/* ==========================================================================
   PORTFOLIO MODERN LEFT NAVIGATION SYSTEM
   Authority: Near-black glass, restrained amber accent, compact mono typography
   States: [data-nav-state="hidden" | "rail" | "expanded"]
   Utility style: Claude Code / Codex-style modern precision navigation
   ========================================================================== */

:root {
  --nav-bg: rgba(6, 8, 12, 0.58);
  --nav-bg-expanded: rgba(7, 9, 14, 0.84);
  --nav-bg-solid: #06080c;
  --nav-border: rgba(244, 239, 232, 0.08);
  --nav-border-hover: rgba(244, 239, 232, 0.18);
  --nav-text: rgba(244, 239, 232, 0.80);
  --nav-text-hover: #ffffff;
  --nav-text-active: #ffffff;
  --nav-amber: #ffaa40;
  --nav-amber-light: #ffc278;
  --nav-amber-subtle: rgba(255, 170, 64, 0.11);
  --nav-amber-glow: rgba(255, 170, 64, 0.45);
  --nav-blur: 20px;
  --nav-rail-w: 52px;
  --nav-expanded-w: 224px;
  --nav-transition: 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Container Navigation Shell */
.portfolio-left-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  height: 100vh;
  height: 100dvh;
  z-index: 120;
  display: flex;
  flex-direction: column;
  background: var(--nav-bg);
  backdrop-filter: blur(var(--nav-blur));
  -webkit-backdrop-filter: blur(var(--nav-blur));
  border-right: 1px solid var(--nav-border);
  box-sizing: border-box;
  user-select: none;
  contain: layout style;
  transition: width var(--nav-transition), transform var(--nav-transition), border-color var(--nav-transition);
}

/* Glass Highlight Line at Right Edge */
.portfolio-left-nav::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 1px;
  height: 100%;
  background: linear-gradient(180deg, rgba(255, 170, 64, 0.25) 0%, rgba(244, 239, 232, 0.05) 30%, transparent 100%);
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   THE THREE STATES: hidden | rail | expanded
   -------------------------------------------------------------------------- */

/* State 1: Hidden */
.portfolio-left-nav[data-nav-state="hidden"] {
  width: var(--nav-rail-w);
  transform: translateX(-100%);
  pointer-events: none;
}

/* State 2: Logo-only Rail */
.portfolio-left-nav[data-nav-state="rail"] {
  width: var(--nav-rail-w);
  transform: translateX(0);
}

/* State 3: Expanded */
.portfolio-left-nav[data-nav-state="expanded"] {
  width: var(--nav-expanded-w);
  background: var(--nav-bg-expanded);
  transform: translateX(0);
  box-shadow: 14px 0 40px rgba(0, 0, 0, 0.58), 0 0 0 1px rgba(244, 239, 232, 0.04);
}

/* --------------------------------------------------------------------------
   DISCRETE EDGE TRIGGER (Active when Hidden)
   -------------------------------------------------------------------------- */
.portfolio-left-nav__edge-trigger {
  position: fixed;
  top: 18px;
  left: 0;
  z-index: 125;
  width: 22px;
  height: 34px;
  border-radius: 0 6px 6px 0;
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--nav-border);
  border-left: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--nav-text);
  padding: 0;
  margin: 0;
  outline: none;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-100%);
  transition: opacity 0.2s ease, transform 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.portfolio-left-nav[data-nav-state="hidden"] + .portfolio-left-nav__edge-trigger,
body.nav-is-hidden .portfolio-left-nav__edge-trigger {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}

.portfolio-left-nav__edge-trigger:hover,
.portfolio-left-nav__edge-trigger:focus-visible {
  color: var(--nav-amber);
  border-color: rgba(255, 170, 64, 0.35);
  background: rgba(16, 22, 32, 0.95);
}

.edge-trigger__dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--nav-amber);
  box-shadow: 0 0 6px var(--nav-amber);
}

/* --------------------------------------------------------------------------
   NAV HEADER / LOGO
   -------------------------------------------------------------------------- */
.portfolio-left-nav__header {
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 0 14px;
  border-bottom: 1px solid rgba(244, 239, 232, 0.05);
  box-sizing: border-box;
  overflow: hidden;
}

