/**
 * Danish Khan website
 * Structural layout system.
 *
 * Responsibilities:
 * page widths
 * containers
 * section spacing
 * header
 * navigation
 * footer
 * generic grids
 *
 * Component-specific styling belongs in components.css.
 */

/* =============================================================
   PAGE CONTAINERS
   ============================================================= */

.container {
  width: 100%;
  max-width: var(--max-page-width);

  margin-inline: auto;

  padding-inline: var(--gutter-mobile);
}

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

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

/*
 * Wide content area used for project grids and
 * homepage visual sections.
 */

.content-container {
  width: 100%;
  max-width: var(--content-width);

  margin-inline: auto;
}

/*
 * Narrower editorial content width.
 */

.section-container {
  width: 100%;
  max-width: var(--section-width);

  margin-inline: auto;
}

/*
 * Reading width for long paragraphs.
 */

.reading-width {
  width: 100%;
  max-width: var(--reading-width);
}

/* =============================================================
   INSET PAGE SHELL
   ============================================================= */

/*
 * The reference homepage uses a white content shell that sits
 * inside the viewport rather than touching both browser edges.
 */

.page-shell {
  width: var(--page-shell-width);
  max-width: 1600px;

  margin-inline: auto;

  background: var(--color-bg);
}

/*
 * Used immediately after the cream hero.
 */

.page-shell--overlap {
  position: relative;
  z-index: 2;

  margin-top: -100px;

  border-radius: var(--radius-section) var(--radius-section) 0 0;
}

/* =============================================================
   GENERIC SECTIONS
   ============================================================= */

.section {
  position: relative;

  padding-block: var(--section-space-desktop);
}

.section--cream {
  background: var(--color-surface);
}

.section--white {
  background: var(--color-bg);
}

.section--dark {
  background: var(--color-dark-section);
  color: var(--color-dark-section-text);
}

.section--no-top {
  padding-top: 0;
}

.section--no-bottom {
  padding-bottom: 0;
}

/*
 * Useful for sections that mirror the reference's
 * centered editorial statements.
 */

.section-intro {
  width: 100%;
  max-width: var(--section-width);

  margin-inline: auto;
  margin-bottom: var(--space-8);

  text-align: center;
}

/* =============================================================
   TABLET SECTION RHYTHM
   ============================================================= */

@media (max-width: 1024px) {
  .section {
    padding-block: var(--section-space-tablet);
  }

  .page-shell {
    width: 95%;
  }

  .page-shell--overlap {
    margin-top: -64px;
  }
}

/* =============================================================
   MOBILE SECTION RHYTHM
   ============================================================= */

@media (max-width: 768px) {
  .section {
    padding-block: var(--section-space-mobile);
  }

  .page-shell {
    width: 100%;
    max-width: none;
  }

  .page-shell--overlap {
    margin-top: 0;

    border-radius: 0;
  }

  .section-intro {
    margin-bottom: var(--space-7);

    text-align: left;
  }
}

/* =============================================================
   SKIP LINK
   ============================================================= */

.skip-link {
  position: fixed;
  top: -100px;
  left: var(--space-4);
  z-index: 9999;

  display: inline-flex;
  align-items: center;

  min-height: var(--tap-target-min);

  padding: var(--space-3) var(--space-4);

  border-radius: var(--radius-md);

  background: var(--color-accent-primary);
  color: var(--color-text-on-accent);

  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;

  text-decoration: none;

  transition: top var(--duration-base) var(--easing-standard);
}

.skip-link:focus {
  top: var(--space-4);
}

/* =============================================================
   SITE HEADER
   ============================================================= */

/*
 * Direction:
 * simple white header, no heavy shadow, no glass effect
 * logo left, primary nav mathematically centered, actions right —
 * a 1fr/auto/1fr grid keeps the nav centered on the bar regardless
 * of how wide the brand or actions column is
 * flat underline nav instead of a segmented pill control
 * one accent color, one CTA, restrained hover states
 */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;

  width: 100%;

  background: var(--color-bg);

  transition:
    background-color var(--duration-base) var(--easing-standard),
    box-shadow var(--duration-base) var(--easing-standard),
    border-color var(--duration-base) var(--easing-standard);
}

.site-header__bar {
  width: 100%;
  max-width: var(--max-page-width);

  min-height: 84px;

  margin-inline: auto;

  display: flex;
  align-items: center;
  justify-content: space-between;

  gap: var(--space-6);

  padding: var(--space-4) var(--gutter-mobile);

