/* ============================================
   KHENOVA — Professional Tech Business Website
   Color Theme: White + Light Green
   Modern 2026 Design System
   ============================================ */

/* ========== CSS CUSTOM PROPERTIES ========== */
:root {
    /* Colors — Light Theme */
    --color-bg: #ffffff;
    --color-bg-alt: #f8faf8;
    --color-bg-card: #ffffff;
    --color-surface: #f1f8f1;
    --color-border: #e2ece2;
    --color-text: #1a2e1a;
    --color-text-secondary: #4a6a4a;
    --color-text-muted: #7a9a7a;
    --color-heading: #0f1f0f;
    --color-accent: #4caf50;
    --color-accent-light: #81c784;
    --color-accent-lighter: #c8e6c9;
    --color-accent-dark: #2e7d32;
    --color-accent-glow: rgba(76, 175, 80, 0.15);
    --color-gradient-start: #4caf50;
    --color-gradient-end: #81c784;
    --color-overlay: rgba(15, 31, 15, 0.7);
    --color-shadow: rgba(0, 0, 0, 0.06);
    --color-shadow-lg: rgba(0, 0, 0, 0.1);
    --color-header-bg: rgba(255, 255, 255, 0.85);
    --color-form-bg: #ffffff;
    --color-form-border: #d4e8d4;
    --color-form-focus: #4caf50;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', var(--font-primary);
    --font-mono: 'SF Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --space-5xl: 8rem;

    /* Borders */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Layout */
    --header-height: 72px;
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

/* ========== DARK THEME ========== */
[data-theme="dark"] {
    --color-bg: #0a0f0a;
    --color-bg-alt: #111a11;
    --color-bg-card: #151f15;
    --color-surface: #1a2a1a;
    --color-border: #253025;
    --color-text: #d4e8d4;
    --color-text-secondary: #a0c0a0;
    --color-text-muted: #6a8a6a;
    --color-heading: #e8f5e8;
    --color-accent: #66bb6a;
    --color-accent-light: #81c784;
    --color-accent-lighter: #2e4a2e;
    --color-accent-dark: #a5d6a7;
    --color-accent-glow: rgba(102, 187, 106, 0.1);
    --color-overlay: rgba(5, 10, 5, 0.85);
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-lg: rgba(0, 0, 0, 0.4);
    --color-header-bg: rgba(10, 15, 10, 0.9);
    --color-form-bg: #151f15;
    --color-form-border: #304030;
    --color-form-focus: #66bb6a;
}

/* ========== RESET & BASE ========== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition-slow), color var(--transition-slow);
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

button,
input,
select,
textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    outline: none;
    border: none;
    background: none;
}

button {
    cursor: pointer;
}

/* ========== UTILITY CLASSES ========== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--space-5xl) 0;
    position: relative;
}

.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: var(--space-md);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-heading);
    margin-bottom: var(--space-lg);
}

.section-desc {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    line-height: 1.8;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-4xl);
}

.section-header .section-desc {
    margin: 0 auto;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========== BUTTONS ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    color: #fff;
    box-shadow: 0 4px 20px var(--color-accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(76, 175, 80, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-outline {
    border: 2px solid var(--color-border);
    color: var(--color-heading);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-accent-glow);
}

.btn-lg {
    padding: 1rem 2.25rem;
    font-size: 1rem;
}

.btn-full {
    width: 100%;
}

.btn-arrow {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-fast);
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* ========== PRELOADER ========== */
.preloader {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.preloader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.preloader-inner {
    text-align: center;
}

.preloader-logo {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-heading);
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: var(--space-lg);
}

.preloader-bar {
    width: 200px;
    height: 3px;
    background: var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.preloader-bar-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--color-gradient-start), var(--color-gradient-end));
    border-radius: var(--radius-full);
    animation: preloaderFill 1.5s ease-out forwards;
}

@keyframes preloaderFill {
    to { width: 100%; }
}

/* ========== HEADER ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    display: flex;
    align-items: center;
    background: var(--color-header-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-base), background-color var(--transition-slow);
}

.header.scrolled {
    border-bottom-color: var(--color-border);
}

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

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    z-index: 1001;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    color: #fff;
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.1rem;
    border-radius: var(--radius-sm);
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-heading);
}

/* Navigation */
.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    position: relative;
    padding: var(--space-xs) 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

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

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

/* Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.header-cta {
    font-size: 0.85rem;
    padding: 0.6rem 1.25rem;
}

