/* =====================================================
   KAUAN FERREIRA - PORTFOLIO
   Design: Minimalista Tech com toques modernos
   ===================================================== */

/* ===== CSS VARIABLES ===== */
:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #18181b;
    --bg-card: #1a1a1d;
    --accent-primary: #22c55e;
    --accent-secondary: #10b981;
    --accent-gradient: linear-gradient(135deg, #22c55e 0%, #10b981 50%, #059669 100%);
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --code-keyword: #c084fc;
    --code-string: #22c55e;
    --code-class: #60a5fa;
    --code-method: #fbbf24;
    --border-color: #27272a;
    --border-hover: #3f3f46;
    --glow-color: rgba(34, 197, 94, 0.15);
    --font-primary: 'Sora', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --section-padding: 100px 0;
    --container-width: 1200px;
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent-primary); color: var(--bg-primary); }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-hover); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-primary); }

.container { max-width: var(--container-width); margin: 0 auto; padding: 0 24px; }
.text-gradient { background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.code-symbol { color: var(--accent-primary); font-family: var(--font-mono); }

/* CUSTOM CURSOR */
.cursor, .cursor-follower { display: none; }
@media (pointer: fine) {
    * { cursor: none !important; }
    .cursor { display: block; position: fixed; width: 8px; height: 8px; background: var(--accent-primary); border-radius: 50%; pointer-events: none; z-index: 9999; transform: translate(-50%, -50%); transition: transform 0.1s ease; }
    .cursor-follower { display: block; position: fixed; width: 32px; height: 32px; border: 1px solid var(--accent-primary); border-radius: 50%; pointer-events: none; z-index: 9998; transform: translate(-50%, -50%); transition: transform 0.15s ease, width 0.2s ease, height 0.2s ease; opacity: 0.5; }
    .cursor.hover { transform: translate(-50%, -50%) scale(2); }
    .cursor-follower.hover { width: 48px; height: 48px; opacity: 0.3; }
}

/* HEADER */
.header { position: fixed; top: 0; left: 0; width: 100%; z-index: 100; background: rgba(10, 10, 11, 0.8); backdrop-filter: blur(20px); border-bottom: 1px solid transparent; transition: border-color var(--transition-base); }
.header.scrolled { border-bottom-color: var(--border-color); }
.nav { display: flex; justify-content: space-between; align-items: center; height: 72px; }
.nav__logo { font-family: var(--font-mono); font-size: 1.5rem; font-weight: 700; color: var(--text-primary); text-decoration: none; transition: color var(--transition-fast); }
.nav__logo .logo-bracket { color: var(--accent-primary); }
.nav__logo:hover { color: var(--accent-primary); }
.nav__menu { display: flex; gap: 8px; list-style: none; }
.nav__link { position: relative; padding: 8px 16px; color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; font-weight: 500; transition: color var(--transition-fast); border-radius: 8px; }
.nav__link::before { content: ''; position: absolute; bottom: 4px; left: 16px; right: 16px; height: 2px; background: var(--accent-primary); transform: scaleX(0); transition: transform var(--transition-base); }
.nav__link:hover, .nav__link.active { color: var(--text-primary); }
.nav__link.active::before, .nav__link:hover::before { transform: scaleX(1); }
.nav__toggle { display: none; flex-direction: column; gap: 5px; background: transparent; border: none; cursor: pointer; padding: 8px; }
.nav__toggle span { display: block; width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: var(--transition-base); }

/* HERO */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; padding-top: 72px; padding-bottom: 120px; overflow: hidden; }
.hero__background { position: absolute; inset: 0; z-index: -1; }
.hero__grid { position: absolute; inset: 0; background-image: linear-gradient(rgba(34, 197, 94, 0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(34, 197, 94, 0.03) 1px, transparent 1px); background-size: 60px 60px; mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 70%, transparent 110%); }
.hero__content { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; padding: 60px 0; }
.hero__greeting { font-family: var(--font-mono); font-size: 1rem; color: var(--accent-primary); margin-bottom: 16px; }
.hero__name { font-size: clamp(3rem, 8vw, 5rem); font-weight: 700; line-height: 1.1; margin-bottom: 16px; letter-spacing: -0.02em; }
.hero__title { font-size: clamp(1.25rem, 3vw, 1.5rem); font-weight: 400; color: var(--text-secondary); margin-bottom: 24px; }
.hero__description { font-size: 1.1rem; color: var(--text-secondary); max-width: 480px; margin-bottom: 32px; }
.hero__description strong { color: var(--text-primary); }
.hero__buttons { display: flex; gap: 16px; flex-wrap: wrap; }

