/* Core System */
:root {
    --color-brand-primary: #d89a3b;
    --color-brand-primary-strong: #bc7e24;
    --color-brand-primary-soft: #f3d7a9;
    --color-service-icon: #7fd4ff;
    --color-service-icon-hover: #a7e5ff;
    --color-whatsapp: #128c7e;
    --color-whatsapp-hover: #0f786d;
    --color-whatsapp-icon: #ffffff;
    --color-surface-0: #111318;
    --color-surface-1: #171a20;
    --color-surface-2: #1c2129;
    --color-surface-3: #232a34;
    --color-ink-strong: #f3f4f7;
    --color-ink-default: #d7d9df;
    --color-ink-muted: #9ca3b2;
    --color-border-subtle: #2b313c;
    --color-border-default: #39404d;
    --color-border-strong: #4b5464;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 32px;
    --space-5: 40px;
    --space-6: 48px;
    --space-7: 64px;
    --spot-size: 260px;
    --spot-alpha-soft: 0.14;
    --keyboard-inset: 0px;
    --primary-color: var(--color-brand-primary);
    --secondary-color: var(--color-brand-primary-strong);
    --text-color: var(--color-ink-default);
    --light-bg: var(--color-surface-1);
    --dark-bg: var(--color-surface-0);
    --white: var(--color-ink-strong);
    --gradient-primary: linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-primary-strong) 100%);
    --gradient-hero: linear-gradient(180deg, rgba(17, 19, 24, 0.4) 0%, rgba(17, 19, 24, 0.9) 100%);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --transition-fast: 160ms ease;
    --transition-base: 180ms ease;
    --transition-slow: 300ms ease;
}

* {
    box-sizing: border-box;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    padding: 12px 24px;
    background-color: var(--color-brand-primary);
    color: #1c1407;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 12px;
    outline: 2px solid var(--color-ink-strong);
    outline-offset: 2px;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "Manrope", "Segoe UI", sans-serif;
    line-height: 1.6;
    color: var(--color-ink-default);
    background-color: var(--color-surface-0);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--space-3);
}

h1,
h2,
h3 {
    margin-top: 0;
    margin-bottom: var(--space-2);
    font-family: "Sora", "Segoe UI", sans-serif;
    color: var(--color-ink-strong);
    letter-spacing: -0.02em;
}

p {
    margin-top: 0;
    margin-bottom: var(--space-2);
    color: var(--color-ink-default);
}

a {
    color: inherit;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-brand-primary);
    outline-offset: 2px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    background-color: var(--color-brand-primary);
    color: #1c1407;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    transition: background-color var(--transition-base), transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.btn:hover {
    background-color: var(--color-brand-primary-strong);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-primary {
    background: var(--gradient-primary);
    box-shadow: 0 4px 14px rgba(216, 154, 59, 0.35);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(216, 154, 59, 0.45);
}

.btn-secondary {
    background-color: transparent;
    border-color: var(--color-brand-primary);
    color: var(--color-brand-primary);
}

.btn-secondary:hover {
    background-color: var(--color-brand-primary);
    color: #1c1407;
}

/* Header & Navigation */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 14px 0;
    border-bottom: 1px solid var(--color-border-subtle);
    background-color: rgba(17, 19, 24, 0.92);
    backdrop-filter: blur(6px);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-2);
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1.65rem;
    font-weight: 700;
    text-decoration: none;
}

.logo svg {
    color: var(--color-brand-primary);
}

.logo span {
    color: var(--color-ink-strong);
}

nav ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
    gap: 8px;
}

nav ul li {
    margin: 0;
}

nav ul li a {
    display: inline-block;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-ink-muted);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

nav ul li a:hover,
nav ul li a:focus-visible {
    color: var(--color-ink-strong);
    background-color: var(--color-surface-2);
}

nav ul li a.active {
    color: var(--color-brand-primary);
    background-color: rgba(216, 154, 59, 0.1);
}

.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 10px 8px;
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    background: var(--color-surface-1);
    color: var(--color-ink-strong);
    cursor: pointer;
    transition: border-color 180ms ease, background-color 180ms ease;
}

.menu-toggle:hover {
    border-color: var(--color-border-strong);
    background-color: var(--color-surface-2);
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    margin: 4px 0;
    background-color: var(--color-brand-primary);
    transition: transform 180ms ease, opacity 180ms ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* Hero */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 20px;
    background:
        var(--gradient-hero),
        url("https://images.unsplash.com/photo-1517694712202-14dd9538aa97?q=80&w=2070&auto=format&fit=crop&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D") no-repeat center/cover;
    border-bottom: 1px solid var(--color-border-subtle);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(216, 154, 59, 0.1) 0%, transparent 60%);
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background-color: rgba(216, 154, 59, 0.15);
    border: 1px solid var(--color-brand-primary);
    border-radius: 99px;
    color: var(--color-brand-primary);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
    animation: fadeInDown 0.6s ease-out;
}

