/* ============================================
   WSTECH-AI - Site Institucional
   CSS Variables & Reset
   ============================================ */
:root {
    --color-bg: #0a0b0d;
    --color-bg-elevated: #111318;
    --color-surface: #181b22;
    --color-border: #2a2f3a;
    
    --color-primary: #00d4aa;
    --color-primary-hover: #00f5c4;
    --color-primary-muted: rgba(0, 212, 170, 0.15);
    
    --color-text: #e8eaed;
    --color-text-muted: #9aa0a6;
    --color-text-dim: #5f6368;
    
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    
    --header-height: 72px;
    --container-max: 1200px;
    --section-padding: 100px;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s, opacity 0.2s;
}

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

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

/* ============================================
   Container
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   Header / Navigation
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: url('../img/wstech-ai-fundo01.png') center / cover no-repeat;
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: background 0.3s, box-shadow 0.3s;
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

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

.nav__logo {
    display: flex;
    align-items: center;
}

.nav__logo-img {
    height: 80px;
    width: auto;
    display: block;
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: 36px;
    list-style: none;
}

.nav__link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

.nav__link:hover {
    color: var(--color-text);
}

.nav__cta {
    color: #b4a05a;
    padding: 8px 18px;
    border: 1px solid #b4a05a;
    border-radius: var(--radius-md);
}

.nav__cta:hover {
    background: rgba(180, 160, 90, 0.15);
    border-color: #b4a05a;
    color: #b4a05a;
}

/* Mobile toggle */
.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 8px;
    background: transparent;
}

.nav__toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: transform 0.3s, opacity 0.3s;
}

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

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

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

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all 0.2s;
}

.btn--primary {
    background: var(--color-primary);
    color: var(--color-bg);
}

.btn--primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(0, 212, 170, 0.35);
}

.btn--cta {
    background: transparent;
    color: #b4a05a;
    border: 1px solid #b4a05a;
    padding: 8px 18px;
}

.btn--cta:hover {
    background: rgba(180, 160, 90, 0.15);
    border-color: #b4a05a;
    color: #b4a05a;
}

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

.hero__bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% 0%, var(--color-primary-muted) 0%, transparent 60%),
        radial-gradient(ellipse 60% 40% at 80% 60%, rgba(0, 100, 200, 0.08) 0%, transparent 50%);
}

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

.hero__tag {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 20px;
}

.hero__title {
    font-size: clamp(1.85rem, 4.2vw, 3rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-top: 24px;
    margin-bottom: 24px;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary) 0%, #00a8ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 36px;
    line-height: 1.7;
}

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

.section__title {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.section__title--center {
    text-align: center;
}

.section__subtitle {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    text-align: center;
    margin-bottom: 48px;
}

/* ============================================
   About
   ============================================ */
.about {
    background: var(--color-bg-elevated);
}

.about__grid {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 60px;
    align-items: center;
}

.about__text {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 500px;
}

.about__stats {
    display: flex;
    gap: 40px;
}

.stat-card {
    text-align: center;
    padding: 32px 40px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    min-width: 180px;
}

.stat__number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    display: inline;
}

.stat__suffix {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat__label {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* ============================================
   Services
   ============================================ */
.services__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.service-card {
    padding: 36px 28px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}

.service-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.service-card__icon {
    width: 48px;
    height: 48px;
    margin-bottom: 20px;
}

.service-card__icon svg {
    width: 100%;
    height: 100%;
    stroke: var(--color-primary);
}

.service-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.service-card__text {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ============================================
   Platform
   ============================================ */
.platform {
    position: relative;
    background: #F8F5F1;
    padding: var(--section-padding) 0;
    color: #2B2B2B;
}

.platform__tag {
    position: absolute;
    top: 24px;
    left: 24px;
    padding: 6px 12px;
    background: #000;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.platform__header {
    text-align: center;
    margin-bottom: 56px;
    padding: 0 24px;
}

.platform__label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: #E3000F;
    margin-bottom: 12px;
}