/* BUTTONS */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 28px; font-family: var(--font-primary); font-size: 0.95rem; font-weight: 500; text-decoration: none; border-radius: 12px; border: none; cursor: pointer; transition: all var(--transition-base); }
.btn--primary { background: var(--accent-gradient); color: var(--bg-primary); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px var(--glow-color); }
.btn--secondary { background: transparent; color: var(--text-primary); border: 1px solid var(--border-color); }
.btn--secondary:hover { border-color: var(--accent-primary); background: rgba(34, 197, 94, 0.1); }
.btn--outline { background: transparent; color: var(--text-primary); border: 1px solid var(--border-color); }
.btn--outline:hover { border-color: var(--accent-primary); color: var(--accent-primary); }
.btn--outline i { font-size: 1.25rem; }

/* CODE WINDOW */
.hero__visual { display: flex; justify-content: center; }
.code-window { width: 100%; max-width: 480px; background: var(--bg-card); border-radius: 16px; border: 1px solid var(--border-color); overflow: hidden; box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.05), 0 20px 50px -10px rgba(0, 0, 0, 0.5); animation: float 6s ease-in-out infinite; }
@keyframes float { 0%, 100% { transform: translateY(0px); } 50% { transform: translateY(-10px); } }
.code-window__header { display: flex; align-items: center; gap: 12px; padding: 12px 16px; background: var(--bg-tertiary); border-bottom: 1px solid var(--border-color); }
.code-window__dots { display: flex; gap: 6px; }
.code-window__dots span { width: 12px; height: 12px; border-radius: 50%; }
.code-window__dots span:nth-child(1) { background: #ff5f56; }
.code-window__dots span:nth-child(2) { background: #ffbd2e; }
.code-window__dots span:nth-child(3) { background: #27c93f; }
.code-window__title { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-muted); }
.code-window__content { padding: 20px; overflow-x: auto; }
.code-window__content pre { font-family: var(--font-mono); font-size: 0.85rem; line-height: 1.7; }
.code-keyword { color: var(--code-keyword); }
.code-string { color: var(--code-string); }
.code-class { color: var(--code-class); }
.code-method { color: var(--code-method); }

/* HERO BOTTOM */
.hero__bottom { position: absolute; bottom: 0; left: 0; right: 0; display: flex; flex-direction: column; align-items: center; }
.scroll-indicator { display: flex; flex-direction: column; align-items: center; gap: 8px; color: var(--text-muted); text-decoration: none; font-size: 0.75rem; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.1em; transition: color var(--transition-base); margin-bottom: 20px; }
.scroll-indicator:hover { color: var(--accent-primary); }
.scroll-indicator__line { width: 1px; height: 40px; background: linear-gradient(to bottom, var(--accent-primary), transparent); animation: scrollLine 2s ease-in-out infinite; }
@keyframes scrollLine { 0%, 100% { transform: scaleY(1); opacity: 1; } 50% { transform: scaleY(0.5); opacity: 0.5; } }

/* TECH CAROUSEL */
.tech-carousel { 
    width: 100%; 
    padding: 20px 0; 
    overflow: hidden; 
    background: rgba(10, 10, 11, 0.9); 
    border-top: 1px solid var(--border-color); 
}

.tech-carousel__track { 
    display: flex;
    gap: 50px;
    animation: carouselScroll 20s linear infinite;
    width: max-content; 
}

.tech-carousel__item { display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.tech-carousel__item i { font-size: 1.6rem; color: rgba(255, 255, 255, 0.5); transition: all var(--transition-base); filter: grayscale(100%) brightness(2); }
.tech-carousel__item:hover i { color: rgba(255, 255, 255, 0.9); transform: scale(1.2); }
@keyframes carouselScroll { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }

/* SECTION STYLES */
section { padding: var(--section-padding); }
.section-header { margin-bottom: 60px; }
.section-header--center { text-align: center; }
.section-tag { display: inline-block; font-family: var(--font-mono); font-size: 0.875rem; color: var(--accent-primary); margin-bottom: 12px; }
.section-title { font-size: clamp(2rem, 5vw, 3rem); font-weight: 700; letter-spacing: -0.02em; }
.section-subtitle { font-size: 1.1rem; color: var(--text-secondary); max-width: 500px; margin: 16px auto 0; }

