/* ============================================
   TechWave Consulting — Holding Page
   BEM methodology · CSS Custom Properties · Mobile-first
   ============================================ */

/* ── Design Tokens ──────────────────────── */
:root {
  --color-bg: #0B0C0E;
  --color-surface: #111318;
  --color-surface-raised: #181B22;
  --color-accent: #5BA8E0;
  --color-accent-glow: rgba(91, 168, 224, 0.14);
  --color-text-primary: #F2F3F5;
  --color-text-secondary: #C2C8D4;
  --color-text-muted: #7A8194;
  --color-rule: rgba(255, 255, 255, 0.08);
  --color-border: rgba(255, 255, 255, 0.06);

  --font-display: 'Inter', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'DM Mono', monospace;

  --header-height: 4rem;
  --container-max: 1200px;
  --container-gutter: 1.5rem;
}

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

/* ── Base ───────────────────────────────── */
html {
  scroll-behavior: smooth;
  scroll-padding-block-start: var(--header-height);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.94rem + 0.3vw, 1.0625rem);
  line-height: 1.65;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Typography Rhythm ──────────────────── */
h1 {
  margin-block-end: 1.5rem;
}

h2 {
  margin-block-start: 3rem;
  margin-block-end: 1.25rem;
}

p {
  margin-block-end: 1.25rem;
  line-height: 1.65;
  max-inline-size: 70ch;
}

/* ── Section Spacing ────────────────────── */
section {
  padding-block: clamp(2.5rem, 5vw, 4rem);
}

/* ── Container ──────────────────────────── */
.container {
  max-inline-size: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-gutter);
}

/* ── Focus States ───────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* ── Links Base ─────────────────────────── */
a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

/* ============================================
   HEADER
   ============================================ */
.header {
  position: sticky;
  inset-block-start: 0;
  z-index: 100;
  background-color: var(--color-bg);
  block-size: var(--header-height);
  border-block-end: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.header--scrolled {
  border-block-end-color: var(--color-rule);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  block-size: 100%;
}

.header__wordmark {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text-primary);
  letter-spacing: 0.01em;
}

/* ── Desktop Nav ────────────────────────── */
.header__nav {
  display: none;
}

.header__nav-list {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.header__nav-link {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.header__nav-link:hover,
.header__nav-link:focus-visible {
  color: var(--color-accent);
}

.header__nav-btn {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #fff;
  background-color: var(--color-accent);
  padding: 0.5rem 1.25rem;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.header__nav-btn:hover,
.header__nav-btn:focus-visible {
  background-color: #79BBE8;
  color: #fff;
}

/* ── Hamburger ──────────────────────────── */
.header__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  inline-size: 2.5rem;
  block-size: 2.5rem;
}

.header__toggle-bar {
  display: block;
  inline-size: 100%;
  block-size: 2px;
  background-color: var(--color-text-primary);
  border-radius: 1px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.header__toggle[aria-expanded="true"] .header__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile Overlay ─────────────────────── */
.header__overlay {
  position: fixed;
  inset: 0;
  z-index: 99;
  background-color: rgba(11, 12, 14, 0.98);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.header__overlay--open {
  opacity: 1;
  visibility: visible;
}

.header__overlay-nav {
  list-style: none;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.header__overlay-link {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.75rem;
  color: var(--color-text-primary);
}

.header__overlay-link:hover,
.header__overlay-link:focus-visible {
  color: var(--color-accent);
}

/* ============================================
   HERO
   ============================================ */
.hero {
  padding-block-start: clamp(3rem, 8vw, 6rem);
  padding-block-end: clamp(2.5rem, 5vw, 4rem);
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 10% 40%, var(--color-accent-glow), transparent);
  pointer-events: none;
}

.hero__label {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-block-end: 1.5rem;
}

.hero__label::before {
  content: '';
  display: inline-block;
  inline-size: 2rem;
  block-size: 2px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

.hero__headline {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 1.4rem + 3vw, 3.25rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  max-inline-size: 20ch;
  margin-block-end: 1.5rem;
}

.hero__body {
  font-size: clamp(1rem, 0.94rem + 0.3vw, 1.125rem);
  color: var(--color-text-secondary);
  max-inline-size: 55ch;
  line-height: 1.7;
}

/* ============================================
   ABOUT
   ============================================ */
.about {
  background-color: var(--color-surface);
  border-block: 1px solid var(--color-border);
}

.about__label {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-block-end: 1.5rem;
}

.about__label::before {
  content: '';
  display: inline-block;
  inline-size: 2rem;
  block-size: 2px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

.about__body {
  font-size: clamp(0.9375rem, 0.9rem + 0.2vw, 1rem);
  color: var(--color-text-secondary);
  max-inline-size: 60ch;
  line-height: 1.7;
}

/* ============================================
   PORTFOLIO
   ============================================ */
.portfolio__label {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-block-end: 2rem;
}

.portfolio__label::before {
  content: '';
  display: inline-block;
  inline-size: 2rem;
  block-size: 2px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

.portfolio__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.portfolio__card {
  display: flex;
  flex-direction: column;
  padding: 1.75rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  transition: border-color 0.25s ease, background-color 0.25s ease, transform 0.25s ease;
}

.portfolio__card:hover {
  border-color: rgba(91, 168, 224, 0.3);
  background-color: var(--color-surface-raised);
  transform: translateY(-2px);
}

.portfolio__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  inline-size: 2.75rem;
  block-size: 2.75rem;
  background-color: var(--color-accent-glow);
  border-radius: 10px;
  color: var(--color-accent);
  margin-block-end: 1.25rem;
}

.portfolio__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.125rem, 1rem + 0.5vw, 1.25rem);
  color: var(--color-text-primary);
  margin-block-end: 0.5rem;
}

.portfolio__desc {
  font-size: clamp(0.875rem, 0.85rem + 0.15vw, 0.9375rem);
  color: var(--color-text-secondary);
  margin-block-end: 1.25rem;
  line-height: 1.5;
  flex-grow: 1;
}

.portfolio__link {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

.portfolio__card:hover .portfolio__link {
  color: var(--color-accent);
}

.portfolio__arrow {
  color: var(--color-accent);
  margin-inline-start: 0.25rem;
  transition: margin-inline-start 0.2s ease;
}

.portfolio__card:hover .portfolio__arrow {
  margin-inline-start: 0.5rem;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  padding-block: 2.5rem;
  background-color: var(--color-surface);
  border-block-start: 1px solid var(--color-border);
}

.footer__rule {
  display: none;
}

.footer__email {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-primary);
  margin-block-end: 0.75rem;
}

.footer__email:hover,
.footer__email:focus-visible {
  color: var(--color-accent);
}

.footer__legal {
  margin-block-end: 1.25rem;
}

.footer__legal-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  list-style: none;
}

.footer__legal-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

.footer__legal-link:hover,
.footer__legal-link:focus-visible {
  color: var(--color-accent);
}

.footer__copy {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* ============================================
   RESPONSIVE — Desktop (min-width: 768px)
   ============================================ */
@media (min-width: 768px) {
  .header__toggle {
    display: none;
  }

  .header__nav {
    display: block;
  }

  .portfolio__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
}