.hero h1 {
    font-size: clamp(2.2rem, 6vw, 4rem);
    margin-bottom: var(--space-3);
    line-height: 1.1;
    animation: fadeInUp 0.7s ease-out 0.1s both;
}

.hero p {
    max-width: 760px;
    margin: 0 auto var(--space-4);
    font-size: clamp(1.05rem, 2.5vw, 1.3rem);
    color: var(--color-ink-default);
    line-height: 1.7;
    animation: fadeInUp 0.7s ease-out 0.2s both;
}

.hero-cta-group {
    display: flex;
    gap: var(--space-2);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-5);
    animation: fadeInUp 0.7s ease-out 0.3s both;
}

.hero-stats {
    display: flex;
    gap: var(--space-6);
    justify-content: center;
    flex-wrap: wrap;
    padding-top: var(--space-4);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    animation: fadeInUp 0.7s ease-out 0.4s both;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-number {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--color-brand-primary);
    font-family: "Sora", sans-serif;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-ink-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Sections */
section {
    padding: var(--space-7) 0;
}

section:nth-of-type(even) {
    background-color: var(--color-surface-1);
}

section h2 {
    text-align: center;
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    margin-bottom: var(--space-2);
}

.section-intro {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-5);
    font-size: 1.05rem;
    color: var(--color-ink-muted);
}

/* Services */
.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-3);
}

.service-item {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    --spot-x: 50%;
    --spot-y: 50%;
    padding: var(--space-4);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-lg);
    background-color: var(--color-surface-2);
    text-align: center;
    transition: border-color 180ms ease, transform 180ms ease, background-color 180ms ease;
}

.service-item::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0;
    background: radial-gradient(
        circle var(--spot-size) at var(--spot-x) var(--spot-y),
        rgba(216, 154, 59, var(--spot-alpha-soft)),
        rgba(216, 154, 59, 0) 70%
    );
    transition: opacity 180ms ease;
}

.service-item > * {
    position: relative;
    z-index: 1;
}

.service-item:hover {
    transform: translateY(-4px);
    border-color: var(--color-border-strong);
    background-color: var(--color-surface-3);
}

.service-item:hover::before,
.service-item:focus-within::before {
    opacity: 1;
}

.service-item h3 {
    font-size: 1.3rem;
}

.service-item svg {
    margin-bottom: var(--space-2);
    color: var(--color-service-icon);
    transition: color 180ms ease;
}

.service-item:hover svg {
    color: var(--color-service-icon-hover);
}

/* Portfolio */
.portfolio p {
    text-align: center;
    margin-bottom: var(--space-3);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-3);
}

.portfolio-item {
    margin: 0;
    min-height: 100%;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: relative;
    isolation: isolate;
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-lg);
    background-color: var(--color-surface-2);
    overflow: hidden;
    --spot-x: 50%;
    --spot-y: 50%;
}

.portfolio-item::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0;
    background: radial-gradient(
        circle var(--spot-size) at var(--spot-x) var(--spot-y),
        rgba(216, 154, 59, var(--spot-alpha-soft)),
        rgba(216, 154, 59, 0) 72%
    );
    transition: opacity 180ms ease;
}

.portfolio-item > * {
    position: relative;
    z-index: 1;
}

.portfolio-item:hover::before,
.portfolio-item:focus-within::before {
    opacity: 1;
}

.portfolio-item img {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

.portfolio-caption {
    padding: 12px 14px 14px;
    border-top: 1px solid var(--color-border-subtle);
    background-color: var(--color-surface-3);
    opacity: 0.92;
    transform: translateY(8px);
    transition: transform 180ms ease, opacity 180ms ease;
}

.portfolio-item:hover .portfolio-caption,
.portfolio-item:focus-within .portfolio-caption {
    opacity: 1;
    transform: translateY(0);
}

.portfolio-caption strong {
    display: block;
    margin-bottom: 4px;
    font-family: "Sora", "Segoe UI", sans-serif;
    font-size: 0.96rem;
    letter-spacing: -0.01em;
    color: var(--color-ink-strong);
}

.portfolio-caption p {
    margin: 0;
    font-size: 0.93rem;
    color: var(--color-ink-default);
}

/* About */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    align-items: center;
}

.about-content h3 {
    font-size: 1.3rem;
    margin-top: var(--space-4);
    margin-bottom: var(--space-2);
    color: var(--color-brand-primary);
}

.about-content h3:first-child {
    margin-top: 0;
}

.about-content p {
    color: var(--color-ink-default);
    line-height: 1.7;
}

.values-list {
    list-style: none;
    padding: 0;
    margin: var(--space-3) 0 0;
}