/* ABOUT SECTION */
.about { background: var(--bg-secondary); }
.about__content { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.about__text p { color: var(--text-secondary); margin-bottom: 20px; }
.about__text p:first-of-type { font-size: 1.15rem; }
.about__text strong { color: var(--accent-primary); }

/* DOWNLOAD CV BUTTON */
.btn-download-cv { display: inline-flex; align-items: center; gap: 10px; padding: 14px 28px; background: var(--accent-gradient); color: var(--bg-primary); font-size: 0.95rem; font-weight: 600; text-decoration: none; border-radius: 12px; transition: all var(--transition-base); margin-top: 10px; }
.btn-download-cv:hover { transform: translateY(-3px); box-shadow: 0 10px 30px var(--glow-color); }
.btn-download-cv svg { stroke: var(--bg-primary); }

/* INFO CARDS */
.about__info { display: flex; flex-direction: column; gap: 16px; }
.info-card { display: flex; align-items: center; gap: 16px; padding: 20px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; transition: all var(--transition-base); }
.info-card:hover { border-color: var(--accent-primary); transform: translateX(8px); }
.info-card__icon { display: flex; align-items: center; justify-content: center; width: 48px; height: 48px; background: rgba(34, 197, 94, 0.1); border-radius: 10px; color: var(--accent-primary); }
.info-card__label { display: block; font-size: 0.8rem; color: var(--text-muted); margin-bottom: 4px; }
.info-card__value { font-weight: 500; }
.info-card__value.available { color: var(--accent-primary); }

/* SKILLS */
.skills__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.skill-category { background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 16px; padding: 28px; transition: all var(--transition-base); }
.skill-category:hover { border-color: var(--border-hover); transform: translateY(-4px); }
.skill-category__title { display: flex; align-items: center; gap: 12px; font-size: 1.1rem; font-weight: 600; margin-bottom: 24px; padding-bottom: 16px; border-bottom: 1px solid var(--border-color); }
.skill-category__items { display: flex; flex-wrap: wrap; gap: 12px; }
.skill-item { display: flex; align-items: center; gap: 8px; padding: 10px 16px; background: var(--bg-tertiary); border: 1px solid var(--border-color); border-radius: 8px; font-size: 0.9rem; transition: all var(--transition-base); }
.skill-item:hover { border-color: var(--accent-primary); background: rgba(34, 197, 94, 0.1); transform: translateY(-2px); }
.skill-item i { font-size: 1.25rem; }
.skill-item svg { width: 20px; height: 20px; fill: var(--accent-primary); }

/* PROJECTS */
.projects { background: var(--bg-secondary); }
.projects__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.project-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 16px; overflow: hidden; transition: all var(--transition-base); }
.project-card:hover { border-color: var(--accent-primary); transform: translateY(-8px); box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3); }
.project-card__image { position: relative; height: 200px; background: var(--bg-tertiary); overflow: hidden; }
.project-card__placeholder { display: flex; align-items: center; justify-content: center; height: 100%; background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-card) 100%); }
.project-card__icon { font-size: 4rem; opacity: 0.8; }
.project-card__overlay { position: absolute; inset: 0; background: rgba(10, 10, 11, 0.9); display: flex; align-items: center; justify-content: center; gap: 16px; opacity: 0; transition: opacity var(--transition-base); }
.project-card:hover .project-card__overlay { opacity: 1; }
.project-card__link { display: flex; align-items: center; justify-content: center; width: 48px; height: 48px; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 50%; color: var(--text-primary); text-decoration: none; transition: all var(--transition-fast); }
.project-card__link:hover { background: var(--accent-primary); color: var(--bg-primary); border-color: var(--accent-primary); transform: scale(1.1); }
.project-card__link i { font-size: 1.25rem; }
.project-card__content { padding: 24px; }
.project-card__year { display: inline-block; font-family: var(--font-mono); font-size: 0.75rem; color: var(--accent-primary); margin-bottom: 8px; }
.project-card__title { font-size: 1.25rem; font-weight: 600; margin-bottom: 12px; }
.project-card__description { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 16px; line-height: 1.6; }
.project-card__tech { display: flex; flex-wrap: wrap; gap: 8px; }
.project-card__tech span { padding: 4px 10px; background: var(--bg-tertiary); border: 1px solid var(--border-color); border-radius: 4px; font-size: 0.75rem; font-family: var(--font-mono); color: var(--text-muted); }
.project-card--coming-soon { opacity: 0.6; border-style: dashed; }
.project-card--coming-soon:hover { opacity: 0.8; transform: none; box-shadow: none; }
.projects__cta { display: flex; justify-content: center; margin-top: 48px; }