.portfolio-left-nav__logo-btn {
  background: transparent;
  border: none;
  padding: 0;
  margin: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--nav-text-active);
  text-decoration: none;
  outline: none;
  height: 32px;
  width: 100%;
}

.left-nav__logo-mark {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  height: 16px;
}

.left-nav__logo-mark .fw-logo-svg {
  height: 16px;
  width: auto;
  display: block;
}

.fw-logo-dot {
  filter: drop-shadow(0 0 6px rgba(254, 138, 47, 0.8));
}

.left-nav__state-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: none;
  color: #8a94a6;
  opacity: 0;
  white-space: nowrap;
  pointer-events: none;
  transition: opacity 0.18s ease;
}

.portfolio-left-nav[data-nav-state="expanded"] .left-nav__state-badge {
  opacity: 1;
}

/* --------------------------------------------------------------------------
   PRIMARY NAVIGATION LIST
   -------------------------------------------------------------------------- */
.portfolio-left-nav__list {
  list-style: none;
  margin: 16px 0 0 0;
  padding: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none;
}

.portfolio-left-nav__list::-webkit-scrollbar {
  display: none;
}

.portfolio-left-nav__item {
  position: relative;
  margin: 0 6px;
}

.portfolio-left-nav__link-row {
  display: flex;
  align-items: center;
  position: relative;
  border-radius: 6px;
  transition: background 0.15s ease, color 0.15s ease;
}

.portfolio-left-nav__link-row:hover,
.portfolio-left-nav__item:not(.portfolio-left-nav__item--expandable) .portfolio-left-nav__link:hover {
  background: rgba(244, 239, 232, 0.06);
}

.portfolio-left-nav__link {
  display: flex;
  align-items: center;
  width: 100%;
  height: 40px;
  padding: 0 10px;
  color: var(--nav-text);
  text-decoration: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.025em;
  text-transform: none;
  position: relative;
  border-radius: 6px;
  outline: none;
  overflow: hidden;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: color 0.15s ease, background 0.15s ease;
}

.portfolio-left-nav__link:hover,
.portfolio-left-nav__link:focus-visible {
  color: var(--nav-text-hover);
}

/* Active Indicator Line (Restrained Amber) */
.left-nav__indicator {
  position: absolute;
  left: 0;
  top: 7px;
  bottom: 7px;
  width: 2.5px;
  border-radius: 1.5px;
  background: var(--nav-amber);
  opacity: 0;
  box-shadow: 0 0 8px var(--nav-amber), 0 0 12px rgba(255, 170, 64, 0.5);
  transition: opacity 0.2s ease, transform 0.2s ease;
  transform: scaleY(0.4);
}

.portfolio-left-nav__item.is-active > .portfolio-left-nav__link .left-nav__indicator,
.portfolio-left-nav__item.is-active > .portfolio-left-nav__link-row .left-nav__indicator {
  opacity: 1;
  transform: scaleY(1);
}

.portfolio-left-nav__item.is-active > .portfolio-left-nav__link,
.portfolio-left-nav__item.is-active > .portfolio-left-nav__link-row {
  color: var(--nav-text-active);
  background: var(--nav-amber-subtle);
  box-shadow: inset 0 0 0 1px rgba(255, 170, 64, 0.22), 0 2px 8px rgba(0, 0, 0, 0.25);
}

/* Nav Item Icon */
.left-nav__icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-right: 12px;
  color: inherit;
  transition: transform 0.15s ease, color 0.15s ease, filter 0.15s ease;
}

.portfolio-left-nav__item.is-active .left-nav__icon {
  color: var(--nav-amber);
  filter: drop-shadow(0 0 4px rgba(255, 170, 64, 0.5));
}

/* Nav Item Label */
.left-nav__label {
  white-space: nowrap;
  opacity: 0;
  transform: translateX(-6px);
  pointer-events: none;
  flex: 1;
  transition: opacity 0.18s ease, transform 0.18s ease, text-shadow 0.15s ease;
}