.values-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    color: var(--color-ink-default);
}

.values-list li svg {
    color: var(--color-brand-primary);
    flex-shrink: 0;
}

.about-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

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

/* Technologies */
.technologies {
    background: linear-gradient(180deg, var(--color-surface-0) 0%, var(--color-surface-1) 100%);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-4);
}

.tech-category {
    padding: var(--space-4);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-lg);
    background-color: var(--color-surface-2);
    transition: border-color var(--transition-base), transform var(--transition-base);
}

.tech-category:hover {
    border-color: var(--color-border-strong);
    transform: translateY(-4px);
}

.tech-category h3 {
    font-size: 1.1rem;
    margin-bottom: var(--space-3);
    color: var(--color-brand-primary);
}

.tech-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tech-badge {
    display: inline-block;
    padding: 6px 14px;
    background-color: rgba(127, 212, 255, 0.1);
    border: 1px solid rgba(127, 212, 255, 0.3);
    border-radius: 99px;
    color: var(--color-service-icon-hover);
    font-size: 0.875rem;
    font-weight: 500;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.tech-badge:hover {
    background-color: rgba(127, 212, 255, 0.2);
    border-color: var(--color-service-icon);
}

/* Testimonials */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-4);
}

.testimonial-card {
    padding: var(--space-5);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-lg);
    background-color: var(--color-surface-2);
    transition: border-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
}

.testimonial-card:hover {
    border-color: var(--color-border-strong);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.testimonial-rating {
    display: flex;
    gap: 4px;
    margin-bottom: var(--space-3);
    color: var(--color-brand-primary);
}

.testimonial-card blockquote {
    margin: 0 0 var(--space-4);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-ink-default);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--color-surface-3);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-brand-primary);
    border: 2px solid var(--color-border-subtle);
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-info strong {
    color: var(--color-ink-strong);
    font-size: 0.95rem;
}

.author-info span {
    color: var(--color-ink-muted);
    font-size: 0.875rem;
}

/* Clients */
.clients {
    background-color: var(--color-surface-1);
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-4);
    align-items: center;
}

.client-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-md);
    background-color: var(--color-surface-2);
    transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.client-logo:hover {
    border-color: var(--color-border-strong);
    transform: scale(1.05);
}

.client-logo svg {
    max-width: 120px;
    height: auto;
}

/* Contact */
.contact-options {
    max-width: 620px;
    margin: 0 auto var(--space-4);
    padding: var(--space-4);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-lg);
    background-color: var(--color-surface-2);
}

.contact-direct-text {
    margin: 0 0 var(--space-3);
    color: var(--color-ink-muted);
    font-size: 0.95rem;
}

.contact-direct-actions {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
    align-items: center;
}

.contact-direct-actions .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.copy-status {
    margin: var(--space-2) 0 0;
    font-size: 0.875rem;
    color: var(--color-service-icon);
    min-height: 20px;
}

.contact form {
    max-width: 620px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.form-label {
    color: var(--color-ink-muted);
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.78rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.form-note {
    margin: 4px 0 2px;
    font-size: 0.88rem;
    color: var(--color-ink-muted);
}

.form-status {
    min-height: 20px;
    margin: 0;
    font-size: 0.86rem;
    color: var(--color-service-icon);
}

.contact form input[type="text"],
.contact form input[type="email"],
.contact form textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    background-color: var(--color-surface-2);
    color: var(--color-ink-strong);
    font-size: 1rem;
    transition: border-color 150ms ease, background-color 150ms ease;
}

.contact form input::placeholder,
.contact form textarea::placeholder {
    color: #7e8798;
}

.contact form input:hover,
.contact form textarea:hover {
    border-color: var(--color-border-strong);
}

.contact form input:focus,
.contact form textarea:focus {
    border-color: var(--color-brand-primary);
    background-color: var(--color-surface-3);
    outline: none;
}

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

.contact form button {
    margin-top: 6px;
    align-self: flex-start;
}

/* Footer */
footer {
    margin-top: 50px;
    padding: var(--space-6) 0 var(--space-4);
    border-top: 1px solid var(--color-border-subtle);
    background-color: var(--color-surface-1);
    color: var(--color-ink-muted);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: var(--space-5);
    margin-bottom: var(--space-5);
}

.footer-about .footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-ink-strong);
    text-decoration: none;
    margin-bottom: var(--space-2);
}

.footer-about .footer-logo svg {
    color: var(--color-brand-primary);
}

.footer-about > p {
    color: var(--color-ink-muted);
    line-height: 1.7;
    margin-bottom: var(--space-3);
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-surface-2);
    color: var(--color-ink-muted);
    transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.footer-social a:hover {
    background-color: var(--color-brand-primary);
    color: #1c1407;
    transform: translateY(-3px);
}

