/* ============================================================
    CODE4US — Main Stylesheet
   Dark Premium Theme
   ============================================================ */

/* ----------------------------------------------------------
   Custom Properties
   ---------------------------------------------------------- */
:root {
    /* Colours */
    --color-bg:            #0a0e1a;
    --color-bg-alt:        #0f1525;
    --color-bg-card:       rgba(255, 255, 255, 0.03);
    --color-bg-card-hover: rgba(255, 255, 255, 0.06);
    --color-surface:       #131927;
    --color-surface-border: rgba(255, 255, 255, 0.06);

    --color-text:          #e2e8f0;
    --color-text-muted:    #94a3b8;
    --color-text-dim:      #64748b;

    --color-accent:        #6366f1;
    --color-accent-light:  #818cf8;
    --color-accent-glow:   rgba(99, 102, 241, 0.25);
    --color-accent2:       #06b6d4;
    --color-accent2-glow:  rgba(6, 182, 212, 0.2);
    --color-accent3:       #8b5cf6;

    --color-success:       #22c55e;
    --color-danger:        #ef4444;

    /* Typography */
    --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono:  'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

    --fs-xs:   0.75rem;
    --fs-sm:   0.875rem;
    --fs-base: 1rem;
    --fs-md:   1.125rem;
    --fs-lg:   1.25rem;
    --fs-xl:   1.5rem;
    --fs-2xl:  1.875rem;
    --fs-3xl:  2.25rem;
    --fs-4xl:  2.75rem;
    --fs-hero: 3.5rem;

    /* 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;

    /* Radii */
    --radius-sm:   6px;
    --radius-md:   10px;
    --radius-lg:   16px;
    --radius-xl:   24px;

    /* Shadows */
    --shadow-sm:  0 1px 2px rgba(0,0,0,0.3);
    --shadow-md:  0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg:  0 8px 32px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 40px var(--color-accent-glow);

    /* Transitions */
    --ease-out:  cubic-bezier(0.22, 1, 0.36, 1);
    --duration:  0.3s;

    /* Layout */
    --max-width: 1200px;
    --header-h:  72px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    scroll-padding-top: var(--header-h);
}

body {
    font-family: var(--font-sans);
    font-size: var(--fs-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

a {
    color: var(--color-accent-light);
    text-decoration: none;
    transition: color var(--duration) var(--ease-out);
}

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

ul, ol {
    list-style: none;
}

button {
    font: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

input, textarea, select {
    font: inherit;
    color: inherit;
}

::selection {
    background: var(--color-accent);
    color: #fff;
}

/* Focus ring */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-accent);
    color: #fff;
    font-weight: 600;
    border-radius: var(--radius-sm);
    z-index: 10000;
    transition: top 0.2s;
}

.skip-link:focus {
    top: var(--space-md);
}

/* ----------------------------------------------------------
   Container
   ---------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ----------------------------------------------------------
   Buttons
   ---------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 14px 32px;
    font-size: var(--fs-sm);
    font-weight: 600;
    letter-spacing: 0.02em;
    border-radius: var(--radius-md);
    transition: all var(--duration) var(--ease-out);
    white-space: nowrap;
    cursor: pointer;
    text-decoration: none;
    min-height: 48px;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 2px 12px var(--color-accent-glow);
}

.btn-primary:hover {
    background: var(--color-accent-light);
    box-shadow: 0 4px 20px var(--color-accent-glow);
    transform: translateY(-1px);
    color: #fff;
}

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

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-surface-border);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent-light);
    background: rgba(99, 102, 241, 0.05);
}

.btn-small {
    padding: 10px 24px;
    font-size: var(--fs-xs);
    min-height: 40px;
}

/* Nav button variant */
.btn-nav {
    padding: 10px 24px;
    font-size: var(--fs-xs);
    min-height: 40px;
}

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

.section-alt {
    background: var(--color-bg-alt);
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto var(--space-4xl);
}

.section-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent-light);
    margin-bottom: var(--space-md);
    position: relative;
    padding: 0 var(--space-md);
}

.section-label::before,
.section-label::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 24px;
    height: 1px;
    background: var(--color-accent);
    opacity: 0.5;
}

.section-label::before {
    left: calc(100% + var(--space-md));
}

.section-label::after {
    right: calc(100% + var(--space-md));
}

.section-title {
    font-size: clamp(var(--fs-2xl), 4vw, var(--fs-3xl));
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
    color: #fff;
}

