/* =========================================================
   DIRTECH — Main Stylesheet
   Stack: Vanilla CSS / Mobile First / Corporate Modern
   ========================================================= */

/* ---------------------------------------------------------
   1. Google Fonts Import
   --------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ---------------------------------------------------------
   2. CSS Custom Properties (Design Tokens)
   --------------------------------------------------------- */
:root {
    /* Colors */
    --color-primary:        #2563EB;   /* Electric Blue */
    --color-primary-dark:   #1D4ED8;
    --color-primary-light:  #3B82F6;
    --color-accent:         #06B6D4;   /* Cyan accent */
    --color-navy:           #0A1628;   /* Deep navy */
    --color-navy-light:     #0F2040;
    --color-bg:             #F8FAFC;   /* Off white */
    --color-bg-alt:         #EFF6FF;   /* Very light blue */
    --color-surface:        #FFFFFF;
    --color-text:           #1E293B;
    --color-text-muted:     #64748B;
    --color-border:         #E2E8F0;

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

    /* 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;

    /* Border radius */
    --radius-sm:   6px;
    --radius-md:   12px;
    --radius-lg:   20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm:   0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md:   0 4px 16px rgba(37,99,235,0.10), 0 2px 6px rgba(0,0,0,0.06);
    --shadow-lg:   0 20px 40px rgba(37,99,235,0.14), 0 8px 16px rgba(0,0,0,0.08);
    --shadow-glow: 0 0 40px rgba(37,99,235,0.25);

    /* Transitions */
    --transition-fast:   150ms ease;
    --transition-base:   250ms ease;
    --transition-slow:   400ms ease;

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

/* ---------------------------------------------------------
   3. Reset & Base
   --------------------------------------------------------- */
*, *::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-sans);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul, ol { list-style: none; }

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

input, textarea, select {
    font-family: inherit;
}

/* ---------------------------------------------------------
   4. Utility Classes
   --------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--space-lg);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ---------------------------------------------------------
   5. Header / Navigation
   --------------------------------------------------------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    transition: box-shadow var(--transition-base),
                background var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
    background: rgba(255, 255, 255, 0.98);
}

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

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    flex-shrink: 0;
}

.logo__icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(37,99,235,0.35);
}

.logo__icon svg {
    width: 22px;
    height: 22px;
    fill: #fff;
}

.logo__text {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-navy);
}

.logo__text span {
    color: var(--color-primary);
}

/* Desktop Nav */
.nav {
    display: none;
    align-items: center;
    gap: var(--space-xl);
}

.nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav__link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
    position: relative;
    padding-bottom: 2px;
}

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

.nav__link:hover,
.nav__link:focus-visible {
    color: var(--color-primary);
}

.nav__link:hover::after { width: 100%; }

.nav__cta {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff !important;
    padding: 0.55rem 1.25rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast);
    box-shadow: 0 4px 12px rgba(37,99,235,0.35);
}

.nav__cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(37,99,235,0.45);
}

.nav__cta::after { display: none; }

/* Hamburger */
.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
    width: 44px;
    height: 44px;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

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

.hamburger__line {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-navy);
    border-radius: var(--radius-full);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.hamburger.open .hamburger__line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.hamburger.open .hamburger__line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.hamburger.open .hamburger__line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    z-index: 999;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-slow),
                opacity var(--transition-slow),
                visibility var(--transition-slow);
    box-shadow: var(--shadow-lg);
}

.mobile-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.mobile-menu__link {
    padding: 0.75rem var(--space-md);
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.mobile-menu__link:hover { background: var(--color-bg-alt); color: var(--color-primary); }

.mobile-menu__cta {
    margin-top: var(--space-sm);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    padding: 0.85rem var(--space-md);
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    box-shadow: 0 4px 12px rgba(37,99,235,0.35);
}

/* ---------------------------------------------------------
   6. Hero Section
   --------------------------------------------------------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    background: linear-gradient(160deg, var(--color-navy) 0%, var(--color-navy-light) 50%, #0D2757 100%);
    overflow: hidden;
}

/* Animated background grid */
.hero__grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(37,99,235,0.07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37,99,235,0.07) 1px, transparent 1px);
    background-size: 60px 60px;
    animation: gridPan 30s linear infinite;
}

@keyframes gridPan {
    0%   { transform: translateY(0); }
    100% { transform: translateY(60px); }
}

/* Glow orbs */
.hero__orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: orbFloat 8s ease-in-out infinite;
}

.hero__orb--1 {
    width: 400px;
    height: 400px;
    background: var(--color-primary);
    top: -100px;
    right: -80px;
    animation-delay: 0s;
}

.hero__orb--2 {
    width: 300px;
    height: 300px;
    background: var(--color-accent);
    bottom: 0;
    left: -60px;
    animation-delay: -4s;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50%       { transform: translate(20px, -20px) scale(1.05); }
}