.footer-links h4,
.footer-services h4,
.footer-contact h4 {
    color: var(--color-ink-strong);
    font-size: 1rem;
    margin-bottom: var(--space-3);
    font-family: "Sora", sans-serif;
}

.footer-links ul,
.footer-services ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li,
.footer-services li {
    padding: 8px 0;
    color: var(--color-ink-muted);
    font-size: 0.95rem;
}

.footer-links a {
    color: var(--color-ink-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-brand-primary);
}

.contact-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.contact-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    color: var(--color-ink-muted);
    font-size: 0.95rem;
}

.contact-list li svg {
    color: var(--color-brand-primary);
    flex-shrink: 0;
}

.contact-list a {
    color: var(--color-ink-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-list a:hover {
    color: var(--color-brand-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-subtle);
    flex-wrap: wrap;
    gap: var(--space-3);
}

.footer-bottom p {
    margin: 0;
    font-size: 0.9rem;
}

.footer-legal {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.footer-legal a {
    color: var(--color-ink-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

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

/* Floating WhatsApp */
.whatsapp-float {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 56px;
    height: 56px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.22);
    background-color: var(--color-whatsapp);
    color: var(--color-whatsapp-icon);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    z-index: 1200;
    transition: background-color 160ms ease, transform 160ms ease;
}

.whatsapp-float:hover {
    background-color: var(--color-whatsapp-hover);
    transform: translateY(-2px);
}

.whatsapp-float:active {
    transform: translateY(0);
}

.whatsapp-icon {
    width: 30px;
    height: 30px;
}

.whatsapp-tooltip {
    position: absolute;
    right: calc(100% + 12px);
    top: 50%;
    transform: translateY(-50%) translateX(6px);
    white-space: nowrap;
    font-size: 0.8rem;
    font-family: "IBM Plex Mono", monospace;
    color: var(--color-ink-strong);
    background-color: var(--color-surface-3);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 160ms ease, transform 160ms ease;
}

.whatsapp-float:hover .whatsapp-tooltip,
.whatsapp-float:focus-visible .whatsapp-tooltip {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    right: 24px;
    bottom: 96px;
    width: 56px;
    height: 56px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.22);
    background-color: var(--color-brand-primary);
    color: var(--color-ink-strong);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1200;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: opacity 300ms ease-out, transform 300ms ease-out, visibility 300ms ease-out, background-color var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: var(--shadow-md);
}

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

.back-to-top:hover {
    background-color: var(--color-brand-primary-strong);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(216, 154, 59, 0.4);
}

.back-to-top:active {
    transform: translateY(-1px) scale(0.95);
}

.back-to-top:focus-visible {
    outline: 2px solid var(--color-ink-strong);
    outline-offset: 2px;
}

.back-to-top svg {
    width: 24px;
    height: 24px;
    transition: transform var(--transition-fast);
}

.back-to-top:hover svg {
    transform: translateY(-2px);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-2);
    }

    header .container {
        flex-wrap: wrap;
    }

    .menu-toggle {
        display: inline-block;
    }

    nav ul {
        width: 100%;
        margin-top: 12px;
        display: block;
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        pointer-events: none;
        border: 1px solid transparent;
        border-radius: var(--radius-md);
        background-color: var(--color-surface-1);
        transition: max-height 220ms ease, opacity 220ms ease, border-color 220ms ease;
    }

    nav ul.open {
        max-height: calc(var(--menu-height, 0px) + 16px);
        opacity: 1;
        pointer-events: auto;
        border-color: var(--color-border-subtle);
    }

    nav ul li + li {
        border-top: 1px solid var(--color-border-subtle);
    }

    nav ul li a {
        display: block;
        padding: 12px var(--space-2);
        border-radius: 0;
    }

    .hero {
        min-height: 70vh;
        padding: 80px 18px;
    }

    .hero-stats {
        gap: var(--space-4);
    }

    .hero-cta-group {
        flex-direction: column;
        align-items: center;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .about-image {
        order: -1;
    }

    .tech-grid {
        grid-template-columns: 1fr;
    }

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

    .clients-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .footer-legal {
        justify-content: center;
    }

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

    .whatsapp-float {
        right: 16px;
        bottom: calc(16px + var(--keyboard-inset) + env(safe-area-inset-bottom));
    }

    .back-to-top {
        right: 16px;
        bottom: calc(72px + var(--keyboard-inset) + env(safe-area-inset-bottom));
    }

    .whatsapp-tooltip {
        display: none;
    }
}

@media (hover: none) {
    .service-item::before,
    .portfolio-item::before {
        display: none;
    }

    .portfolio-caption {
        opacity: 1;
        transform: none;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.4rem;
    }

    .hero h1 {
        font-size: 2rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 1ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 1ms !important;
        scroll-behavior: auto !important;
    }
}