/* Theme Toggle */
.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: var(--color-surface);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--color-accent-lighter);
    transform: rotate(15deg);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

[data-theme="dark"] .icon-sun {
    display: none;
}

[data-theme="light"] .icon-moon,
:root:not([data-theme]) .icon-moon {
    display: none;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    gap: 5px;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-heading);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu Overlay */
.mobile-menu {
    position: fixed;
    inset: 0;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-overlay);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-inner {
    text-align: center;
}

.mobile-nav-list {
    margin-bottom: var(--space-2xl);
}

.mobile-nav-list li {
    margin-bottom: var(--space-lg);
}

.mobile-nav-link {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    color: #fff;
    transition: color var(--transition-fast);
}

.mobile-nav-link:hover {
    color: var(--color-accent-light);
}

/* ========== HERO SECTION ========== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: calc(var(--header-height) + var(--space-3xl)) 0 var(--space-4xl);
    overflow: hidden;
}

.hero-bg-image {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-bg-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.08;
    filter: blur(1px);
}

[data-theme="dark"] .hero-bg-image img {
    opacity: 0.12;
}

.hero-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.3;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    z-index: 1;
}

.hero-glow {
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 1;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-surface);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    margin-bottom: var(--space-2xl);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    color: var(--color-heading);
    margin-bottom: var(--space-xl);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.15rem);
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto var(--space-2xl);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-4xl);
    flex-wrap: wrap;
}

/* Hero Stats */
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2xl);
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-heading);
}

.stat-plus,
.stat-percent {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border);
}

/* Scroll Indicator */
.hero-scroll-indicator {
    position: absolute;
    bottom: var(--space-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    animation: float 3s ease-in-out infinite;
}

.hero-scroll-indicator span {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-text-muted);
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
}

@keyframes float {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

/* ========== ABOUT SECTION ========== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    align-items: center;
}

.about-text {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.8;
}

.about-highlights {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    margin-top: var(--space-2xl);
}

.highlight {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
}

.highlight-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    border-radius: var(--radius-md);
    color: var(--color-accent);
}

.highlight-icon svg {
    width: 22px;
    height: 22px;
}

.highlight strong {
    display: block;
    color: var(--color-heading);
    font-weight: 600;
    margin-bottom: 2px;
}

.highlight span {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* About Visual */
.about-visual {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    gap: var(--space-xl);
}

.about-team-image {
    width: 100%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 12px 40px var(--color-shadow-lg);
    border: 2px solid var(--color-border);
}

.about-team-image img {
    width: 100%;
    height: 260px;
    object-fit: cover;
    display: block;
    transition: transform var(--transition-slow);
}

.about-team-image:hover img {
    transform: scale(1.03);
}

.about-card-stack {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    width: 100%;
}

.about-card {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.about-card:hover {
    border-color: var(--color-accent-light);
    box-shadow: 0 8px 30px var(--color-shadow);
    transform: translateX(8px);
}

.card-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    border-radius: var(--radius-md);
    color: var(--color-accent);
}

.card-icon svg {
    width: 24px;
    height: 24px;
}

.about-card span {
    font-weight: 600;
    color: var(--color-heading);
}

.about-years {
    position: absolute;
    top: -20px;
    right: 0;
    text-align: center;
    padding: var(--space-lg);
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    border-radius: var(--radius-lg);
    color: #fff;
}

.years-number {
    display: block;
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
}

.years-text {
    font-size: 0.8rem;
    opacity: 0.9;
    line-height: 1.3;
}

/* ========== SERVICES SECTION ========== */
.services {
    background: var(--color-bg-alt);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.service-card {
    padding: var(--space-2xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-gradient-start), var(--color-gradient-end));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--color-shadow-lg);
    border-color: var(--color-accent-lighter);
}

.service-icon-wrap {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    margin-bottom: var(--space-lg);
    transition: all var(--transition-base);
}

.service-card:hover .service-icon-wrap {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    color: #fff;
    transform: scale(1.05);
}

.service-icon-wrap svg {
    width: 28px;
    height: 28px;
}

.service-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: var(--space-md);
}

.service-desc {
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.service-tags li {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.3rem 0.75rem;
    background: var(--color-surface);
    color: var(--color-text-muted);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.service-card:hover .service-tags li {
    background: var(--color-accent-glow);
    color: var(--color-accent-dark);
}

/* ========== PORTFOLIO SECTION ========== */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.portfolio-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
}

.portfolio-card-lg {
    grid-column: span 2;
}

.portfolio-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/10;
}

.portfolio-card-lg .portfolio-image {
    aspect-ratio: 2/1;
}

.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform var(--transition-slow);
}

