;
        padding-bottom: 0;
        overflow-x: auto;
        white-space: nowrap;
        margin-left: 0;
    }
    
    .tab-btn {
        border-left: none;
        border-bottom: 2px solid transparent;
        margin-bottom: -1px;
        padding: 10px 20px;
    }
    
    .tab-btn.active {
        border-left-color: transparent;
        border-bottom-color: var(--accent-color);
    }
    
    .tab-btn:hover:not(.active) {
        border-left-color: transparent;
        border-bottom-color: rgba(197, 160, 89, 0.4);
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }
    
    .stats-panel {
        grid-template-columns: repeat(3, 1fr);
        grid-template-rows: auto;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }
    
    .header-container {
        padding: 0 20px;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--bg-color);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 30px;
        transform: translateY(-100%);
        opacity: 0;
        transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.5s ease;
        z-index: 99;
    }
    
    .nav-menu.open {
        transform: translateY(0);
        opacity: 1;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .mobile-menu-toggle.open .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    
    .mobile-menu-toggle.open .bar:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-toggle.open .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }
    
    .cta-button-nav {
        display: none;
    }
    
    .hero-title {
        font-size: 2.8rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 15px;
        width: 100%;
        max-width: 320px;
        margin: 0 auto;
    }
    
    .btn {
        width: 100%;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .tabs-content {
        padding: 30px 20px;
    }
    
    .panel-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .panel-media {
        order: -1;
    }
    
    .stats-panel {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .contact-form-container {
        padding: 30px 20px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}