/* ================================================================
   HUGO FILIPE COSTA — Design System v2
   Protocol Theory-inspired editorial aesthetic
   ================================================================

   TABLE OF CONTENTS
   ─────────────────
   01. Design Tokens
   02. Reset & Base
   03. Layout
   04. Navigation
   05. Hero
   06. Marquee
   07. Stats
   08. Projects
   09. About
   10. Experience
   11. Mentorship
   12. Other Projects / Archive
   13. Contact + Form
   14. Footer
   15. Utilities & Animations
   16. Responsive

   ================================================================ */


/* ================================================================
   01. DESIGN TOKENS
   ================================================================ */

:root {
  /* Colour */
  --bg:           #0c0c0c;
  --bg-1:         #111111;
  --bg-2:         #161616;
  --bg-3:         #1c1c1c;

  --text:         #f0ede8;
  --text-2:       #c8c5bf;
  --text-3:       #a8a5a0;
  --text-4:       #6b6864;
  --text-muted:   #fde3d2;

  --accent:       #ff6f03;
  --accent-dim:   rgba(255, 111, 3, 0.10);
  --accent-border:rgba(255, 111, 3, 0.22);

  --border:       rgba(255, 255, 255, 0.07);
  --border-2:     rgba(255, 255, 255, 0.13);

  /* Typography */
  --font:         'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Pangea', 'Pangea Display', 'Inter', -apple-system, sans-serif;
  --mono:         'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  /* Type scale */
  --text-xs:   0.6875rem;   /* 11px */
  --text-sm:   0.8125rem;   /* 13px */
  --text-base: 1rem;        /* 16px */
  --text-md:   1.125rem;    /* 18px */
  --text-lg:   1.375rem;    /* 22px */
  --text-xl:   1.75rem;     /* 28px */
  --text-2xl:  2.25rem;     /* 36px */
  --text-3xl:  3rem;        /* 48px */
  --text-4xl:  4.5rem;      /* 72px */
  --text-5xl:  7rem;        /* 112px */

  /* Layout */
  --container:   1160px;
  --gutter:      clamp(20px, 4vw, 48px);
  --nav-h:       88px;
  --radius-sm:   6px;
  --radius-md:   12px;
  --radius-lg:   20px;

  /* Motion */
  --ease:        cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast:    150ms;
  --dur-base:    260ms;
  --dur-slow:    420ms;
}


/* ================================================================
   02. RESET & BASE
   ================================================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: var(--text-base);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
ul, ol { list-style: none; }

::selection { background: var(--accent); color: #fff; }

::-webkit-scrollbar { width: 3px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 2px; }


/* ================================================================
   03. LAYOUT
   ================================================================ */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Section label — mono code-block style */
.code-label {
  display: inline-flex;
  align-items: center;
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  padding: 3px 10px;
  border-radius: 3px;
  margin-bottom: 28px;
}

/* Section header row — ↘ Title pattern */
.section-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 16px;
}

.section-arrow {
  font-size: var(--text-xl);
  color: var(--accent);
  line-height: 1;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(var(--text-2xl), 3.5vw, var(--text-3xl));
  font-weight: 300;
  color: var(--text);
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.section-divider {
  width: 100%;
  height: 1px;
  background: var(--border);
  margin-bottom: 56px;
}


/* ================================================================
   04. NAVIGATION
   ================================================================ */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background var(--dur-base) var(--ease),
              border-color var(--dur-base) var(--ease);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(12, 12, 12, 0.9);
  border-color: var(--border);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.nav > .container {
  height: 100%;
}

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

/* Logo */
.nav__logo img {
  height: 28px;
  width: auto;
}

/* Desktop links */
.nav__links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav__links a {
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--text-3);
  position: relative;
  transition: color var(--dur-fast) var(--ease);
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0; right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease);
}

.nav__links a:hover        { color: var(--text); }
.nav__links a:hover::after { transform: scaleX(1); }

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text);
  transition: transform var(--dur-base) var(--ease),
              opacity var(--dur-fast) var(--ease);
}

.nav__hamburger.active span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__hamburger.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav__hamburger.active span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile drawer */
.nav__mobile {
  display: none;
  position: fixed;
  inset: 0;
  top: var(--nav-h);
  background: var(--bg);
  z-index: 99;
  padding: 40px var(--gutter);
  flex-direction: column;
  gap: 0;
}