.portfolio-card:hover .portfolio-image img {
    transform: scale(1.05);
}

.portfolio-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-slow);
}

.portfolio-card:hover .portfolio-placeholder {
    transform: scale(1.05);
}

.portfolio-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--space-xl);
    background: linear-gradient(to top, rgba(0, 0, 0, 0.85) 0%, rgba(0, 0, 0, 0.2) 50%, transparent 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.portfolio-card:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-category {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent-light);
    margin-bottom: var(--space-sm);
}

.portfolio-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: var(--space-sm);
}

.portfolio-desc {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.5;
    margin-bottom: var(--space-md);
}

.portfolio-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.portfolio-tech span {
    font-size: 0.7rem;
    font-weight: 500;
    padding: 0.2rem 0.6rem;
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border-radius: var(--radius-full);
    backdrop-filter: blur(10px);
}

/* ========== PROCESS SECTION ========== */
.process {
    background: var(--color-bg-alt);
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
    position: relative;
}

.process-grid::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 12.5%;
    right: 12.5%;
    height: 2px;
    background: var(--color-border);
    z-index: 0;
}

.process-step {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--color-accent);
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-lg);
    transition: all var(--transition-base);
}

.process-step:hover .step-number {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    color: #fff;
    border-color: transparent;
    transform: scale(1.1);
}

.step-title {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: var(--space-md);
}

.step-desc {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ========== TESTIMONIALS SECTION ========== */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.testimonial-card {
    padding: var(--space-2xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--color-shadow-lg);
    border-color: var(--color-accent-lighter);
}

.testimonial-rating {
    display: flex;
    gap: 2px;
    margin-bottom: var(--space-lg);
}

.testimonial-text {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    font-style: italic;
    flex: 1;
    margin-bottom: var(--space-xl);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.author-avatar {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    color: #fff;
    font-weight: 700;
    font-size: 0.85rem;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.testimonial-author strong {
    display: block;
    font-size: 0.9rem;
    color: var(--color-heading);
}

.testimonial-author span {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ========== CONTACT SECTION ========== */
.contact {
    background: var(--color-bg-alt);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-4xl);
    align-items: start;
}

.contact-desc {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-2xl);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    margin-bottom: var(--space-2xl);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
}

.contact-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    border-radius: var(--radius-md);
    color: var(--color-accent);
}

.contact-icon svg {
    width: 20px;
    height: 20px;
}

.contact-item strong {
    display: block;
    font-size: 0.9rem;
    color: var(--color-heading);
    margin-bottom: 2px;
}

.contact-item span {
    font-size: 0.88rem;
    color: var(--color-text-muted);
}

/* Social Links */
.contact-socials {
    display: flex;
    gap: var(--space-md);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    transition: all var(--transition-base);
}

.social-link:hover {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    border-color: transparent;
    color: #fff;
    transform: translateY(-3px);
}

/* Contact Form */
.contact-form-wrap {
    background: var(--color-form-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    box-shadow: 0 8px 40px var(--color-shadow);
    position: relative;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.form-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-heading);
}

.form-input-wrap {
    position: relative;
}

.form-input-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--color-text-muted);
    pointer-events: none;
    transition: color var(--transition-fast);
}

.form-input {
    width: 100%;
    padding: 0.85rem 1rem 0.85rem 2.75rem;
    background: var(--color-surface);
    border: 1.5px solid var(--color-form-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-input:focus {
    border-color: var(--color-form-focus);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-input:focus + .form-input-icon,
.form-input:focus ~ .form-input-icon {
    color: var(--color-accent);
}

/* Fix: icon color on focus for preceding sibling */
.form-input-wrap:focus-within .form-input-icon {
    color: var(--color-accent);
}

select.form-input {
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
}

textarea.form-textarea {
    resize: vertical;
    min-height: 120px;
    padding-left: 1rem;
}

.form-error {
    font-size: 0.78rem;
    color: #e53935;
    min-height: 1rem;
    transition: opacity var(--transition-fast);
}

/* Budget Chips */
.budget-options {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.budget-chip {
    cursor: pointer;
}

.budget-chip input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.budget-chip span {
    display: inline-block;
    padding: 0.5rem 1rem;
    font-size: 0.82rem;
    font-weight: 500;
    background: var(--color-surface);
    border: 1.5px solid var(--color-form-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.budget-chip input:checked + span {
    background: var(--color-accent-glow);
    border-color: var(--color-accent);
    color: var(--color-accent-dark);
}