.hero__content {
    position: relative;
    z-index: 1;
    padding-block: var(--space-4xl);
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: rgba(37,99,235,0.18);
    border: 1px solid rgba(37,99,235,0.35);
    color: #93C5FD;
    padding: 0.4rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: var(--space-xl);
    width: fit-content;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%       { opacity: 0.5; transform: scale(0.8); }
}

.hero__title {
    font-size: clamp(2rem, 6vw, 3.75rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: #F8FAFC;
    margin-bottom: var(--space-lg);
    max-width: 720px;
}

.hero__title .highlight {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: #94A3B8;
    max-width: 560px;
    margin-bottom: var(--space-2xl);
    font-weight: 400;
    line-height: 1.7;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    align-items: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.9rem 1.75rem;
    border-radius: var(--radius-full);
    font-size: 0.95rem;
    font-weight: 600;
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast),
                background var(--transition-fast);
    cursor: pointer;
    white-space: nowrap;
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    box-shadow: 0 6px 24px rgba(37,99,235,0.45);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 32px rgba(37,99,235,0.55);
}

.btn--outline {
    background: transparent;
    color: #CBD5E1;
    border: 1px solid rgba(203,213,225,0.35);
}

.btn--outline:hover {
    background: rgba(255,255,255,0.06);
    border-color: rgba(203,213,225,0.6);
    transform: translateY(-2px);
}

.btn__arrow {
    transition: transform var(--transition-fast);
}

.btn:hover .btn__arrow { transform: translateX(3px); }

/* Hero Stats */
.hero__stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xl);
    margin-top: var(--space-3xl);
    padding-top: var(--space-2xl);
    border-top: 1px solid rgba(255,255,255,0.08);
}

.stat__value {
    font-size: 2rem;
    font-weight: 800;
    color: #F8FAFC;
    letter-spacing: -0.03em;
    line-height: 1;
}

.stat__label {
    font-size: 0.8rem;
    color: #64748B;
    font-weight: 500;
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ---------------------------------------------------------
   7. Section Shared Styles
   --------------------------------------------------------- */
.section {
    padding-block: var(--space-4xl);
}

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

.section__header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section__tag {
    display: inline-block;
    background: rgba(37,99,235,0.09);
    color: var(--color-primary);
    border: 1px solid rgba(37,99,235,0.2);
    padding: 0.3rem 0.9rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.section__title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--color-navy);
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.section__desc {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin-inline: auto;
    line-height: 1.7;
}

/* ---------------------------------------------------------
   8. Services Section
   --------------------------------------------------------- */
.services__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
}

.service-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl) var(--space-xl);
    position: relative;
    overflow: hidden;
    transition: transform var(--transition-slow),
                box-shadow var(--transition-slow),
                border-color var(--transition-slow);
    cursor: default;
}

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

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(37,99,235,0.2);
}

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

.service-card__icon-wrap {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-lg);
    position: relative;
    transition: transform var(--transition-base);
}

.service-card:hover .service-card__icon-wrap {
    transform: scale(1.1) rotate(-3deg);
}

.service-card__icon-wrap--blue {
    background: linear-gradient(135deg, rgba(37,99,235,0.12), rgba(37,99,235,0.06));
    border: 1px solid rgba(37,99,235,0.15);
}

.service-card__icon-wrap--cyan {
    background: linear-gradient(135deg, rgba(6,182,212,0.12), rgba(6,182,212,0.06));
    border: 1px solid rgba(6,182,212,0.15);
}

.service-card__icon-wrap--indigo {
    background: linear-gradient(135deg, rgba(99,102,241,0.12), rgba(99,102,241,0.06));
    border: 1px solid rgba(99,102,241,0.15);
}

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

.service-card__number {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-xl);
    font-size: 4rem;
    font-weight: 800;
    color: var(--color-border);
    line-height: 1;
    letter-spacing: -0.05em;
    transition: color var(--transition-slow);
    user-select: none;
}

.service-card:hover .service-card__number {
    color: rgba(37,99,235,0.08);
}

.service-card__title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: var(--space-sm);
    letter-spacing: -0.01em;
}

.service-card__desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.service-card__features {
    margin-top: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.service-card__feature {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.83rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.service-card__feature-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-primary);
    flex-shrink: 0;
}

/* ---------------------------------------------------------
   9. Why Us Section
   --------------------------------------------------------- */
.why {
    background: var(--color-navy);
    color: #F8FAFC;
    position: relative;
    overflow: hidden;
}

.why__bg-pattern {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(ellipse at 20% 50%, rgba(37,99,235,0.15) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(6,182,212,0.10) 0%, transparent 50%);
    pointer-events: none;
}

.why .section__title { color: #F8FAFC; }
.why .section__tag   { background: rgba(255,255,255,0.07); color: #93C5FD; border-color: rgba(147,197,253,0.2); }
.why .section__desc  { color: #94A3B8; }

.why__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    position: relative;
    z-index: 1;
}

.why-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: background var(--transition-base),
                border-color var(--transition-base),
                transform var(--transition-slow);
}