  /* Keep sticky header geometry stable while scrolling. */
}

@media (min-width: 768px) {
  .site-header__bar {
    padding-inline: var(--gutter-tablet);
  }
}

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

/* =============================================================
   BRAND
   ============================================================= */

.site-header__brand {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;

  gap: 10px;

  flex-shrink: 0;

  color: var(--color-text-primary);

  text-decoration: none;
}

.site-header__brand-mark { display:none; }
.site-header__brand-copy { display:flex; min-width:0; flex-direction:column; gap:1px; }

.site-header__brand:hover {
  color: var(--color-text-primary);
}

.site-header__brand-name {
  color: var(--color-text-primary);

  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.2;

  letter-spacing: -0.02em;
}

.site-header__brand-descriptor {
  color: var(--color-text-muted);

  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 400;
  line-height: 1.3;
}

/* =============================================================
   HEADER ACTIONS
   ============================================================= */

.site-header__actions {
  display: flex;
  align-items: center;

  gap: var(--space-4);
}

.site-header__actions > .site-header__social {
  display: flex;
  align-items: center;

  gap: 6px;
}

.site-header__social .social-icon-link {
  width: 34px;
  height: 34px;
  min-height: 34px;

  padding: 0;

  border: 1px solid var(--color-border);
  border-radius: 50%;

  color: var(--color-text-secondary);
  background: var(--color-surface);

  text-transform: none;

  transition:
    color var(--duration-base) var(--easing-standard),
    border-color var(--duration-base) var(--easing-standard),
    background-color var(--duration-base) var(--easing-standard),
    transform var(--duration-base) var(--easing-standard);
}

.site-header__social .social-icon-link:hover {
  color: var(--color-text-primary);
  border-color: var(--color-accent-primary);
  background: var(--color-accent-primary);

  box-shadow: none;
  transform: translateY(-1px);
}

.site-header__social .social-icon-link:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.site-header__social .social-brand-icon {
  width: 15px;
  height: 15px;
}

/* =============================================================
   PRIMARY NAVIGATION
   ============================================================= */

.primary-nav {
  display: none;
}

@media (min-width: 1024px) {
  .primary-nav {
    display: block;
  }

  .primary-nav__list {
    display: flex;
    align-items: center;

    gap: 2rem;

    margin: 0;
    padding: 0;

    list-style: none;
  }

  .primary-nav__item {
    position: relative;

    margin: 0;
  }
}

/* Desktop header: logo left, nav truly centered via 1fr/auto/1fr, actions right. */
@media (min-width: 1025px) {
  .site-header {
    border-top: 3px solid var(--color-accent-primary);
    border-bottom: 1px solid var(--color-border-soft);
    background: var(--color-bg);
    box-shadow: 0 1px 0 var(--color-border-soft), 0 14px 28px -22px rgba(23, 23, 23, 0.16);
  }

  .site-header__bar {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;

    min-height: 80px;

    gap: var(--space-6);
    padding-block: 0;
  }

  .site-header__brand {
    flex-direction: row;
    align-items: center;
    justify-self: start;

    gap: 11px;

    min-width: 0;
  }

  .site-header__brand-mark {
    display: grid;
    place-items: center;
    flex: 0 0 auto;

    width: 38px;
    height: 38px;

    border-radius: var(--radius-sm);

    color: var(--color-accent-primary);
    background: #20231f;

    font: 600 .65rem/1 var(--font-sans);
    letter-spacing: .06em;

    transition:
      width var(--duration-base) var(--easing-standard),
      height var(--duration-base) var(--easing-standard);
  }

  .site-header__brand-name { font-size: 1.05rem; line-height: 1.15; }

  .site-header__brand-descriptor {
    max-width: 230px;
    overflow: hidden;

    font-size: .68rem;

    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .primary-nav { justify-self: center; }

  .primary-nav .link--nav,
  .primary-nav .dropdown__trigger {
    position: relative;

    padding: 8px 2px;

    border-radius: 0;

    color: var(--color-text-secondary);
    background: transparent;

    font-size: .9rem;
    font-weight: 600;
    letter-spacing: -0.01em;

    transition: color var(--duration-base) var(--easing-standard);
  }

  .primary-nav .link--nav::after,
  .primary-nav .dropdown__trigger::after {
    content: '';
    position: absolute;
    left: 2px;
    right: 2px;
    bottom: -2px;

    height: 2px;
    border-radius: 2px;

    background: var(--color-accent-primary);

    transform: scaleX(0);
    transform-origin: left;

    transition: transform var(--duration-base) var(--easing-standard);
  }

  .primary-nav .link--nav:hover,
  .primary-nav .dropdown__trigger:hover {
    color: var(--color-text-primary);
    background: transparent;
  }