.nav__mobile.open { display: flex; }

.nav__mobile a {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 300;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-block: 22px;
  transition: color var(--dur-fast);
}

.nav__mobile a:first-child { border-top: 1px solid var(--border); }
.nav__mobile a:hover       { color: var(--accent); }


/* ================================================================
   05. HERO
   ================================================================ */

.hero {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding-top: var(--nav-h);
  padding-bottom: 96px;
  position: relative;
  overflow: hidden;
}

/* Background video */
.hero__bg-video {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.hero__bg-video video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.12;
}

/* Gradient veil over video */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(to bottom, rgba(12,12,12,0.4) 0%, transparent 40%, rgba(12,12,12,0.85) 100%),
    radial-gradient(ellipse 65% 55% at 60% 30%, rgba(255,111,3,0.06), transparent 65%);
}

.hero > .container {
  position: relative;
  z-index: 2;
}

.hero__content {
  max-width: 820px;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(52px, 8.5vw, 120px);
  font-weight: 300;
  line-height: 1.03;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 28px;
}

.hero__title em {
  font-style: normal;
  color: var(--text-muted);
}

.hero__sub {
  font-size: clamp(var(--text-base), 1.4vw, var(--text-md));
  color: var(--text-3);
  line-height: 1.7;
  max-width: 540px;
  margin-bottom: 40px;
}

.hero__sub strong { color: var(--text-2); font-weight: 500; }

.hero__cta-row {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--text-sm);
  letter-spacing: 0.03em;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
  transition: background var(--dur-base) var(--ease),
              color var(--dur-base) var(--ease);
}

.btn-primary:hover {
  background: transparent;
  color: var(--accent);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--text-sm);
  letter-spacing: 0.03em;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-3);
  border: 1px solid var(--border-2);
  transition: border-color var(--dur-base) var(--ease),
              color var(--dur-base) var(--ease);
}

.btn-ghost:hover {
  border-color: var(--text-3);
  color: var(--text);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  padding: 9px 20px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-3);
  border: 1px solid var(--border-2);
  transition: border-color var(--dur-base), color var(--dur-base);
}

.btn-outline:hover {
  border-color: var(--text-4);
  color: var(--text);
}


/* ================================================================
   06. MARQUEE
   ================================================================ */

.marquee-wrap {
  overflow: hidden;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding-block: 14px;
  background: var(--bg-1);
}

.marquee-track {
  display: flex;
  gap: 0;
  width: max-content;
  animation: marquee 28s linear infinite;
}

.marquee-track:hover { animation-play-state: paused; }

.marquee-item {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-4);
  white-space: nowrap;
  padding-inline: 20px;
}

.marquee-item .dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.6;
  display: inline-block;
}


/* ================================================================
   07. STATS
   ================================================================ */

.stats {
  padding-block: 80px;
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.stat {
  background: var(--bg-1);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stat__number {
  font-family: var(--font-display);
  font-size: clamp(var(--text-3xl), 5vw, var(--text-4xl));
  font-weight: 300;
  color: var(--text);
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat__desc {
  font-size: var(--text-sm);
  color: var(--text-3);
  line-height: 1.55;
}


/* ================================================================
   08. PROJECTS
   ================================================================ */

.projects {
  padding-block: 96px;
  background: var(--bg-1);
}

.projects__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 0;
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

/* Project card */
.project-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color var(--dur-base) var(--ease),
              transform var(--dur-slow) var(--ease);
}

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

.project-card__index {
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--accent);
  display: block;
}

.project-card__name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 300;
  color: var(--text);
  line-height: 1.2;
}

.project-card__desc {
  font-size: var(--text-sm);
  color: var(--text-3);
  line-height: 1.65;
  flex: 1;
}

.project-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  padding-top: 16px;
  border-top: 1px solid var(--border);
  margin-top: auto;
  transition: color var(--dur-fast);
}

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


/* ================================================================
   09. ABOUT
   ================================================================ */

.about {
  padding-block: 96px;
}

.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about__text {
  font-size: var(--text-md);
  color: var(--text-3);
  line-height: 1.75;
  margin-bottom: 20px;
}

.about__text strong { color: var(--text-2); font-weight: 500; }

.about__lists {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.about__lists > div {
  border-top: 1px solid var(--border);
  padding-top: 20px;
}

.about__list-title {
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
  display: block;
}

.about__list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  list-style: none;
}