.section-subtitle {
    font-size: var(--fs-md);
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ----------------------------------------------------------
   Animations
   ---------------------------------------------------------- */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }

    html {
        scroll-behavior: auto;
    }
}

/* ----------------------------------------------------------
   Header / Navigation
   ---------------------------------------------------------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-h);
    background: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-surface-border);
    transition: background var(--duration) var(--ease-out);
}

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

/* Logo */
.logo {
    display: flex;
    align-items: baseline;
    gap: 0;
    font-size: var(--fs-lg);
    font-weight: 800;
    letter-spacing: -0.01em;
    text-decoration: none;
    color: #fff;
    transition: opacity var(--duration) var(--ease-out);
}

.logo:hover {
    opacity: 0.9;
    color: #fff;
}

.logo-word {
    display: inline-block;
}

.logo-accent {
    color: var(--color-accent-light);
}

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

.nav-list a {
    font-size: var(--fs-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--duration) var(--ease-out);
    position: relative;
}

.nav-list a:hover,
.nav-list a.active {
    color: #fff;
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    border-radius: 1px;
    transition: width var(--duration) var(--ease-out);
}

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

/* Mobile Nav Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    z-index: 1001;
}

.nav-toggle-line {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
    transition: all var(--duration) var(--ease-out);
    transform-origin: center;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
    transform: rotate(45deg) translate(4px, 5px);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -5px);
}

/* ----------------------------------------------------------
   Hero
   ---------------------------------------------------------- */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--header-h);
}

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

.hero-bg::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
    opacity: 0.5;
}

.hero-bg::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -5%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--color-accent2-glow) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 25s ease-in-out infinite reverse;
    opacity: 0.4;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -20px) scale(1.05); }
    66% { transform: translate(-20px, 15px) scale(0.95); }
}

/* Grid pattern overlay */
.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 780px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 6px 16px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-surface-border);
    border-radius: 100px;
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.hero-badge-dot {
    width: 6px;
    height: 6px;
    background: var(--color-success);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero-title {
    font-size: clamp(var(--fs-3xl), 6vw, var(--fs-hero));
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -0.03em;
    color: #fff;
    margin-bottom: var(--space-xl);
}

.hero-title .gradient-text {
    background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text {
    font-size: var(--fs-md);
    color: var(--color-text-muted);
    line-height: 1.7;
    max-width: 580px;
    margin-bottom: var(--space-2xl);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-3xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-dim);
    font-size: var(--fs-xs);
    animation: scroll-bounce 2s ease-in-out infinite;
}

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

@keyframes scroll-bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

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

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

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent2));
    opacity: 0;
    transition: opacity var(--duration) var(--ease-out);
}

.service-card:hover {
    background: var(--color-bg-card-hover);
    border-color: rgba(99, 102, 241, 0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-accent-glow), var(--color-accent2-glow));
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    font-size: var(--fs-xl);
}

.service-title {
    font-size: var(--fs-lg);
    font-weight: 700;
    color: #fff;
    margin-bottom: var(--space-sm);
}

.service-desc {
    font-size: var(--fs-sm);
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.service-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm) var(--space-lg);
}

.service-list li {
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    padding-left: 16px;
    position: relative;
    line-height: 1.5;
}

.service-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.45em;
    width: 5px;
    height: 5px;
    background: var(--color-accent);
    border-radius: 50%;
    opacity: 0.7;
}

.service-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--fs-sm);
    font-weight: 600;
    color: var(--color-accent-light);
    margin-top: var(--space-lg);
    text-decoration: none;
}

.service-cta:hover {
    gap: var(--space-md);
}

.service-cta-arrow {
    display: inline-block;
    transition: transform var(--duration) var(--ease-out);
}

.service-cta:hover .service-cta-arrow {
    transform: translateX(3px);
}

/* ----------------------------------------------------------
   Why Us / Advantages
   ---------------------------------------------------------- */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.advantage-item {
    text-align: center;
    padding: var(--space-xl);
}

.advantage-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--space-md);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-surface-border);
    font-size: var(--fs-lg);
}

.advantage-title {
    font-size: var(--fs-base);
    font-weight: 600;
    color: #fff;
    margin-bottom: var(--space-sm);
}

.advantage-desc {
    font-size: var(--fs-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
}

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

.portfolio-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-surface-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--duration) var(--ease-out);
}

