/* css/main.css */

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
ul { list-style: none; }

/* ── Base ── */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-on-light);
  background: var(--color-bg-light);
  -webkit-font-smoothing: antialiased;
  padding-top: var(--nav-height);
}

/* ── Grain overlay ── */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

/* ── Layout helpers ── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
}

.section {
  padding-block: var(--section-py);
}

/* ── Typography helpers ── */
.label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-muted-light);
}

.label--light {
  color: var(--color-text-muted-dark);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-6);
  border: 1.5px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: background var(--ease-fast), color var(--ease-fast), border-color var(--ease-fast);
  white-space: nowrap;
}

.btn--cobalt {
  background: var(--color-cobalt);
  color: #fff;
}
.btn--cobalt:hover { background: var(--color-cobalt-hover); }

.btn--outline-light {
  border: 1.5px solid var(--color-text-on-dark);
  color: var(--color-text-on-dark);
}
.btn--outline-light:hover {
  background: rgba(255,255,255,0.08);
}

.btn--emerald {
  background: var(--color-emerald);
  color: #fff;
}
.btn--emerald:hover { background: var(--color-emerald-hover); }

/* ── Navigation ── */
#nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(244, 241, 236, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease-base), background var(--ease-base);
}

#nav.scrolled {
  border-color: var(--color-border-light);
}

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

.nav__logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-lg);
  letter-spacing: -0.03em;
  color: var(--color-text-on-light);
  transition: color var(--ease-fast);
}
.nav__logo:hover { color: var(--color-cobalt); }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted-light);
  transition: color var(--ease-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-cobalt);
  transition: width var(--ease-base);
}

.nav__link:hover,
.nav__link.active { color: var(--color-text-on-light); }
.nav__link:hover::after,
.nav__link.active::after { width: 100%; }

.nav__link--cta {
  background: var(--color-cobalt);
  color: #fff !important;
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
}
.nav__link--cta::after { display: none; }
.nav__link--cta:hover { background: var(--color-cobalt-hover); }

/* Mobile nav toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--sp-2);
}
.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-on-light);
  transition: transform var(--ease-base), opacity var(--ease-base);
}
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 720px) {
  .nav__toggle { display: flex; }
  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-bg-light);
    border-bottom: 1px solid var(--color-border-light);
    padding: var(--sp-4) 0;
  }
  .nav__links.open { display: flex; }
  .nav__link { padding: var(--sp-3) clamp(1.25rem, 5vw, 3rem); }
  .nav__link--cta {
    margin: var(--sp-3) clamp(1.25rem, 5vw, 3rem);
    text-align: center;
    display: block;
  }
}

/* ── Hero ── */
#hero {
  background: var(--color-bg-dark);
  padding-block: clamp(5rem, 12vw, 10rem);
  position: relative;
  overflow: hidden;
}

/* Subtle cobalt glow top-right */
#hero::before {
  content: '';
  position: absolute;
  top: -10%;
  right: -5%;
  width: clamp(300px, 50vw, 600px);
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(26,79,214,0.18) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
}

.hero__eyebrow {
  color: var(--color-text-muted-dark);
  margin-bottom: var(--sp-6);
}

.hero__headline {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--color-text-on-dark);
  margin-bottom: var(--sp-6);
}

.hero__headline--accent {
  color: var(--color-cobalt);
}

.hero__sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted-dark);
  max-width: 560px;
  line-height: 1.65;
  margin-bottom: var(--sp-8);
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
}

/* ── About ── */
#about {
  background: var(--color-bg-light);
}

.about__inner {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-16);
}

.about__text {
  flex: 1;
}

.about__label {
  margin-bottom: var(--sp-6);
}

.about__bio {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-text-on-light);
  margin-bottom: var(--sp-4);
  max-width: 620px;
}

.about__beliefs {
  margin-top: var(--sp-8);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.about__beliefs li {
  font-size: var(--text-base);
  color: var(--color-text-muted-light);
  padding-left: var(--sp-6);
  position: relative;
}

.about__beliefs li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-cobalt);
  font-weight: 600;
}

.about__photo-wrap {
  flex-shrink: 0;
  padding-top: var(--sp-12);
}

.about__photo {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-full);
  object-fit: cover;
  object-position: center 30%;
  border: 3px solid var(--color-border-light);
}