.about__list li {
  font-size: var(--text-sm);
  color: var(--text-3);
  padding-left: 18px;
  position: relative;
}

.about__list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--text-4);
  font-size: 0.65rem;
  top: 1px;
}


/* ================================================================
   10. EXPERIENCE
   ================================================================ */

.experience {
  padding-block: 96px;
  background: var(--bg-1);
}

.experience__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 0;
}

/* Current role highlight */
.experience__current {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  margin-bottom: 40px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.experience__current::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  animation: pulse 2.5s ease-in-out infinite;
}

.experience__current-text strong {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--text);
  display: block;
  margin-bottom: 6px;
}

.experience__current-text strong a {
  color: var(--accent);
}

.experience__current-text strong a:hover {
  text-decoration: underline;
}

.experience__current-text span {
  font-size: var(--text-sm);
  color: var(--text-3);
}

/* Timeline */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.timeline-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 40px;
  padding-block: 36px;
  border-top: 1px solid var(--border);
}

.timeline-item:last-child { border-bottom: 1px solid var(--border); }

.timeline-item__period {
  padding-top: 4px;
  flex-shrink: 0;
}

.timeline-item__period span {
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
}

.timeline-item__role {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 300;
  color: var(--text);
  margin-bottom: 4px;
  line-height: 1.2;
}

.timeline-item__company {
  font-size: var(--text-sm);
  color: var(--text-3);
  margin-bottom: 16px;
}

.timeline-item__bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.timeline-item__bullets li {
  font-size: var(--text-sm);
  color: var(--text-4);
  line-height: 1.6;
  padding-left: 18px;
  position: relative;
}

.timeline-item__bullets li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-4);
  font-size: 0.65rem;
  top: 2px;
}


/* ================================================================
   11. MENTORSHIP
   ================================================================ */

.mentorship {
  padding-block: 96px;
}

.mentorship__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.mentorship__title {
  font-family: var(--font-display);
  font-size: clamp(var(--text-2xl), 3vw, var(--text-3xl));
  font-weight: 300;
  color: var(--text);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 20px;
}

.mentorship__text {
  font-size: var(--text-base);
  color: var(--text-3);
  line-height: 1.75;
  margin-bottom: 28px;
}

.mentorship__btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--text-sm);
  letter-spacing: 0.03em;
  padding: 11px 24px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-3);
  border: 1px solid var(--border-2);
  transition: border-color var(--dur-base), color var(--dur-base);
}

.mentorship__btn:hover {
  border-color: var(--text-3);
  color: var(--text);
}

.mentorship__card {
  display: block;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: border-color var(--dur-base);
}

.mentorship__card:hover { border-color: var(--border-2); }

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

.mentorship__card-platform {
  display: block;
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-4);
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-1);
}


/* ================================================================
   12. OTHER PROJECTS / ARCHIVE
   ================================================================ */

.other-projects {
  padding-block: 96px;
  background: var(--bg-1);
}

.other-projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 48px;
}

/* Other card */
.other-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color var(--dur-base) var(--ease);
}

.other-card:hover { border-color: var(--border-2); }

.other-card__meta {
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.other-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--text);
  line-height: 1.25;
}

.other-card__desc {
  font-size: var(--text-sm);
  color: var(--text-3);
  line-height: 1.65;
  flex: 1;
}

.other-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-top: auto;
  transition: color var(--dur-fast);
}

.other-card__link:hover { color: var(--accent); }

/* Archive list */
.other-projects__archive {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.archive-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: start;
  padding-block: 24px;
  border-bottom: 1px solid var(--border);
}

.archive-card:first-child { border-top: 1px solid var(--border); }

.archive-card__meta {
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
  display: block;
}

.archive-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--text);
  line-height: 1.25;
  margin-bottom: 6px;
}

.archive-card__desc {
  font-size: var(--text-sm);
  color: var(--text-4);
  line-height: 1.6;
}


/* ================================================================
   13. CONTACT + FORM
   ================================================================ */

.contact {
  padding-block: 96px;
}

.contact__headline {
  font-family: var(--font-display);
  font-size: clamp(var(--text-3xl), 6vw, var(--text-5xl));
  font-weight: 300;
  color: var(--text);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-bottom: 72px;
  max-width: 860px;
}

.contact__headline em {
  font-style: normal;
  color: var(--text-muted);
}

.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

/* Channels */
.contact__channels {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 28px;
}