.portfolio-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99, 102, 241, 0.15);
}

.portfolio-image {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: var(--color-surface);
}

.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s var(--ease-out);
}

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

.portfolio-image-placeholder {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
}

.portfolio-image-placeholder[style] {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--color-surface), var(--color-bg-card));
}

.portfolio-tag {
    position: absolute;
    top: var(--space-md);
    left: var(--space-md);
    padding: 4px 12px;
    background: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(8px);
    border-radius: 100px;
    font-size: var(--fs-xs);
    font-weight: 500;
    color: var(--color-accent-light);
    border: 1px solid var(--color-surface-border);
}

.portfolio-body {
    padding: var(--space-lg);
}

.portfolio-title {
    font-size: var(--fs-base);
    font-weight: 700;
    color: #fff;
    margin-bottom: var(--space-sm);
}

.portfolio-desc {
    font-size: var(--fs-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.portfolio-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.portfolio-tech span {
    padding: 3px 10px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-surface-border);
    border-radius: 100px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--color-text-dim);
}

.portfolio-link {
    font-size: var(--fs-sm);
    font-weight: 600;
    color: var(--color-accent-light);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
}

.portfolio-link:hover {
    color: var(--color-accent);
}

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

.about-content h3 {
    font-size: var(--fs-xl);
    font-weight: 700;
    color: #fff;
    margin-bottom: var(--space-md);
}

.about-content p {
    font-size: var(--fs-sm);
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.about-values {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.about-value {
    display: flex;
    gap: var(--space-sm);
    align-items: flex-start;
}

.about-value-icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border-radius: var(--radius-sm);
    font-size: var(--fs-md);
}

.about-value-text {
    font-size: var(--fs-sm);
    color: var(--color-text-muted);
    line-height: 1.5;
}

.about-value-text strong {
    display: block;
    color: #fff;
    font-weight: 600;
    margin-bottom: 2px;
}

/* Code block decoration */
.about-visual {
    background: var(--color-surface);
    border: 1px solid var(--color-surface-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    font-family: var(--font-mono);
    font-size: var(--fs-xs);
    line-height: 1.8;
    overflow: hidden;
}

.code-line {
    display: block;
}

.code-keyword { color: var(--color-accent-light); }
.code-string  { color: var(--color-success); }
.code-func    { color: var(--color-accent2); }
.code-comment { color: var(--color-text-dim); font-style: italic; }
.code-var     { color: #f59e0b; }
.code-bracket { color: var(--color-text-muted); }

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

.contact-info h3 {
    font-size: var(--fs-xl);
    font-weight: 700;
    color: #fff;
    margin-bottom: var(--space-md);
}

.contact-info p {
    font-size: var(--fs-sm);
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: var(--space-xl);
}

.contact-detail {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.contact-detail-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-surface-border);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    font-size: var(--fs-md);
}

.contact-detail-text {
    font-size: var(--fs-sm);
    color: var(--color-text-muted);
}

.contact-detail-text strong {
    display: block;
    color: #fff;
    font-weight: 500;
    margin-bottom: 2px;
}

/* Form */
.contact-form {
    background: var(--color-bg-card);
    border: 1px solid var(--color-surface-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
}

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

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    font-size: var(--fs-xs);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.form-group label .optional {
    font-weight: 400;
    color: var(--color-text-dim);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--color-bg);
    border: 1px solid var(--color-surface-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: var(--fs-sm);
    transition: border-color var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--color-text-dim);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

.form-select option {
    background: var(--color-surface);
    color: var(--color-text);
}

.form-textarea {
    min-height: 140px;
    resize: vertical;
}

/* Honeypot — hidden from users */
.form-honeypot {
    position: absolute;
    left: -9999px;
    opacity: 0;
    pointer-events: none;
}

/* CAPTCHA */
.captcha-row {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.captcha-input {
    flex: 0 0 120px;
}

.captcha-challenge {
    flex: 1;
    font-family: var(--font-mono);
    font-size: var(--fs-base);
    color: var(--color-text);
    background: var(--color-bg-card);
    border: 1px solid var(--color-surface-border);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    letter-spacing: 0.05em;
    user-select: none;
    min-height: 44px;
    display: flex;
    align-items: center;
}