.why-card:hover {
    background: rgba(37,99,235,0.08);
    border-color: rgba(37,99,235,0.25);
    transform: translateY(-4px);
}

.why-card__icon {
    font-size: 1.75rem;
    margin-bottom: var(--space-md);
    line-height: 1;
}

.why-card__title {
    font-size: 1rem;
    font-weight: 700;
    color: #F1F5F9;
    margin-bottom: var(--space-sm);
}

.why-card__desc {
    font-size: 0.875rem;
    color: #64748B;
    line-height: 1.65;
}

/* ---------------------------------------------------------
   10. Contact / Footer Section
   --------------------------------------------------------- */
.contact {
    background: var(--color-bg);
}

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

/* Contact Info */
.contact__info-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
}

.contact__info-text {
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: var(--space-xl);
    font-size: 0.95rem;
}

.contact__details {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

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

.contact__detail-icon {
    width: 40px;
    height: 40px;
    background: rgba(37,99,235,0.09);
    border: 1px solid rgba(37,99,235,0.15);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 1.1rem;
}

.contact__detail-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact__detail-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-navy);
}

/* Contact Form */
.contact__form-wrap {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    box-shadow: var(--shadow-md);
}

.form__title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-navy);
    margin-bottom: var(--space-xl);
}

.form__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

.form__group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.form__label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form__input,
.form__textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--color-text);
    background: var(--color-bg);
    transition: border-color var(--transition-fast),
                box-shadow var(--transition-fast),
                background var(--transition-fast);
    outline: none;
}

.form__input:focus,
.form__textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
    background: var(--color-surface);
}

.form__textarea {
    resize: vertical;
    min-height: 130px;
    line-height: 1.6;
}

.form__submit {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    margin-top: var(--space-sm);
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast),
                opacity var(--transition-fast);
    box-shadow: 0 6px 24px rgba(37,99,235,0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.form__submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 32px rgba(37,99,235,0.45);
}

.form__submit:active { transform: translateY(0); }

.form__submit:disabled {
    opacity: 0.65;
    cursor: not-allowed;
    transform: none;
}

/* Form alerts */
.form__alert {
    padding: 0.85rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    display: none;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    animation: fadeInUp 0.3s ease;
}

.form__alert.show { display: flex; }

.form__alert--success {
    background: rgba(16,185,129,0.09);
    border: 1px solid rgba(16,185,129,0.25);
    color: #065F46;
}

.form__alert--error {
    background: rgba(239,68,68,0.09);
    border: 1px solid rgba(239,68,68,0.25);
    color: #991B1B;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---------------------------------------------------------
   11. Footer
   --------------------------------------------------------- */
.footer {
    background: var(--color-navy);
    color: #64748B;
    padding: var(--space-2xl) 0 var(--space-lg);
}

.footer__top {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid rgba(255,255,255,0.07);
    margin-bottom: var(--space-lg);
}

.footer__brand .logo__text { color: #F8FAFC; }

.footer__tagline {
    margin-top: var(--space-md);
    font-size: 0.875rem;
    color: #475569;
    line-height: 1.6;
    max-width: 280px;
}

.footer__heading {
    font-size: 0.8rem;
    font-weight: 700;
    color: #94A3B8;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: var(--space-md);
}

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

.footer__link {
    font-size: 0.875rem;
    color: #475569;
    transition: color var(--transition-fast);
}

.footer__link:hover { color: var(--color-primary-light); }

.footer__bottom {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    align-items: flex-start;
    font-size: 0.8rem;
}

.footer__copy { color: #334155; }

.footer__legal {
    display: flex;
    gap: var(--space-lg);
}

.footer__legal a {
    color: #334155;
    transition: color var(--transition-fast);
    font-size: 0.8rem;
}

.footer__legal a:hover { color: #64748B; }

/* Back to top */
.back-to-top {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    width: 46px;
    height: 46px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #fff;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6px 20px rgba(37,99,235,0.4);
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast),
                opacity var(--transition-base);
    opacity: 0;
    pointer-events: none;
    z-index: 999;
    cursor: pointer;
}

.back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(37,99,235,0.5);
}

/* ---------------------------------------------------------
   12. Scroll Reveal Animations
   --------------------------------------------------------- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.revealed {
    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; }

/* ---------------------------------------------------------
   13. Responsive — Tablet (≥ 640px)
   --------------------------------------------------------- */
@media (min-width: 640px) {
    .services__grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .form__group--full {
        grid-column: 1 / -1;
    }

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

    .footer__bottom {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

/* ---------------------------------------------------------
   14. Responsive — Desktop (≥ 1024px)
   --------------------------------------------------------- */
@media (min-width: 1024px) {
    .nav { display: flex; }
    .hamburger { display: none; }
    .mobile-menu { display: none; }

    .services__grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .why__grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .contact__layout {
        grid-template-columns: 1fr 1.4fr;
        align-items: start;
    }

    .footer__top {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

/* ---------------------------------------------------------
   15. Accessibility
   --------------------------------------------------------- */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    html { scroll-behavior: auto; }
}