/* ==========================================================================
   Ricardo Leão - Portfolio
   Design system: "Kinetic Logic" (see /DESIGN.md)
   Sophisticated Minimalism: precise geometry, negative space, subtle
   technicality. Motion is restrained and purely functional.
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
  /* Surfaces */
  --color-base: #0a0a0a;
  --color-surface: #121212;
  --color-surface-high: #1a1a1a;
  --color-border: #262626;
  --color-border-strong: #3a3a3a;

  /* Text */
  --color-text: #ffffff;
  --color-text-muted: #a3a3a3;
  --color-text-faint: #6b6b6b;

  /* Accents (functional color-coding, per DESIGN.md) */
  --color-primary: #10b981;
  --color-primary-on: #0a0a0a;
  --color-secondary: #3b82f6;
  --color-secondary-alt: #adc6ff;
  --color-tertiary: #fb7185;

  /* Radii (Shape Consistency Lock, per DESIGN.md) */
  --radius-sm: 0.25rem;   /* buttons, inputs, small cards */
  --radius-lg: 0.5rem;    /* large containers, project cards */
  --radius-tag: 2px;      /* system tags / chips */

  /* Spacing (4px base unit) */
  --space-unit: 4px;
  --stack-sm: 8px;
  --stack-md: 24px;
  --stack-lg: 64px;
  --container-max: 1120px;
  --gutter: 24px;
  --margin-mobile: 16px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  /* Motion */
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 0.2s;
  --duration-base: 0.4s;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

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

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

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

ul {
  list-style: none;
}

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

h1, h2, h3 {
  color: var(--color-text);
  font-weight: 600;
}

/* Respect reduced motion globally */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Layout Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--margin-mobile);
}

@media (min-width: 768px) {
  .container {
    padding-inline: 20px;
  }
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--gutter);
  }
}

.section {
  padding-block: 80px;
  border-top: 1px solid var(--color-border);
}

@media (min-width: 1024px) {
  .section {
    padding-block: 112px;
  }
}

.section-title {
  font-size: clamp(1.75rem, 1.4rem + 1.2vw, 2rem);
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-bottom: var(--stack-lg);
  max-width: 40ch;
}

.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--stack-sm);
}

/* ---------- Skip Link (a11y) ---------- */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: var(--color-primary-on);
  padding: 8px 16px;
  z-index: 100;
  border-radius: 0 0 var(--radius-sm) 0;
  font-weight: 600;
  transition: top var(--duration-fast) var(--ease-standard);
}

.skip-link:focus {
  top: 0;
}

/* Visible focus states (a11y, non-negotiable) */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9375rem;
  white-space: nowrap;
  transition: transform var(--duration-fast) var(--ease-standard),
              background-color var(--duration-fast) var(--ease-standard),
              border-color var(--duration-fast) var(--ease-standard);
}

.btn i {
  font-size: 1.1em;
}

.btn:active {
  transform: scale(0.98);
}

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

.btn--primary:hover {
  background: #14ce93;
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
}

.btn--secondary:hover {
  border-color: var(--color-secondary);
}

.btn--sm {
  padding: 9px 18px;
  font-size: 0.875rem;
}

/* ---------- Header / Nav ---------- */
.scroll-sentinel {
  position: absolute;
  top: 0;
  height: 1px;
  width: 1px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  background: rgba(10, 10, 10, 0);
  transition: background-color var(--duration-base) var(--ease-standard),
              border-color var(--duration-base) var(--ease-standard);
}

.site-header.is-scrolled {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.brand__dot {
  color: var(--color-primary);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--duration-fast) var(--ease-standard);
  position: relative;
}

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

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

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--color-text);
  line-height: 0;
}

@media (max-width: 1023px) {
  .nav {
    position: fixed;
    inset: 72px 0 0 0;
    background: var(--color-base);
    padding: 32px var(--margin-mobile);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--duration-base) var(--ease-standard),
                transform var(--duration-base) var(--ease-standard),
                visibility var(--duration-base);
  }

  .nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  .nav__link {
    display: block;
    width: 100%;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 1.0625rem;
  }

  .nav-toggle {
    display: block;
  }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  display: flex;
  align-items: flex-start;
  /* Preenche a 1ª tela sem cortar o conteúdo (min, não max) */
  min-height: calc(100svh - 72px);
  padding-top: clamp(2.5rem, 8vh, 5rem);
  padding-bottom: clamp(2rem, 5vh, 4rem);
  overflow-x: clip;
  overflow-y: visible;
}

.hero__grid {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.25;
  mask-image: linear-gradient(to bottom, black, transparent 85%);
  -webkit-mask-image: linear-gradient(to bottom, black, transparent 85%);
  pointer-events: none;
}

.hero__glow {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 640px;
  height: 640px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.16), transparent 70%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  max-width: 760px;
  width: 100%;
}

.hero__content .eyebrow {
  margin-bottom: 12px;
}

.hero__headline {
  font-size: clamp(2.25rem, 1.6rem + 3vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero__subtext {
  font-size: 1.0625rem;
  line-height: 1.6;
  max-width: 58ch;
  margin-bottom: 28px;
}

.cert-badge {
  display: inline-block;
  margin-bottom: 28px;
  transition: transform var(--duration-fast) var(--ease-standard),
              opacity var(--duration-fast) var(--ease-standard);
}

.cert-badge:hover {
  transform: translateY(-2px);
  opacity: 0.92;
}

.cert-badge img {
  display: block;
  width: 96px;
  height: auto;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.45));
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

@supports not (height: 100svh) {
  .hero {
    min-height: calc(100vh - 72px);
  }
}

