/* ==========================================================================
   DESIGN TOKENS AND BASE STYLES
   ========================================================================== */

:root {
  --bg-desktop: #111113;
  --sheet-bg: #f4efe6;
  --sheet-border: #141414;
  --sheet-text: #141414;
  --sheet-muted: #57534e;
  --sheet-subtle: #78716c;
  --sheet-border-subtle: rgba(20, 20, 20, 0.16);
  --sheet-box-bg: rgba(20, 20, 20, 0.035);
  --sheet-highlight: #fffaea;
  --accent-ink: #0d0d0f;
  --accent-blue: #1d4ed8;
  --font-grotesque: 'Bricolage Grotesque', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Instrument Serif', Georgia, serif;
  --font-mono: 'Space Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --font-weight-hero: 740;
}

/* Base Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-desktop);
  color: var(--sheet-text);
  font-family: var(--font-grotesque);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 0 3.5rem 0;
  overflow-x: hidden;
}

/* ==========================================================================
   SUBTLE EDITORIAL PRELOADER ANIMATION
   ========================================================================== */
.specimen-loader {
  position: fixed;
  inset: 0;
  background-color: #f4efe6;
  color: #141414;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  transition: transform 0.5s cubic-bezier(0.76, 0, 0.24, 1), opacity 0.35s ease;
}

.specimen-loader.loaded {
  transform: translateY(-100%);
  pointer-events: none;
}

.loader-inner {
  width: 100%;
  max-width: 440px;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  font-family: var(--font-mono);
}

.loader-tag {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #78716c;
}

.loader-headline {
  font-family: var(--font-grotesque);
  font-size: clamp(2.2rem, 6vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  background-color: rgba(20, 20, 20, 0.18);
  background-image: linear-gradient(#141414, #141414);
  background-repeat: no-repeat;
  background-size: var(--loader-progress, 0%) 100%;
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.loader-bar-wrap {
  width: 100%;
  height: 3px;
  background: rgba(20, 20, 20, 0.12);
  position: relative;
  overflow: hidden;
  margin-top: 0.5rem;
}

.loader-progress-bar {
  height: 100%;
  width: 0%;
  background: #141414;
}

.loader-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: #57534e;
}

.loader-mono {
  font-weight: 700;
  color: #141414;
}

/* ==========================================================================
   TOP BAR
   ========================================================================== */
.top-system-bar {
  width: 100%;
  max-width: 980px;
  padding: 1.1rem 1.25rem 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #a3a3a3;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

.system-title {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  color: #f5f5f5;
  font-weight: 500;
}

.system-status {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.76rem;
}

.sound-toggle-btn {
  background: transparent;
  border: 1px solid #333333;
  color: #a3a3a3;
  width: 26px;
  height: 26px;
  border-radius: 4px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: all 0.15s ease;
  user-select: none;
}

.sound-toggle-btn:hover,
.sound-toggle-btn:focus-visible {
  border-color: #666666;
  color: #ffffff;
  outline: none;
  background: rgba(255, 255, 255, 0.08);
}

.sound-toggle-btn svg {
  display: block;
}

.sound-mute-mark {
  display: none !important;
}

.sound-toggle-btn.is-muted {
  border-color: rgba(239, 68, 68, 0.45);
  color: #ef4444;
  opacity: 0.9;
}

.sound-toggle-btn.is-muted:hover {
  border-color: #ef4444;
  color: #fca5a5;
  background: rgba(239, 68, 68, 0.08);
}

.sound-toggle-btn.is-muted .sound-waves {
  display: none !important;
}

.sound-toggle-btn.is-muted .sound-mute-mark {
  display: block !important;
}

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: #d4d4d4;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #22c55e;
  box-shadow: 0 0 8px rgba(34, 197, 94, 0.6);
  animation: pulse-dot 2.5s infinite ease-in-out;
}

.status-clock {
  color: #8a8a8a;
  border-left: 1px solid #333333;
  padding-left: 0.75rem;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.85); }
}

/* ==========================================================================
   PORTFOLIO SHEET
   ========================================================================== */
.specimen-sheet {
  width: 100%;
  max-width: 980px;
  background-color: var(--sheet-bg);
  color: var(--sheet-text);
  border: 1.5px solid var(--sheet-border);
  box-shadow: 0 25px 65px -15px rgba(0, 0, 0, 0.65), 0 0 0 1px rgba(255, 255, 255, 0.04);
  padding: 2.75rem 3.25rem;
  position: relative;
  transition: all 0.3s ease;
  opacity: 0;
  transform: translateY(16px);
  animation: pageEnter 1s cubic-bezier(0.16, 1, 0.3, 1) 0.15s forwards;
}

@keyframes pageEnter {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Authentic Paper Texture Grain */
.specimen-sheet::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(20, 20, 20, 0.045) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
  opacity: 0.5;
}

/* ==========================================================================
   SPECIMEN HEADER
   ========================================================================== */
.specimen-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  position: relative;
  z-index: 2;
}

.specimen-tag {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--sheet-muted);
  font-weight: 500;
}

.mode-toggle-group {
  display: inline-flex;
  align-items: center;
  border: 1.5px solid var(--sheet-border);
  border-radius: 9999px;
  padding: 2px;
  background: rgba(255, 255, 255, 0.4);
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.mode-toggle-btn {
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 0.4rem 1.05rem;
  border-radius: 9999px;
  cursor: pointer;
  color: var(--sheet-text);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  min-height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.mode-toggle-btn.active {
  background: var(--sheet-border);
  color: var(--sheet-bg);
  box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}