/* CONTACT */
.contact__content { max-width: 600px; margin: 0 auto; }
.contact__info { display: grid; gap: 16px; }
.contact-card { display: flex; align-items: center; gap: 20px; padding: 24px; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 12px; text-decoration: none; transition: all var(--transition-base); }
.contact-card:hover { border-color: var(--accent-primary); background: rgba(34, 197, 94, 0.05); transform: translateX(8px); }
.contact-card__icon { display: flex; align-items: center; justify-content: center; width: 56px; height: 56px; background: rgba(34, 197, 94, 0.1); border-radius: 12px; color: var(--accent-primary); }
.contact-card__icon i { font-size: 1.5rem; }
.contact-card__icon svg { width: 24px; height: 24px; }
.contact-card__label { display: block; font-size: 0.8rem; color: var(--text-muted); margin-bottom: 4px; }
.contact-card__value { font-weight: 500; color: var(--text-primary); font-size: 1rem; }

/* FOOTER */
.footer { padding: 40px 0; border-top: 1px solid var(--border-color); }
.footer__content { text-align: center; }
.footer__text { color: var(--text-secondary); margin-bottom: 8px; }
.footer__text strong { color: var(--accent-primary); }
.footer__copyright { font-size: 0.85rem; color: var(--text-muted); }

/* BACK TO TOP */
.back-to-top { position: fixed; bottom: 32px; right: 32px; width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px; color: var(--text-primary); text-decoration: none; opacity: 0; visibility: hidden; transition: all var(--transition-base); z-index: 50; }
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--accent-primary); color: var(--bg-primary); border-color: var(--accent-primary); transform: translateY(-4px); }

/* RESPONSIVE */
@media (max-width: 1024px) {
    .hero__content { grid-template-columns: 1fr; text-align: center; }
    .hero__description { margin-left: auto; margin-right: auto; }
    .hero__buttons { justify-content: center; }
    .hero__visual { display: none; }
    .about__content { grid-template-columns: 1fr; }
    .skills__grid { grid-template-columns: 1fr; }
    .projects__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    :root { --section-padding: 80px 0; }
    .nav__menu { position: fixed; top: 72px; left: 0; right: 0; flex-direction: column; background: var(--bg-primary); border-bottom: 1px solid var(--border-color); padding: 24px; gap: 8px; transform: translateY(-100%); opacity: 0; visibility: hidden; transition: all var(--transition-base); }
    .nav__menu.active { transform: translateY(0); opacity: 1; visibility: visible; }
    .nav__link { padding: 12px 16px; }
    .nav__toggle { display: flex; }
    .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); }
    .projects__grid { grid-template-columns: 1fr; }
    .scroll-indicator { display: none; }
}

@media (max-width: 480px) {
    .hero__buttons { flex-direction: column; width: 100%; }
    .btn { width: 100%; justify-content: center; }
}

/* ANIMATIONS */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
.hero__greeting, .hero__name, .hero__title, .hero__description, .hero__buttons { animation: fadeInUp 0.8s ease forwards; }
.hero__greeting { animation-delay: 0.1s; }
.hero__name { animation-delay: 0.2s; }
.hero__title { animation-delay: 0.3s; }
.hero__description { animation-delay: 0.4s; }
.hero__buttons { animation-delay: 0.5s; }
.code-window { animation: fadeInUp 0.8s ease 0.6s forwards; opacity: 0; }
.fade-in { opacity: 0; transform: translateY(30px); transition: all 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* AVAILABILITY BADGE */
.availability-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid var(--accent-primary);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--accent-primary);
    margin-bottom: 20px;
    animation: pulse-badge 2s ease-in-out infinite;
}

.availability-badge__dot {
    width: 8px;
    height: 8px;
    background: var(--accent-primary);
    border-radius: 50%;
    animation: blink 1.5s ease-in-out infinite;
}

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

@keyframes pulse-badge {
    0%, 100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
    50% { box-shadow: 0 0 0 8px rgba(34, 197, 94, 0); }
}