/* ══════════ CSS VARIABLES (Consistent Dark Mode) ══════════ */
:root {
  --brand-blue: #0074d9;
  --brand-green: #2ecc71;
  --brand-glow: #4da8ff;
  --brand-gradient: linear-gradient(135deg, #0074d9 0%, #2ecc71 100%);

  --bg-base: #000000;
  /* Deep black for 3D stage */
  --bg-surface: rgba(22, 34, 51, 0.75);
  /* Improved opacity for performance */
  --bg-panel: rgba(10, 15, 25, 0.85);
  /* Overlay panel bg */

  --text-primary: #d8eaf8;
  --text-secondary: #7eb8e0;
  --text-muted: #456070;

  --accent-primary: #4da8ff;
  --accent-secondary: #2ecc71;

  --border-default: rgba(77, 168, 255, 0.15);
  --border-active: rgba(77, 168, 255, 0.4);

  --border-radius-md: 16px;
  --border-radius-lg: 24px;

  --shadow-lx: 0 30px 60px rgba(0, 0, 0, 0.6);
  --theme-transition: 0.4s cubic-bezier(0.23, 1, 0.32, 1);
}

/* ══════════ GLOBAL ══════════ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  overflow: hidden;
  font-family:
    "Pretendard",
    -apple-system,
    sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

/* ══════════ 3D KEYBOARD STAGE ══════════ */
#keyboard-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, #0a111a 0%, #000000 100%);
}

#keyboard-canvas {
  width: 100%;
  height: 100%;
  cursor: grab;
}

#keyboard-canvas:active {
  cursor: grabbing;
}

#keyboard-label {
  position: absolute;
  bottom: 5rem;
  width: 100%;
  text-align: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  pointer-events: none;
  opacity: 0.6;
}

/* ══════════ KEYBOARD: LIGHT TOGGLE ══════════ */
.kbd-light-toggle {
  /* Drawer 안에 들어가는 버튼이라, 고정 위치 스타일은 쓰지 않음 */
  font-weight: 800;
  letter-spacing: 0.02em;
}

.kbd-light-toggle:hover {
  color: #fff;
}

.kbd-light-toggle:active {
  transform: none;
}

/* ══════════ OVERLAY ENGINE ══════════ */
.stage-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.4s ease;
}

.stage-overlay.active {
  pointer-events: auto;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  /* Reduced for performance */
}

.overlay-panel {
  position: absolute;
  width: min(90vw, 900px);
  max-height: 85vh;
  background: var(--bg-panel);
  border: 1px solid var(--border-default);
  border-radius: var(--border-radius-lg);
  padding: 4rem 5rem;
  box-shadow: var(--shadow-lx);
  overflow-y: auto;
  opacity: 0;
  transform: scale(0.95) translateY(20px);
  pointer-events: none;
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
  backdrop-filter: blur(12px);
  /* Optimized from 20px */
  will-change: transform, opacity;
}

.overlay-panel.active {
  opacity: 1;
  transform: scale(1) translateY(0);
  pointer-events: auto;
}

.close-overlay {
  position: fixed;
  top: 2rem;
  right: 2.5rem;
  z-index: 200;
  background: var(--bg-surface);
  border: 1px solid var(--border-active);
  color: var(--text-primary);
  padding: 0.8rem 1.8rem;
  border-radius: 100px;
  font-weight: 800;
  cursor: pointer;
  transition: 0.2s;
  display: none;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.close-overlay.active {
  display: block;
}

.close-overlay:hover {
  background: var(--accent-primary);
  color: #000;
}

/* ══════════ TYPOGRAPHY & BLOCKS ══════════ */
.eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-secondary);
  margin-bottom: 1.5rem;
  letter-spacing: 0.1em;
}

.overlay-panel h1 {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.grad-text {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.divider {
  width: 50px;
  height: 6px;
  background: var(--brand-gradient);
  border-radius: 3px;
  margin-bottom: 2rem;
}