.budget-chip:hover span {
    border-color: var(--color-accent-light);
}

/* Submit Button States */
#submitBtn {
    position: relative;
    margin-top: var(--space-sm);
}

.btn-loading {
    display: none;
    align-items: center;
    gap: var(--space-sm);
}

.btn-loading .spinner {
    width: 18px;
    height: 18px;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

#submitBtn.loading .btn-text,
#submitBtn.loading .btn-arrow {
    display: none;
}

#submitBtn.loading .btn-loading {
    display: inline-flex;
}

/* Form Success */
.form-success {
    display: none;
    text-align: center;
    padding: var(--space-3xl) var(--space-xl);
}

.form-success.show {
    display: block;
    animation: fadeInUp 0.5s ease;
}

.form-success.hidden-form .contact-form {
    display: none;
}

.success-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-lg);
    color: var(--color-accent);
    animation: scaleIn 0.5s ease;
}

.success-icon svg {
    width: 64px;
    height: 64px;
}

.form-success h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: var(--space-md);
}

.form-success p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

/* ========== FOOTER ========== */
.footer {
    padding: var(--space-4xl) 0 var(--space-xl);
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: var(--space-3xl);
    margin-bottom: var(--space-3xl);
}

.footer-tagline {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-top: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.footer-socials {
    display: flex;
    gap: var(--space-sm);
}

.footer-socials a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: var(--color-surface);
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

.footer-socials a:hover {
    background: var(--color-accent);
    color: #fff;
}

.footer-links h4 {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: var(--space-lg);
}

.footer-links li {
    margin-bottom: var(--space-sm);
}

.footer-links li a,
.footer-links li {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

/* ========== BACK TO TOP ========== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent);
    color: #fff;
    border-radius: var(--radius-full);
    box-shadow: 0 4px 20px rgba(76, 175, 80, 0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-base);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(76, 175, 80, 0.4);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

/* ========== ANIMATIONS ========== */
.animate-fade-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.15s; }
.delay-2 { animation-delay: 0.3s; }
.delay-3 { animation-delay: 0.45s; }
.delay-4 { animation-delay: 0.6s; }

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from { transform: scale(0); }
    to { transform: scale(1); }
}

/* Scroll Reveal */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ========== RESPONSIVE DESIGN ========== */

/* Tablet: 1024px and below */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .portfolio-card-lg {
        grid-column: span 2;
    }

    .process-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-2xl);
    }

    .process-grid::before {
        display: none;
    }

    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .testimonials-grid .testimonial-card:last-child {
        grid-column: span 2;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-2xl);
    }

    .footer-brand {
        grid-column: span 2;
    }
}

/* Mobile: 768px and below */
@media (max-width: 768px) {
    :root {
        --container-padding: 1.25rem;
        --header-height: 64px;
    }

    .section {
        padding: var(--space-4xl) 0;
    }

    /* Header */
    .nav {
        display: none;
    }

    .header-cta {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    /* Hero */
    .hero-title {
        font-size: clamp(2rem, 8vw, 3rem);
    }

    .hero-stats {
        gap: var(--space-lg);
    }

    .stat-divider {
        display: none;
    }

    .hero-scroll-indicator {
        display: none;
    }

    /* About */
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

    .about-visual {
        min-height: auto;
        order: -1;
    }

    .about-years {
        top: -10px;
        right: 10px;
        padding: var(--space-md);
    }

    .years-number {
        font-size: 2rem;
    }

    /* Services */
    .services-grid {
        grid-template-columns: 1fr;
    }

    /* Portfolio */
    .portfolio-grid {
        grid-template-columns: 1fr;
    }

    .portfolio-card-lg {
        grid-column: span 1;
    }

    .portfolio-overlay {
        opacity: 1;
    }

    /* Process */
    .process-grid {
        grid-template-columns: 1fr;
    }

    /* Testimonials */
    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    .testimonials-grid .testimonial-card:last-child {
        grid-column: span 1;
    }

    /* Contact */
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .budget-options {
        flex-direction: column;
    }

    .budget-chip span {
        width: 100%;
        text-align: center;
    }

    .contact-form-wrap {
        padding: var(--space-xl);
    }

    /* Footer */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .footer-brand {
        grid-column: span 1;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
}

/* Small Mobile: 480px and below */
@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--space-lg);
    }

    .stat-number {
        font-size: 1.5rem;
    }

    .about-card-stack {
        gap: var(--space-md);
    }
}