  .primary-nav .link--nav:hover::after,
  .primary-nav .dropdown__trigger:hover::after,
  .primary-nav .link--nav[aria-current="page"]::after,
  .primary-nav .dropdown__trigger.is-current::after,
  .primary-nav .dropdown[data-open="true"] > .dropdown__trigger::after {
    transform: scaleX(1);
  }

  .primary-nav .link--nav[aria-current="page"],
  .primary-nav .dropdown__trigger.is-current,
  .primary-nav .dropdown[data-open="true"] > .dropdown__trigger {
    color: var(--color-text-primary);
    background: transparent;
    box-shadow: none;

    font-weight: 600;
  }

  .primary-nav .dropdown__caret { width: 8px; height: 8px; }

  .primary-nav .dropdown__panel {
    top: calc(100% + 20px);
    left: 50%;

    min-width: 220px;

    padding: 8px;

    border-color: var(--color-border);
    border-radius: var(--radius-md);

    background: var(--color-bg);

    box-shadow: var(--shadow-lg);

    transform: translateX(-50%);
  }

  .primary-nav .dropdown__link {
    padding: 10px 12px;

    border-radius: var(--radius-sm);

    font-size: .875rem;
    text-align: left;
  }

  .primary-nav .nav-item--contact { display: none; }

  .site-header__actions { justify-self: end; gap: var(--space-5); }

  .site-header__actions > .site-header__social {
    position: relative;

    padding-right: var(--space-5);
  }

  .site-header__actions > .site-header__social::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 0;

    width: 1px;
    height: 22px;

    background: var(--color-border-soft);

    transform: translateY(-50%);
  }

  .site-header__actions > .link--cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    gap: 8px;

    min-height: 42px;

    padding: 0 20px;

    border-radius: var(--radius-full);

    font-size: .8rem;
    font-weight: 600;
    text-transform: none;
    white-space: nowrap;

    box-shadow: 0 4px 12px -4px rgba(250, 204, 21, 0.25);

    transition:
      min-height var(--duration-base) var(--easing-standard),
      background-color var(--duration-slow) var(--easing-standard),
      border-color var(--duration-slow) var(--easing-standard),
      color var(--duration-slow) var(--easing-standard),
      box-shadow var(--duration-slow) var(--easing-standard),
      transform var(--duration-slow) var(--easing-standard);
  }

  .site-header__actions > .link--cta:hover {
    box-shadow: 0 6px 16px -4px rgba(250, 204, 21, 0.35);
    transform: translateY(-1px);
  }

  .site-header__actions > .link--cta svg {
    flex: 0 0 14px;
    width: 14px;
    height: 14px;

    transition: transform .18s ease;
  }

  .site-header__actions > .link--cta:hover svg { transform: translateX(3px); }

  /* Scroll changes elevation only: resizing here causes scroll-anchor feedback. */
  .site-header.is-scrolled {
    background: var(--color-bg);
    box-shadow: var(--shadow-md);
  }

}

@media (min-width: 1025px) and (max-width: 1199px) {
  .site-header__bar { gap: var(--space-5); }

  .site-header__brand-descriptor,
  .site-header__actions > .site-header__social { display: none; }

  .primary-nav__list { gap: 1.375rem; }

  .primary-nav .link--nav,
  .primary-nav .dropdown__trigger { font-size: .85rem; }
}

/* =============================================================
   MOBILE NAV TOGGLE
   ============================================================= */

.mobile-nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  width: var(--tap-target-min);
  height: var(--tap-target-min);

  padding: 0;

  border-radius: var(--radius-sm);

  color: var(--color-text-primary);
}

.mobile-nav-toggle:hover {
  background: var(--color-surface);
}

@media (min-width: 1024px) {
  .mobile-nav-toggle {
    display: none;
  }
}

/* =============================================================
   MOBILE NAVIGATION
   ============================================================= */