.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 2rem;
}

.ps-item {
  display: flex;
  gap: 1rem;
  background: rgba(255, 255, 255, 0.03);
  padding: 1.5rem;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-default);
  margin-bottom: 1rem;
}

.ps-num {
  width: 28px;
  height: 28px;
  background: var(--brand-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 900;
  color: #fff;
  flex-shrink: 0;
}

.card {
  padding: 2rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-default);
  border-radius: var(--border-radius-md);
}

.skill-tag {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  margin: 0.3rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.85rem;
}

/* ══════════ WORKS GRID ══════════ */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.project-mini-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  padding: 2.2rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
  will-change: transform;
}

.project-mini-card:hover {
  background: rgba(40, 60, 90, 0.8);
  border-color: var(--accent-primary);
  transform: translateY(-8px);
  box-shadow: 0 15px 40px rgba(0, 116, 217, 0.3);
}

.project-mini-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.6rem;
}

.project-mini-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ══════════ DRAWER TOOLS (LEFT-MIDDLE) ══════════ */
#drawer-tools {
  position: fixed;
  left: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 600;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.drawer-trigger {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
  padding: 0.8rem 1.2rem;
  border-radius: 12px;
  font-weight: 700;
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}

.drawer-trigger:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: var(--accent-primary);
}

.drawer-content {
  background: rgba(10, 15, 25, 0.9);
  border: 1px solid var(--border-default);
  border-radius: 16px;
  padding: 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(15px);
  opacity: 0;
  transform: scale(0.9) translateX(-10px);
  pointer-events: none;
  transition: 0.3s;
}

#drawer-tools.active .drawer-content {
  opacity: 1;
  transform: scale(1) translateX(0);
  pointer-events: auto;
}

.drawer-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.8rem 1.2rem;
  border-radius: 10px;
  cursor: pointer;
  text-align: left;
  font-weight: 600;
  font-size: 0.9rem;
  transition: 0.2s;
  white-space: nowrap;
}

.drawer-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.drawer-btn .divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
  margin: 0.4rem 0;
  pointer-events: none;
}

/* ══════════ LOGO & BOTTOM (Simplified) ══════════ */
#logo {
  position: fixed;
  top: 2rem;
  left: 2.5rem;
  z-index: 50;
}

.logo-text {
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.logo-text span {
  color: var(--accent-primary);
}

#bottom-bar {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 50;
  padding: 0.6rem 2rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 100px;
  backdrop-filter: blur(10px);
}

.bb-status {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ══════════ CONTACT ══════════ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 2.5rem;
}

.contact-item {
  padding: 2.2rem;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-default);
  text-align: left;
}

.ci-label {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.6rem;
}

.ci-val {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-primary);
}

/* ══════════ DRAWING ══════════ */
#draw-canvas {
  position: fixed;
  pointer-events: none;
  z-index: 500;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

#draw-canvas.active {
  pointer-events: all;
  cursor: crosshair;
}

/* 모바일 화면에서 편집 도구 숨기기 */
@media (max-width: 768px) {
  #drawer-tools {
    display: none !important;
  }
}

/* ══════════ MOBILE RESPONSIVE (V19) ══════════ */
@media (max-width: 768px) {
  .overlay-panel {
    padding: 2.5rem 1.5rem;
    /* 여백 축소 */
    width: 95vw;
    max-height: 90vh;
  }

  .overlay-panel h1 {
    font-size: 1.8rem;
    /* 제목 크기 축소 */
    line-height: 1.3;
  }

  .overview-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    /* 1열로 변경 */
    gap: 1.5rem;
  }

  .close-overlay {
    top: 1rem;
    right: 1rem;
    padding: 0.6rem 1.2rem;
    font-size: 0.8rem;
  }

  .eyebrow {
    margin-bottom: 0.8rem;
  }

  #bottom-bar {
    display: none;
    /* 화면 확보를 위해 하단 바 숨김 */
  }
}