/* ============================================
   VARIÁVEIS CSS
   ============================================ */
:root {
    --bg: #000000;
    --surface: #080808;
    --text-main: #eaeaea;
    --text-muted: #444444;
    --accent: #ffffff;
    --border: #1a1a1a;
    --success: #22c55e;
    --error: #ef4444;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --container-width: 1440px;
}

/* ============================================
   RESET & BASE
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    outline: none;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--bg);
    color: var(--text-main);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ============================================
   LOADER
   ============================================ */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content span {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: 4px;
    color: var(--accent);
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* ============================================
   LAYOUT & WRAPPER
   ============================================ */
.wrapper {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 40px;
    border-left: 1px solid var(--border);
    border-right: 1px solid var(--border);
    min-height: 100vh;
    background: #020202;
    opacity: 0;
    animation: fadeInWrapper 0.6s ease forwards 0.5s;
}

@keyframes fadeInWrapper {
    to { opacity: 1; }
}

/* ============================================
   HEADER
   ============================================ */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 40px 60px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: rgba(2, 2, 2, 0.95);
    backdrop-filter: blur(10px);
    z-index: 100;
    transition: var(--transition);
}

header.scrolled {
    padding: 25px 60px;
    border-bottom-color: var(--accent);
}

.logo {
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: -0.5px;
    color: var(--accent);
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--transition);
}

.logo:hover {
    letter-spacing: 2px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width 0.3s ease;
}

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

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

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    padding: 160px 60px;
    border-bottom: 1px solid var(--border);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 500;
    line-height: 1.1;
    letter-spacing: -2px;
    color: var(--accent);
    max-width: 900px;
    margin-bottom: 30px;
}

.hero p {
    font-size: 1.125rem;
    color: #666;
    max-width: 500px;
    font-weight: 300;
    margin-bottom: 50px;
}

.btn {
    display: inline-block;
    padding: 16px 32px;
    border: 1px solid var(--border);
    color: var(--accent);
    text-decoration: none;
    font-size: 0.85rem;
    transition: var(--transition);
    background: transparent;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--border);
    transition: left 0.4s ease;
    z-index: -1;
}

.btn:hover::before {
    left: 0;
}

.btn:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

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

.fade-in.delay-1 {
    animation-delay: 0.2s;
}

.fade-in.delay-2 {
    animation-delay: 0.4s;
}

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

/* ============================================
   ABOUT SECTION
   ============================================ */
.about {
    padding: 120px 60px;
    border-bottom: 1px solid var(--border);
}

.about-text {
    font-size: 1.5rem;
    line-height: 1.5;
    color: #888;
    max-width: 1000px;
    font-weight: 300;
}

.about-text strong {
    color: var(--accent);
    font-weight: 400;
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects-header {
    padding: 60px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.section-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-muted);
}

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

.card {
    padding: 80px 60px;
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    height: 400px;
    position: relative;
    overflow: hidden;
}

.card:nth-child(3n) {
    border-right: none;
}

.card > span {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: auto;
    transition: var(--transition);
    position: relative;
    z-index: 2;
}

.card h3 {
    font-size: 1.75rem;
    font-weight: 400;
    letter-spacing: -1px;
    color: var(--accent);
    transition: var(--transition);
    position: relative;
    z-index: 2;
    margin-top: auto;
    padding-bottom: 20px;
}

.card-overlay {
    position: absolute;
    bottom: -100%;
    left: 0;
    right: 0;
    padding: 60px;
    padding-top: 80px;
    background: linear-gradient(to top, rgba(8, 8, 8, 0.98) 60%, transparent);
    opacity: 0;
    transition: var(--transition);
    z-index: 1;
}

.card-overlay p {
    color: #999;
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 0;
}

.card:hover {
    background: var(--surface);
    transform: translateY(-5px);
}

.card:hover .card-overlay {
    opacity: 1;
    bottom: 0;
}

.card:hover > span {
    color: var(--accent);
}

.card:hover h3 {
    transform: translateY(-10px);
}

/* ============================================
   PROCESS SECTION
   ============================================ */
.process {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border-bottom: 1px solid var(--border);
}