.captcha-refresh {
    flex: 0 0 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    font-size: var(--fs-lg);
    color: var(--color-text-muted);
    background: var(--color-bg-card);
    border: 1px solid var(--color-surface-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.captcha-refresh:hover:not(:disabled),
.captcha-refresh:focus-visible:not(:disabled) {
    color: var(--color-accent-light);
    border-color: var(--color-accent);
    background: var(--color-bg-card-hover);
}

.captcha-refresh:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Checkbox */
.form-checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.form-checkbox {
    width: 18px;
    height: 18px;
    margin-top: 2px;
    accent-color: var(--color-accent);
    cursor: pointer;
    flex-shrink: 0;
}

.form-checkbox-label {
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    line-height: 1.5;
}

.form-checkbox-label a {
    color: var(--color-accent-light);
    text-decoration: underline;
}

/* Submit */
.form-submit {
    width: 100%;
}

.form-submit.is-loading {
    pointer-events: none;
    opacity: 0.7;
}

/* Flash messages */
.flash {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    font-size: var(--fs-sm);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.flash-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: var(--color-success);
}

.flash-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--color-danger);
}

.form-error-text {
    color: var(--color-danger);
    font-size: var(--fs-xs);
    margin-top: 4px;
    display: none;
}

.form-group.has-error .form-input,
.form-group.has-error .form-select,
.form-group.has-error .form-textarea {
    border-color: var(--color-danger);
}

.form-group.has-error .form-error-text {
    display: block;
}

/* ----------------------------------------------------------
   Footer
   ---------------------------------------------------------- */
.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-surface-border);
    padding: var(--space-4xl) 0 var(--space-lg);
}

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

.footer-brand {
    max-width: 280px;
}

.footer-tagline {
    font-size: var(--fs-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-md);
    line-height: 1.6;
}

.footer-nav h4,
.footer-contact h4 {
    font-size: var(--fs-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-dim);
    margin-bottom: var(--space-md);
}

.footer-nav ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-nav a,
.footer-contact a {
    font-size: var(--fs-sm);
    color: var(--color-text-muted);
    text-decoration: none;
}

.footer-nav a:hover,
.footer-contact a:hover {
    color: var(--color-accent-light);
}

.footer-address {
    margin-top: var(--space-md);
    font-size: var(--fs-sm);
    color: var(--color-text-dim);
    line-height: 1.7;
}

.footer-bottom {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-surface-border);
    text-align: center;
    font-size: var(--fs-xs);
    color: var(--color-text-dim);
}

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

    .about-grid,
    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --fs-hero: 2.5rem;
        --fs-3xl:  1.75rem;
        --fs-4xl:  2rem;
        --space-5xl: 5rem;
    }

    /* Mobile Nav */
    .nav-toggle {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: min(320px, 85vw);
        background: var(--color-surface);
        border-left: 1px solid var(--color-surface-border);
        padding: calc(var(--header-h) + var(--space-xl)) var(--space-xl) var(--space-xl);
        transform: translateX(100%);
        transition: transform var(--duration) var(--ease-out);
        z-index: 1000;
        overflow-y: auto;
    }

    .main-nav.open {
        transform: translateX(0);
    }

    .nav-list {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-sm);
    }

    .nav-list a {
        padding: var(--space-sm) 0;
        font-size: var(--fs-base);
    }

    .nav-list .btn-nav {
        margin-top: var(--space-md);
        text-align: center;
    }

    /* Overlay behind mobile nav */
    .nav-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.5);
        z-index: 999;
        opacity: 0;
        pointer-events: none;
        transition: opacity var(--duration) var(--ease-out);
    }

    .nav-overlay.active {
        opacity: 1;
        pointer-events: auto;
    }

    /* Grids */
    .services-grid,
    .portfolio-grid,
    .advantages-grid {
        grid-template-columns: 1fr;
    }

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

    .service-list {
        grid-template-columns: 1fr;
    }

    .about-values {
        grid-template-columns: 1fr;
    }

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

    .footer-brand {
        max-width: 100%;
    }

    /* Hero */
    .hero-actions {
        flex-direction: column;
    }

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

    .hero-scroll {
        display: none;
    }

    /* Contact form */
    .contact-form {
        padding: var(--space-lg);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }

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

    :root {
        --fs-hero: 2rem;
        --fs-3xl:  1.5rem;
    }

    .service-card {
        padding: var(--space-lg);
    }
}

/* Print */
@media print {
    .site-header, .site-footer, .hero-scroll, .hero-actions, .btn {
        display: none !important;
    }

    body {
        color: #000;
        background: #fff;
    }
}