.contact__channel {
  display: grid;
  grid-template-columns: 110px 1fr 20px;
  align-items: center;
  gap: 20px;
  padding-block: 18px;
  border-bottom: 1px solid var(--border);
  transition: opacity var(--dur-fast);
}

.contact__channel:first-child { border-top: 1px solid var(--border); }
.contact__channel:hover        { opacity: 0.7; }

.contact__channel-label {
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-4);
}

.contact__channel-value {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--text);
}

.contact__channel-arrow {
  color: var(--accent);
  font-size: 1.1rem;
}

/* Contact form */
.contact__form {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 28px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-4);
}

.form-group input,
.form-group textarea {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-family: var(--font);
  font-size: var(--text-sm);
  color: var(--text);
  outline: none;
  transition: border-color var(--dur-base);
  resize: none;
  width: 100%;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-4);
}

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

.form-group textarea {
  min-height: 140px;
}

.form-message {
  font-size: var(--text-sm);
  color: var(--text-3);
  min-height: 20px;
}

.form-message.success { color: #7bcf72; }
.form-message.error   { color: #ff6b6b; }

.form-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  padding: 13px 28px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #fff;
  border: 1px solid var(--accent);
  cursor: pointer;
  transition: background var(--dur-base) var(--ease),
              color var(--dur-base) var(--ease);
  align-self: flex-start;
}

.form-submit:hover {
  background: transparent;
  color: var(--accent);
}


/* ================================================================
   14. FOOTER
   ================================================================ */

footer {
  background: var(--bg-1);
  border-top: 1px solid var(--border);
  padding-block: 28px;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer__copy {
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--text-4);
}

.footer__back-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-4);
  cursor: pointer;
  transition: color var(--dur-fast);
}

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


/* ================================================================
   15. UTILITIES & ANIMATIONS
   ================================================================ */

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-slow) var(--ease),
              transform var(--dur-slow) var(--ease);
}

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

/* Staggered children */
.stagger > .reveal:nth-child(1)  { transition-delay: 0ms; }
.stagger > .reveal:nth-child(2)  { transition-delay: 80ms; }
.stagger > .reveal:nth-child(3)  { transition-delay: 160ms; }
.stagger > .reveal:nth-child(4)  { transition-delay: 240ms; }
.stagger > .reveal:nth-child(5)  { transition-delay: 320ms; }
.stagger > .reveal:nth-child(6)  { transition-delay: 400ms; }

/* Keyframes */
@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

@keyframes pulse {
  0%, 100% { opacity: 1;   transform: scale(1);   }
  50%       { opacity: 0.3; transform: scale(0.65); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0);    }
}


/* ================================================================
   16. RESPONSIVE
   ================================================================ */

@media (max-width: 1024px) {
  .about__inner     { grid-template-columns: 1fr; gap: 48px; }
  .mentorship__inner{ grid-template-columns: 1fr; }
  .contact__inner   { grid-template-columns: 1fr; gap: 48px; }
}

@media (max-width: 900px) {
  .stats__grid    { grid-template-columns: repeat(2, 1fr); }
  .projects__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --nav-h: 70px; }

  .nav__links     { display: none; }
  .nav__hamburger { display: flex; }

  .hero__title  { font-size: clamp(40px, 10.5vw, 72px); }
  .hero         { padding-bottom: 64px; }

  .stats    { padding-block: 56px; }
  .projects,
  .about,
  .experience,
  .mentorship,
  .other-projects,
  .contact  { padding-block: 72px; }

  .stats__grid    { grid-template-columns: repeat(2, 1fr); }
  .projects__grid { grid-template-columns: 1fr; }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .other-projects__grid { grid-template-columns: 1fr; }

  .contact__channel {
    grid-template-columns: 90px 1fr 20px;
    gap: 14px;
  }

  .contact__channel-value { font-size: var(--text-base); }

  .footer__inner { flex-direction: column; align-items: flex-start; gap: 12px; }

  .experience__header { flex-direction: column; gap: 16px; }
  .experience__current { flex-direction: column; gap: 12px; }
  .experience__current::before { display: none; }
}

@media (max-width: 480px) {
  .hero__title { font-size: clamp(36px, 11vw, 54px); }
  .stats__grid { grid-template-columns: 1fr 1fr; }
  .contact__headline { font-size: clamp(var(--text-2xl), 8vw, var(--text-3xl)); }
}