@media (max-width: 600px) {
  .about__inner {
    flex-direction: column-reverse;
    gap: var(--sp-6);
  }
  .about__photo-wrap { padding-top: 0; }
}

/* ── Impact ── */
#impact {
  background: var(--color-bg-white);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.impact__label {
  margin-bottom: var(--sp-8);
}

.impact__grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--sp-1);
}

@media (max-width: 900px) {
  .impact__grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 560px) {
  .impact__grid { grid-template-columns: repeat(2, 1fr); }
}

.impact__item {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  padding: var(--sp-8) var(--sp-6);
  border-left: 3px solid var(--color-border-light);
  transition: border-color var(--ease-base);
}

.impact__item:hover {
  border-color: var(--color-cobalt);
}

.impact__number {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--color-text-on-light);
}

.impact__unit {
  font-size: var(--text-2xl);
  color: var(--color-cobalt);
}

.impact__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted-light);
  max-width: 160px;
  line-height: 1.4;
}

.impact__note {
  margin-top: var(--sp-8);
  font-size: var(--text-xs);
  color: var(--color-text-muted-light);
  font-style: italic;
}

/* ── Prototypes (Emerald Zone) ── */
#prototypes {
  background: var(--color-emerald-bg);
}

.prototypes__header {
  margin-bottom: var(--sp-12);
}

.prototypes__heading {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text-on-dark);
  line-height: 1.1;
  margin-top: var(--sp-4);
  margin-bottom: var(--sp-4);
}

.prototypes__sub {
  font-size: var(--text-base);
  color: var(--color-text-muted-dark);
}

.prototypes__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--sp-4);
}

.prototype-card__link {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(26,158,106,0.2);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--ease-base), transform var(--ease-base), background var(--ease-base);
  text-decoration: none;
}

.prototype-card__link:hover {
  border-color: var(--color-emerald);
  background: rgba(255,255,255,0.07);
  transform: translateY(-3px);
}

.prototype-card__image-wrap {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: rgba(0,0,0,0.3);
}

.prototype-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--ease-base);
}

.prototype-card__image--contain {
  object-fit: contain;
  padding: var(--sp-4);
}

.prototype-card__link:hover .prototype-card__image {
  transform: scale(1.03);
}

.prototype-card__body {
  padding: var(--sp-4) var(--sp-6) var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  flex: 1;
}

.prototype-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-on-dark);
}

.prototype-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted-dark);
  line-height: 1.5;
  flex: 1;
}

.prototype-card__cta {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-emerald);
  margin-top: var(--sp-2);
  transition: color var(--ease-fast);
}

.prototype-card__link:hover .prototype-card__cta {
  color: #4dd9a0;
}

/* ── Case Studies ── */
#work {
  background: var(--color-bg-light);
}

.work__label {
  margin-bottom: var(--sp-4);
}

.work__heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text-on-light);
  margin-bottom: var(--sp-12);
}

.work__list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.case-card__inner {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  align-items: center;
  gap: var(--sp-8);
  padding: var(--sp-8) var(--sp-8);
  background: var(--color-bg-dark);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-dark);
  transition: border-color var(--ease-base), background var(--ease-base);
  text-decoration: none;
}

.case-card__inner:hover {
  border-color: var(--color-cobalt);
  background: var(--color-surface-raised-dark);
}

.case-card__meta {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.case-card__number {
  font-size: var(--text-xs);
  color: var(--color-text-muted-dark);
}

.case-card__tag {
  font-size: var(--text-xs);
  color: var(--color-text-muted-dark);
  font-family: var(--font-mono);
}

.case-card__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text-on-dark);
  margin-bottom: var(--sp-3);
}

.case-card__problem,
.case-card__outcome {
  font-size: var(--text-sm);
  color: var(--color-text-muted-dark);
  line-height: 1.5;
  margin-bottom: var(--sp-2);
}

.case-card__problem strong,
.case-card__outcome strong {
  color: var(--color-text-on-dark);
  font-weight: 600;
}

.case-card__cta {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-cobalt);
  white-space: nowrap;
  transition: color var(--ease-fast);
}