.step {
    padding: 60px;
    border-right: 1px solid var(--border);
    transition: var(--transition);
}

.step:last-child {
    border-right: none;
}

.step:hover {
    background: var(--surface);
}

.step b {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 15px;
    letter-spacing: 1px;
}

.step p {
    font-size: 1rem;
    color: var(--text-main);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
    padding: 140px 60px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.contact h2 {
    font-size: 2.5rem;
    letter-spacing: -1.5px;
    font-weight: 400;
    line-height: 1.2;
}

form {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.form-group {
    position: relative;
    margin-bottom: 30px;
}

input,
textarea {
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--border);
    padding: 20px 0;
    color: var(--accent);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    width: 100%;
}

input:focus,
textarea:focus {
    border-bottom-color: var(--accent);
    padding-left: 10px;
}

input::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

textarea {
    resize: none;
    height: 100px;
    margin-top: 20px;
}

.error-message {
    position: absolute;
    bottom: -20px;
    left: 0;
    font-size: 0.75rem;
    color: var(--error);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.form-group.error .error-message {
    opacity: 1;
}

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

.submit-btn {
    margin-top: 40px;
    align-self: flex-start;
    background: var(--text-main);
    color: var(--bg);
    border: none;
    padding: 18px 40px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    font-weight: 500;
}

.submit-btn:hover {
    background: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.1);
}

.submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.submit-btn.loading .btn-text {
    opacity: 0;
}

.btn-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid var(--bg);
    border-top-color: transparent;
    border-radius: 50%;
    opacity: 0;
    animation: spin 0.8s linear infinite;
}

.submit-btn.loading .btn-loader {
    opacity: 1;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.form-message {
    margin-top: 20px;
    padding: 15px;
    border-radius: 4px;
    font-size: 0.9rem;
    opacity: 0;
    transform: translateY(-10px);
    transition: var(--transition);
}

.form-message.show {
    opacity: 1;
    transform: translateY(0);
}

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

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

/* ============================================
   FOOTER
   ============================================ */
footer {
    padding: 60px;
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

/* ============================================
   SCROLL TO TOP BUTTON
   ============================================ */
.scroll-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 50px;
    height: 50px;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 99;
}

.scroll-top.show {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background: var(--accent);
    color: var(--bg);
    transform: translateY(-5px);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    .wrapper {
        width: 100%;
        border: none;
        padding: 0;
    }

    header {
        padding: 30px 30px;
    }

    header.scrolled {
        padding: 20px 30px;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 80px;
        right: -100%;
        width: 300px;
        height: calc(100vh - 80px);
        background: var(--surface);
        flex-direction: column;
        padding: 40px;
        border-left: 1px solid var(--border);
        transition: right 0.4s ease;
    }

    .nav.active {
        right: 0;
    }

    .nav-link {
        font-size: 1.2rem;
    }

    .hero {
        padding: 100px 30px;
    }

    .hero h1 {
        font-size: 2.5rem;
        letter-spacing: -1px;
    }

    .hero p {
        font-size: 1rem;
    }

    .about {
        padding: 80px 30px;
    }

    .about-text {
        font-size: 1.2rem;
    }

    .projects-header {
        padding: 40px 30px;
    }

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

    .card {
        border-right: none;
        height: auto;
        padding: 60px 30px;
    }

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

    .step {
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 40px 30px;
    }

    .step:last-child {
        border-bottom: none;
    }

    .contact {
        grid-template-columns: 1fr;
        padding: 80px 30px;
        gap: 40px;
    }

    .contact h2 {
        font-size: 2rem;
    }

    footer {
        padding: 40px 30px;
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }

    .scroll-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media (max-width: 640px) {
    html {
        font-size: 14px;
    }

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

    .about-text {
        font-size: 1rem;
    }

    .contact h2 {
        font-size: 1.5rem;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .loader,
    .mobile-menu-btn,
    .scroll-top,
    form {
        display: none;
    }
}