.mobile-nav {
  display: none;

  width: 100%;

  border-top: 1px solid var(--color-border);

  background: var(--color-bg);
}

.mobile-nav.is-open {
  display: block;
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;

  gap: 0;

  width: 100%;

  margin: 0;
  padding: var(--space-3) var(--gutter-mobile) var(--space-5);

  list-style: none;
}

.mobile-nav__list > li {
  width: 100%;

  margin: 0;
}

@media (min-width: 768px) {
  .mobile-nav__list {
    padding-inline: var(--gutter-tablet);
  }
}

@media (min-width: 1024px) {
  .mobile-nav {
    display: none !important;
  }
}

/* =============================================================
   MAIN CONTENT
   ============================================================= */

.site-main {
  width: 100%;
  min-height: 50vh;
}

/* =============================================================
   FOOTER
   ============================================================= */

/*
 * Keep the footer light and editorial.
 * Detailed footer components will be styled separately.
 */

.site-footer {
  width: 100%;

  padding-block: var(--space-9) var(--space-6);

  background: var(--color-surface);

  border-top: 1px solid var(--color-border-soft);
}

.site-footer__grid {
  display: grid;

  grid-template-columns: 1fr;

  gap: var(--space-7);
}

@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns:
      minmax(240px, 1.4fr)
      minmax(160px, 0.8fr)
      minmax(160px, 0.8fr);

    gap: var(--space-8);
  }
}

.site-footer__meta {
  display: flex;
  flex-direction: column;

  gap: var(--space-3);

  margin-top: var(--space-8);
  padding-top: var(--space-5);

  border-top: 1px solid var(--color-border);

  color: var(--color-text-muted);

  font-family: var(--font-sans);
  font-size: 0.75rem;
  line-height: 1.5;
}

@media (min-width: 768px) {
  .site-footer__meta {
    flex-direction: row;

    align-items: center;
    justify-content: space-between;
  }
}

/* =============================================================
   GENERIC GRIDS
   ============================================================= */

.grid {
  display: grid;

  gap: var(--space-5);
}

.grid--2 {
  grid-template-columns: 1fr;
}

.grid--3 {
  grid-template-columns: 1fr;
}

.grid--4 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .grid--4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* =============================================================
   TWO COLUMN EDITORIAL LAYOUT
   ============================================================= */

.editorial-columns {
  display: grid;

  grid-template-columns: 1fr;

  gap: var(--space-7);
}

@media (min-width: 768px) {
  .editorial-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));

    gap: var(--space-8);

    align-items: start;
  }
}

/* =============================================================
   REFERENCE STYLE 41 / 59 SPLIT
   ============================================================= */

/*
 * The reference hero uses approximately:
 *
 * image: 41%
 * content: 59%
 */

.split-41-59 {
  display: grid;

  grid-template-columns: 1fr;

  gap: var(--space-7);
}

@media (min-width: 783px) {
  .split-41-59 {
    grid-template-columns:
      minmax(0, 41fr)
      minmax(0, 59fr);

    align-items: center;

    gap: var(--space-6);
  }
}

/* =============================================================
   REFERENCE STYLE 50 / 50 SPLIT
   ============================================================= */

.split-half {
  display: grid;

  grid-template-columns: 1fr;

  gap: var(--space-7);
}

@media (min-width: 768px) {
  .split-half {
    grid-template-columns: repeat(2, minmax(0, 1fr));

    gap: var(--space-6);

    align-items: center;
  }
}

/* =============================================================
   CENTERED EDITORIAL WIDTHS
   ============================================================= */

.width-1060 {
  width: 100%;
  max-width: 1060px;

  margin-inline: auto;
}

.width-920 {
  width: 100%;
  max-width: 920px;

  margin-inline: auto;
}

.width-850 {
  width: 100%;
  max-width: 850px;

  margin-inline: auto;
}

.width-750 {
  width: 100%;
  max-width: 750px;

  margin-inline: auto;
}

.width-650 {
  width: 100%;
  max-width: 650px;

  margin-inline: auto;
}

/* =============================================================
   MOBILE HEADER
   ============================================================= */

@media (max-width: 767px) {
  .site-header__bar {
    min-height: 70px;

    gap: var(--space-3);
  }

  .site-header__brand-name {
    font-size: 1.1rem;
  }

  .site-header__brand-descriptor {
    display: none;
  }

  .site-header__social {
    display: none;
  }
}

/* =============================================================
   VERY SMALL SCREENS
   ============================================================= */

@media (max-width: 380px) {
  .container {
    padding-inline: 0.875rem;
  }

  .site-header__bar {
    padding-inline: 0.875rem;
  }
}