/* ---------- Tech Stack Grid ---------- */
.tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gutter);
}

@media (min-width: 640px) {
  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .tech-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.tech-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 2px solid var(--accent, var(--color-primary));
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: background-color var(--duration-fast) var(--ease-standard),
              border-color var(--duration-fast) var(--ease-standard);
}

.tech-card:hover {
  background: var(--color-surface-high);
}

.tech-card__icon {
  font-size: 1.75rem;
  color: var(--accent, var(--color-primary));
  margin-bottom: var(--stack-md);
}

.tech-card__title {
  font-size: 1.125rem;
  margin-bottom: var(--stack-md);
}

.tech-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--stack-md);
}

.tech-card__list li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: var(--stack-sm);
  border-top: 1px solid var(--color-border);
}

.tech-card__list li:first-child {
  padding-top: 0;
  border-top: none;
}

.tech-card__list strong {
  color: var(--color-text);
  font-size: 0.9375rem;
  font-weight: 600;
}

.tech-card__list span {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ---------- Tags & Chips ---------- */
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-surface-high);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-tag);
  padding: 4px 10px;
  margin-bottom: var(--stack-sm);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-block: var(--stack-md) var(--stack-sm);
}

.chip {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  background: var(--color-surface-high);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-tag);
  padding: 4px 10px;
}

/* ---------- Projects ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gutter);
}

@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color var(--duration-fast) var(--ease-standard);
}

.project-card:hover {
  border-color: var(--color-border-strong);
}

.project-card--featured {
  grid-column: 1 / -1;
}

.project-card--secondary {
  opacity: 0.92;
}

.project-card--secondary .project-card__title {
  font-size: 1.0625rem;
}

.project-card--secondary .project-card__desc {
  font-size: 0.875rem;
}

.project-card__media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-high);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-card__media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.6s var(--ease-standard);
}

.project-card:hover .project-card__media img {
  transform: scale(1.04);
}

.project-card__body {
  padding: 32px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-card__title {
  font-size: 1.25rem;
  margin-bottom: 12px;
  line-height: 1.3;
}

.project-card__desc {
  font-size: 0.9375rem;
  max-width: 60ch;
  margin-bottom: auto;
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  margin-top: var(--stack-md);
  transition: gap var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
}

.project-card__link i {
  transition: transform var(--duration-fast) var(--ease-standard);
}

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

.project-card__link:hover i {
  transform: translate(2px, -2px);
}

@media (min-width: 768px) {
  .project-card--featured {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
  }

  .project-card--featured .project-card__media {
    aspect-ratio: auto;
    border-bottom: none;
    border-right: 1px solid var(--color-border);
    min-height: 100%;
  }

  .project-card--featured .project-card__body {
    padding: 40px;
  }
}

/* ---------- About ---------- */
.about {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--stack-lg);
  align-items: start;
}

@media (min-width: 768px) {
  .about {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 56px;
    align-items: center;
  }
}

.about__photo {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  max-width: 420px;
}

.about__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.15) contrast(1.05);
}

.about__content .section-title {
  margin-bottom: var(--stack-lg);
}

.about__text {
  max-width: 60ch;
  margin-bottom: var(--stack-md);
  font-size: 1rem;
}

.about__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: var(--stack-lg);
  margin-bottom: var(--stack-md);
  font-size: 0.9375rem;
}

.about__meta-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color var(--duration-fast) var(--ease-standard);
}

a.about__meta-item:hover {
  color: var(--color-primary);
}

.about__socials {
  display: flex;
  gap: 16px;
  font-size: 1.375rem;
}

.about__socials a {
  color: var(--color-text-muted);
  transition: color var(--duration-fast) var(--ease-standard);
}

.about__socials a:hover {
  color: var(--color-primary);
}

/* ---------- Formation ---------- */
.formation-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

@media (min-width: 640px) {
  .formation-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .formation-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.formation-card {
  background: var(--color-surface);
  padding: 24px 28px;
  transition: background-color var(--duration-fast) var(--ease-standard);
}

.formation-card:hover {
  background: var(--color-surface-high);
}

.formation-card--featured {
  display: flex;
  align-items: center;
  gap: 16px;
  border-left: 3px solid var(--color-primary);
  background: var(--color-surface-high);
}

.formation-card__badge {
  flex-shrink: 0;
  width: 64px;
  height: auto;
  display: block;
}

.formation-card__badge-link {
  flex-shrink: 0;
  transition: opacity var(--duration-fast) var(--ease-standard);
}

.formation-card__badge-link:hover {
  opacity: 0.85;
}

.formation-card__content {
  min-width: 0;
}

.formation-card__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.formation-card__title {
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
}

.formation-card__title span {
  color: var(--color-text-muted);
  font-weight: 400;
  font-size: 0.875rem;
}

.credential-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 10px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--duration-fast) var(--ease-standard);
}

.credential-link i {
  font-size: 0.875rem;
}

.credential-link:hover {
  color: var(--color-primary);
}

.credential-link--muted {
  display: flex;
  margin-top: 6px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--color-text-faint);
  word-break: break-all;
}

.credential-link--muted:hover {
  color: var(--color-secondary);
}

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

.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-faint);
}

@media (min-width: 640px) {
  .site-footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.site-footer__socials {
  display: flex;
  gap: 24px;
}

.site-footer__socials a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-faint);
  transition: color var(--duration-fast) var(--ease-standard);
}

.site-footer__socials a:hover {
  color: var(--color-primary);
}

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-base) var(--ease-standard),
              transform var(--duration-base) var(--ease-standard);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}