.portfolio-left-nav[data-nav-state="expanded"] .left-nav__label {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.portfolio-left-nav__item.is-active .left-nav__label {
  color: #ffffff;
  font-weight: 550;
  text-shadow: 0 0 12px rgba(255, 255, 255, 0.28);
}

/* Nav Item Meta (01, 02, 03) */
.left-nav__meta {
  font-size: 9px;
  color: rgba(244, 239, 232, 0.28);
  font-weight: 500;
  letter-spacing: 0.08em;
  opacity: 0;
  margin-left: 8px;
  margin-right: 4px;
  transition: opacity 0.18s ease;
}

.portfolio-left-nav[data-nav-state="expanded"] .left-nav__meta {
  opacity: 1;
}

/* --------------------------------------------------------------------------
   EXPANDABLE ITEM: EDUCATION & CHEVRON
   -------------------------------------------------------------------------- */
.left-nav__expand-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0 8px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--nav-text);
  outline: none;
  opacity: 0;
  pointer-events: none;
  transition: color 0.15s ease, transform 0.2s ease, opacity 0.18s ease;
}

.portfolio-left-nav[data-nav-state="expanded"] .left-nav__expand-btn {
  opacity: 1;
  pointer-events: auto;
}

.left-nav__expand-btn:hover {
  color: var(--nav-amber);
}

.expand-btn__chevron {
  transition: transform 0.2s ease;
}

.portfolio-left-nav__item--expandable.is-expanded .expand-btn__chevron {
  transform: rotate(180deg);
}

/* --------------------------------------------------------------------------
   NESTED CHILD DESTINATIONS (THE 5 CHAPTER II SCENES)
   -------------------------------------------------------------------------- */
.portfolio-left-nav__sublist {
  list-style: none;
  margin: 3px 0 6px 14px;
  padding: 0 0 0 10px;
  border-left: 1px solid rgba(244, 239, 232, 0.12);
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  transition: max-height 0.24s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s ease;
}

/* Revealed only when navigation is expanded AND item is expanded */
.portfolio-left-nav[data-nav-state="expanded"] .portfolio-left-nav__item--expandable.is-expanded .portfolio-left-nav__sublist {
  max-height: 240px;
  opacity: 1;
  pointer-events: auto;
}

.portfolio-left-nav__subitem {
  margin: 0;
}

.portfolio-left-nav__sublink {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 9px;
  color: rgba(244, 239, 232, 0.74);
  text-decoration: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: none;
  border-radius: 5px;
  outline: none;
  white-space: nowrap;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  transition: color 0.15s ease, background 0.15s ease, text-shadow 0.15s ease, box-shadow 0.15s ease;
}

.portfolio-left-nav__sublink:hover,
.portfolio-left-nav__sublink:focus-visible {
  color: #ffffff;
  background: rgba(244, 239, 232, 0.06);
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

.sublink__pip {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(244, 239, 232, 0.40);
  flex-shrink: 0;
  transition: background 0.15s ease, box-shadow 0.15s ease;
}

.portfolio-left-nav__sublink:hover .sublink__pip {
  background: #ffffff;
  box-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
}

.sublink__code {
  color: rgba(244, 239, 232, 0.38);
  font-size: 9.5px;
  font-weight: 500;
}

.sublink__text {
  flex: 1;
}

/* Active Child Destination */
.portfolio-left-nav__sublink.is-child-active {
  color: var(--nav-amber-light);
  font-weight: 550;
  background: rgba(255, 170, 64, 0.12);
  box-shadow: inset 0 0 0 1px rgba(255, 170, 64, 0.25);
  text-shadow: 0 0 10px rgba(255, 170, 64, 0.45);
}

.portfolio-left-nav__sublink.is-child-active .sublink__pip {
  background: var(--nav-amber);
  box-shadow: 0 0 6px var(--nav-amber), 0 0 10px rgba(255, 170, 64, 0.7);
}

.portfolio-left-nav__sublink.is-child-active .sublink__code {
  color: rgba(255, 170, 64, 0.7);
}

/* --------------------------------------------------------------------------
   BOTTOM UTILITY CONTROLS / CYCLE BUTTON
   -------------------------------------------------------------------------- */
.portfolio-left-nav__footer {
  padding: 10px 8px;
  border-top: 1px solid rgba(244, 239, 232, 0.05);
  display: flex;
  align-items: center;
  box-sizing: border-box;
}