.case-card__inner:hover .case-card__cta {
  color: #5b82e6;
}

@media (max-width: 700px) {
  .case-card__inner {
    grid-template-columns: 1fr;
    gap: var(--sp-4);
  }
  .case-card__cta { display: none; }
}

/* ── Writing ── */
#writing {
  background: var(--color-bg-white);
  border-top: 1px solid var(--color-border-light);
}

.writing__label {
  margin-bottom: var(--sp-4);
}

.writing__heading {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text-on-light);
  margin-bottom: var(--sp-8);
}

.writing__list {
  display: flex;
  flex-direction: column;
}

.writing__item {
  border-top: 1px solid var(--color-border-light);
}

.writing__item:last-child {
  border-bottom: 1px solid var(--color-border-light);
}

.writing__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-8);
  padding: var(--sp-6) 0;
  transition: color var(--ease-fast);
  text-decoration: none;
}

.writing__link:hover .writing__title {
  color: var(--color-cobalt);
}

.writing__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-on-light);
  margin-bottom: var(--sp-1);
  transition: color var(--ease-fast);
}

.writing__teaser {
  font-size: var(--text-sm);
  color: var(--color-text-muted-light);
}

.writing__date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted-light);
  white-space: nowrap;
  flex-shrink: 0;
  transition: color var(--ease-fast);
}

.writing__link:hover .writing__date {
  color: var(--color-cobalt);
}

/* ── Contact ── */
#contact {
  background: var(--color-bg-dark);
  padding-block: clamp(5rem, 10vw, 8rem);
}

.contact__inner {
  display: flex;
  flex-direction: column;
  gap: var(--sp-8);
}

.contact__heading {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text-on-dark);
  line-height: 1.1;
  margin-top: var(--sp-4);
  margin-bottom: var(--sp-4);
}

.contact__sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted-dark);
  max-width: 480px;
  line-height: 1.65;
}

.contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
}

/* ── Social badges ── */
.social-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  transition: opacity var(--ease-fast), transform var(--ease-fast);
}

.social-badge:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.social-badge--linkedin {
  background: #0077B5;
  color: #fff;
}

.social-badge--github {
  background: #24292e;
  color: #fff;
}

.contact__footer-note {
  margin-top: var(--sp-16);
  font-size: var(--text-xs);
  color: var(--color-text-muted-dark);
  font-family: var(--font-mono);
}

/* ── Contact form ── */
.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  max-width: 560px;
}

.contact__form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-4);
}

.contact__field {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.contact__field label {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted-dark);
}

.contact__field input {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  padding: var(--sp-3) var(--sp-4);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-on-dark);
  transition: border-color var(--ease-fast), background var(--ease-fast);
  width: 100%;
}

.contact__field input::placeholder,
.contact__field textarea::placeholder {
  color: var(--color-text-muted-dark);
}

.contact__field input:focus,
.contact__field textarea:focus {
  outline: none;
  border-color: var(--color-cobalt);
  background: rgba(255,255,255,0.09);
}

.contact__field textarea {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  padding: var(--sp-3) var(--sp-4);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-on-dark);
  transition: border-color var(--ease-fast), background var(--ease-fast);
  width: 100%;
  resize: vertical;
}

.contact__status {
  font-size: var(--text-sm);
  font-family: var(--font-mono);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
}

.contact__status--success {
  background: var(--color-emerald-subtle);
  color: var(--color-emerald);
}

.contact__status--error {
  background: rgba(220, 38, 38, 0.12);
  color: #f87171;
}

@media (max-width: 560px) {
  .contact__form-row { grid-template-columns: 1fr; }
}

/* ── Skip link ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--sp-4);
  background: var(--color-cobalt);
  color: #fff;
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--text-sm);
  z-index: 9999;
  transition: top var(--ease-fast);
}
.skip-link:focus { top: var(--sp-4); }

/* ── Focus styles ── */
:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ── Dark mode (system preference) ── */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg-light:    #181714;
    --color-bg-white:    #1e1b17;
    --color-text-on-light: #f0ece4;
    --color-text-muted-light: #999;
    --color-border-light: #2e2b26;
  }

  #nav {
    background: rgba(24, 23, 20, 0.92);
  }

  .case-card__inner {
    background: #111;
    border-color: #222;
  }
}