/**
 * layout.css
 * ─────────────────────────────────────────────────────────────────────────────
 * Global layout utilities: container, section structure, navbar, footer,
 * loading screen, and shared component patterns.
 * ─────────────────────────────────────────────────────────────────────────────
 */

/* ── CONTAINER ──────────────────────────────────────────────────
   Centered max-width wrapper with responsive horizontal padding.
──────────────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding-x);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--wide {
  max-width: var(--container-wide);
}

/* ── SECTION BASE ───────────────────────────────────────────────
   All portfolio sections share this base structure.
   Each section is a full-width block with generous vertical padding.
──────────────────────────────────────────────────────────────── */
.section {
  position: relative;
  width: 100%;
  padding-block: var(--section-padding-y);
  overflow: hidden;
}

/* Alternate section backgrounds for visual rhythm */
.section:nth-child(even) {
  background-color: var(--color-bg-secondary);
}

/* ── SECTION HEADER ─────────────────────────────────────────────
   Shared header pattern: label + headline, centered.
──────────────────────────────────────────────────────────────── */
.section-header {
  text-align: center;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
  padding: var(--space-1) var(--space-4);
  background: var(--color-accent-dim);
  border: 1px solid var(--color-accent-border);
  border-radius: var(--radius-full);
}

.section-headline {
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  font-weight: var(--weight-extrabold);
  color: var(--color-text-primary);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.section-subtext {
  margin-top: var(--space-4);
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-inline: auto;
  line-height: var(--leading-relaxed);
}

/* ── NAVBAR ─────────────────────────────────────────────────────
   Fixed top navigation bar.
──────────────────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--navbar-height);
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition:
    border-color var(--transition-base),
    background var(--transition-base);
}

/* Scrolled state — added by navigation.js */
.navbar.scrolled {
  border-bottom-color: var(--color-border);
  background: rgba(10, 10, 15, 0.95);
}

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

/* Logo */
.navbar-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--gradient-accent);
  border-radius: var(--radius-md);
  color: var(--color-text-inverse);
  font-weight: var(--weight-black);
  font-size: var(--text-xl);
  text-decoration: none;
  transition:
    transform var(--transition-spring),
    box-shadow var(--transition-base);
  flex-shrink: 0;
}

.navbar-logo:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-accent);
  color: var(--color-text-inverse);
}

/* Desktop nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  position: relative;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  transition:
    color var(--transition-fast),
    background var(--transition-fast);
  text-decoration: none;
}

.nav-link:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-card);
}

.nav-link.active {
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

/* Hamburger toggle (mobile only) */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.nav-toggle:hover {
  background: var(--color-bg-card-hover);
}

.hamburger-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition:
    transform var(--transition-base),
    opacity var(--transition-base);
  transform-origin: center;
}

/* Hamburger open state */
.nav-toggle[aria-expanded='true'] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded='true'] .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle[aria-expanded='true'] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu drawer */
.mobile-menu {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: rgba(10, 10, 15, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) var(--container-padding-x);
  transform: translateY(-10px);
  opacity: 0;
  pointer-events: none;
  transition:
    transform var(--transition-base),
    opacity var(--transition-base);
}

.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mobile-nav-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition:
    color var(--transition-fast),
    background var(--transition-fast);
  text-decoration: none;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

/* ── LOADING SCREEN ─────────────────────────────────────────────
   Full-page loading overlay shown while config is being fetched.
   Removed by app.js after initialization.
──────────────────────────────────────────────────────────────── */
.loading-screen {
  position: fixed;
  inset: 0;
  z-index: var(--z-loading);
  background: var(--color-bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    opacity var(--transition-slow),
    visibility var(--transition-slow);
}

.loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.loading-logo {
  width: 64px;
  height: 64px;
  background: var(--gradient-accent);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-3xl);
  font-weight: var(--weight-black);
  color: var(--color-text-inverse);
  animation: loading-pulse 1.5s ease-in-out infinite;
}

.loading-bar {
  width: 200px;
  height: 3px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.loading-bar-fill {
  height: 100%;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
  animation: loading-bar 1.5s ease-in-out infinite;
}

.loading-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  letter-spacing: var(--tracking-wide);
}

@keyframes loading-pulse {
  0%,
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(0, 212, 170, 0.4);
  }
  50% {
    transform: scale(1.05);
    box-shadow: 0 0 0 12px rgba(0, 212, 170, 0);
  }
}

@keyframes loading-bar {
  0% {
    width: 0%;
    margin-left: 0;
  }
  50% {
    width: 70%;
    margin-left: 0;
  }
  100% {
    width: 0%;
    margin-left: 100%;
  }
}

/* ── FOOTER ─────────────────────────────────────────────────────
   Simple footer at the bottom of the page.
──────────────────────────────────────────────────────────────── */
.site-footer {
  padding-block: var(--space-8);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-primary);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  text-align: center;
}

.footer-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.footer-name {
  color: var(--color-accent);
  font-weight: var(--weight-semibold);
}

.footer-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ── SCROLL INDICATOR ───────────────────────────────────────────
   Animated scroll-down indicator in the hero section.
──────────────────────────────────────────────────────────────── */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  animation: scroll-bounce 2s ease-in-out infinite;
}

.scroll-indicator-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  box-shadow: 0 0 8px var(--color-accent);
}

@keyframes scroll-bounce {
  0%,
  100% {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
  }
  50% {
    transform: translateX(-50%) translateY(8px);
    opacity: 0.5;
  }
}

/* ── SHARED CARD ────────────────────────────────────────────────
   Base card style used across sections.
──────────────────────────────────────────────────────────────── */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition:
    border-color var(--transition-base),
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

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

/* ── SHARED BUTTON STYLES ───────────────────────────────────────
   Reusable button variants.
──────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-accent);
  color: var(--color-text-inverse);
  border: none;
  box-shadow: 0 4px 16px rgba(0, 212, 170, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 212, 170, 0.4);
  color: var(--color-text-inverse);
}

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

.btn-secondary:hover {
  border-color: var(--color-accent-border);
  color: var(--color-accent);
  background: var(--color-accent-dim);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: none;
  padding: var(--space-2) var(--space-4);
}

.btn-ghost:hover {
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

/* ── TECH TAG / BADGE ───────────────────────────────────────────
   Small pill badges for tech stack labels.
──────────────────────────────────────────────────────────────── */
.tech-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast);
  white-space: nowrap;
}

.tech-tag:hover {
  color: var(--color-accent);
  border-color: var(--color-accent-border);
}

/* ── GRADIENT TEXT UTILITY ──────────────────────────────────────
   Apply gradient to text.
──────────────────────────────────────────────────────────────── */
.gradient-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── ICON BUTTON ────────────────────────────────────────────────
   Small square icon-only button.
──────────────────────────────────────────────────────────────── */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.btn-icon:hover {
  color: var(--color-accent);
  border-color: var(--color-accent-border);
  background: var(--color-accent-dim);
}

/* ── SOCIAL LINK ────────────────────────────────────────────────
   Social media icon links.
──────────────────────────────────────────────────────────────── */
.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: all var(--transition-base);
  text-decoration: none;
}

.social-link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent-border);
  background: var(--color-accent-dim);
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}

/* ── DIVIDER ────────────────────────────────────────────────────
   Decorative section divider.
──────────────────────────────────────────────────────────────── */
.divider {
  width: 60px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: var(--radius-full);
  margin: var(--space-4) auto;
}