.left-nav__state-cycle-btn {
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  width: 36px;
  height: 36px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  margin: 0 2px;
  color: var(--nav-text);
  outline: none;
  box-sizing: border-box;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.left-nav__state-cycle-btn:hover,
.left-nav__state-cycle-btn:focus-visible {
  color: var(--nav-text-hover);
  background: rgba(244, 239, 232, 0.04);
  border-color: rgba(244, 239, 232, 0.1);
}

.cycle-btn__icon {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin: 0;
}

/* Center alignment in Rail state */
.portfolio-left-nav[data-nav-state="rail"] .portfolio-left-nav__header {
  justify-content: center;
  padding: 0;
  width: var(--nav-rail-w);
}

.portfolio-left-nav[data-nav-state="rail"] .portfolio-left-nav__logo-btn {
  justify-content: center;
  align-items: center;
  width: 100%;
  padding: 0;
  gap: 0;
}

.portfolio-left-nav[data-nav-state="rail"] .left-nav__logo-mark {
  width: 100%;
  justify-content: center;
  text-align: center;
}

.portfolio-left-nav[data-nav-state="rail"] .portfolio-left-nav__item {
  margin: 0 4px;
}

.portfolio-left-nav[data-nav-state="rail"] .portfolio-left-nav__link-row {
  justify-content: center;
  width: 100%;
}

.portfolio-left-nav[data-nav-state="rail"] .portfolio-left-nav__link {
  justify-content: center;
  padding: 0;
  width: 100%;
}

.portfolio-left-nav[data-nav-state="rail"] .left-nav__icon {
  margin-right: 0;
}

.portfolio-left-nav[data-nav-state="rail"] .left-nav__label,
.portfolio-left-nav[data-nav-state="rail"] .left-nav__expand-btn,
.portfolio-left-nav[data-nav-state="rail"] .left-nav__meta,
.portfolio-left-nav[data-nav-state="rail"] .left-nav__state-badge {
  display: none !important;
}

.portfolio-left-nav[data-nav-state="rail"] .portfolio-left-nav__footer {
  justify-content: center;
  padding: 10px 4px;
  width: var(--nav-rail-w);
}

.portfolio-left-nav[data-nav-state="rail"] .left-nav__state-cycle-btn {
  justify-content: center;
  padding: 0;
  width: 36px;
  margin: 0 auto;
}

.portfolio-left-nav[data-nav-state="rail"] .cycle-btn__icon {
  margin: 0;
}

/* --------------------------------------------------------------------------
   INTEGRATION COEXISTENCE: Top Header Coordination
   -------------------------------------------------------------------------- */
/* When left nav is visible (rail or expanded), suppress redundant top header logo */
body.has-left-nav:not(.nav-is-hidden) .portfolio-header__logo {
  display: none !important;
  opacity: 0 !important;
  pointer-events: none !important;
  visibility: hidden !important;
}

body.has-left-nav.nav-is-hidden .portfolio-header__logo {
  display: inline-flex !important;
  opacity: 1 !important;
  pointer-events: auto !important;
  visibility: visible !important;
}

body.has-left-nav .portfolio-header {
  border-bottom: none !important;
  transition: padding-left var(--nav-transition);
}

/* When left nav is hidden, provide safe left clearance so discrete edge trigger does not collide with FW logo */
body.has-left-nav.nav-is-hidden .portfolio-header {
  padding-left: clamp(38px, 6vw, 64px);
}

/* --------------------------------------------------------------------------
   RESPONSIVE DESIGN (MOBILE & TABLET)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --nav-rail-w: 46px;
    --nav-expanded-w: min(220px, 72vw);
  }

  .portfolio-left-nav__header {
    height: 52px;
    padding: 0 10px;
  }

  .portfolio-left-nav__link {
    height: 38px;
    padding: 0 8px;
  }

  .left-nav__icon {
    margin-right: 10px;
  }

  .portfolio-left-nav__edge-trigger {
    top: 14px;
    height: 30px;
  }
}