.platform__title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 16px;
    color: #2B2B2B;
}

.platform__subtitle {
    font-size: 1.15rem;
    color: #555;
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.6;
}

.platform__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-top: 48px;
}

.platform__card {
    text-align: center;
    padding: 24px 16px;
}

.platform__icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 24px;
}

.platform__icon svg {
    width: 100%;
    height: 100%;
    stroke: #E3000F;
}

.platform__card-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: #2B2B2B;
}

.platform__card-text {
    font-size: 0.95rem;
    color: #555;
    line-height: 1.6;
}

@media (max-width: 992px) {
    .platform__grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .platform__tag {
        top: 16px;
        left: 16px;
        font-size: 0.7rem;
    }

    .platform__icon {
        width: 64px;
        height: 64px;
    }
}

/* ============================================
   Newsletter
   ============================================ */
.newsletter {
    background: var(--color-bg-elevated);
}

.newsletter__box {
    max-width: 560px;
    margin: 0 auto;
    padding: 48px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
}

.newsletter__title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.newsletter__subtitle {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 28px;
}

.newsletter__form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.newsletter__input {
    padding: 14px 18px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
}

.newsletter__input::placeholder {
    color: var(--color-text-dim);
}

.newsletter__input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.newsletter__btn {
    align-self: flex-start;
}

/* ============================================
   Projects
   ============================================ */
.projects__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.project-card {
    position: relative;
    padding: 48px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color 0.3s, transform 0.3s;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), #00a8ff);
    opacity: 0;
    transition: opacity 0.3s;
}

.project-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

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

.project-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.project-card__text {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 20px;
}

.project-card__link {
    font-weight: 600;
    color: var(--color-primary);
}

.project-card__link:hover {
    color: var(--color-primary-hover);
}

/* ============================================
   Contact
   ============================================ */
.contact {
    background: var(--color-bg-elevated);
}

.contact .container {
    padding: 0 16px;
}

.contact__intro {
    max-width: 960px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 40px;
}

.contact__intro .highlight {
    color: #e9cb7b;
    font-weight: 700;
}

.contact__intro .highlight-light {
    color: #ffffff;
}

.hero-inline-logo {
    height: 1.2em;
    width: auto;
    vertical-align: middle;
    display: inline-block;
}

.contact__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
    max-width: 900px;
    margin: 0 auto;
}

.contact__info h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.contact__info p {
    color: var(--color-text-muted);
    margin-bottom: 28px;
}

.contact__details {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact__item {
    color: var(--color-text);
}

.contact__label {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.contact__form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact__form input,
.contact__form textarea {
    padding: 14px 18px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
}

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

.contact__form input:focus,
.contact__form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.contact__form textarea {
    resize: vertical;
    min-height: 120px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 32px 0;
    border-top: 1px solid var(--color-border);
}

.footer__content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer__logo {
    display: inline-block;
}

.footer__logo-img {
    height: 36px;
    width: auto;
    display: block;
}

.footer__copy {
    font-size: 0.9rem;
    color: var(--color-text-dim);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 992px) {
    .about__grid {
        grid-template-columns: 1fr;
    }
    
    .about__stats {
        justify-content: flex-start;
    }
    
    .services__grid {
        grid-template-columns: 1fr;
    }
    
    .projects__grid {
        grid-template-columns: 1fr;
    }
    
    .contact__grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px;
    }
    
    .nav__menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        padding: 24px;
        background: var(--color-bg-elevated);
        border-bottom: 1px solid var(--color-border);
        gap: 20px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s;
    }
    
    .nav__menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav__toggle {
        display: flex;
    }
    
    .about__stats {
        flex-direction: column;
    }
    
    .stat-card {
        min-width: 100%;
    }
    
    .newsletter__box {
        padding: 32px 24px;
    }
    
    .footer__content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero__title {
        font-size: 1.9rem;
    }
    
    .section__title {
        font-size: 1.6rem;
    }
}