/* ========== Reset & Base ========== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

:root {
  --color-bg:           #fdf8f0;
  --color-bg-pattern:   #f5ecd9;
  --color-surface:      #fffdf7;
  --color-text:         #3a2e2a;
  --color-text-muted:   #8a7768;
  --color-text-soft:    #b3a092;
  --color-border:       #ead9bf;
  --color-border-strong:#d8c4a3;

  --color-accent:       #c87358;
  --color-accent-hover: #b35e44;
  --color-accent-bg:    #f9ebe2;
  --color-secondary:    #2a9d8f;
  --color-secondary-bg: #e8f3f0;

  --color-error:        #c4453a;
  --color-error-bg:     #fbeae7;

  /* HTMLハイライト */
  --hl-tag-bracket: #999999;
  --hl-tag-name:    #800000;
  --hl-attr-name:   #c75300;
  --hl-attr-value:  #0451a5;
  --hl-comment:     #008000;
  --hl-doctype:     #808080;
  --hl-entity:      #af00db;

  --radius:    12px;
  --radius-lg: 18px;

  --shadow-sm: 0 1px 2px rgba(58, 46, 42, 0.06);
  --shadow-md: 0 2px 8px rgba(58, 46, 42, 0.08), 0 8px 24px rgba(58, 46, 42, 0.06);

  --transition: 180ms cubic-bezier(.2,.8,.2,1);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, ui-monospace, "Cascadia Code",
    Menlo, Consolas, "Courier New", monospace;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  background-image: radial-gradient(circle at 1px 1px, var(--color-bg-pattern) 1px, transparent 0);
  background-size: 24px 24px;
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.header { text-align: center; margin-bottom: 28px; }

.mascot {
  display: inline-block;
  margin-bottom: 8px;
  filter: drop-shadow(0 2px 6px rgba(58, 46, 42, 0.12));
  animation: bob 3.6s ease-in-out infinite;
}

@keyframes bob {
  0%, 100% { transform: translateY(0) rotate(-1deg); }
  50%      { transform: translateY(-4px) rotate(1deg); }
}

.title {
  font-size: 48px;
  font-weight: 800;
  margin: 4px 0 8px;
  letter-spacing: -0.02em;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  margin: 0;
  font-size: 15px;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ========== Tabs ========== */
.tabs {
  display: flex;
  gap: 6px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 5px;
  margin: 0 auto 20px;
  box-shadow: var(--shadow-sm);
  max-width: 480px;
}

.tab {
  flex: 1;
  appearance: none;
  background: transparent;
  border: none;
  padding: 11px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.tab:hover { color: var(--color-text); background: var(--color-bg); }

.tab.is-active {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 2px 6px rgba(200, 115, 88, 0.30);
}

.tab.is-active:hover { background: var(--color-accent-hover); }

.tab:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

/* ========== Panel ========== */
.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: var(--shadow-md);
}

.panel:not(.is-active) { display: none; }

.label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-text);
}

/* ========== ★ 入力エリア textarea (枠つき) ========== */
.editor-textarea {
  display: block;
  width: 100%;
  min-height: 360px;
  max-height: 70vh;
  margin: 0;
  padding: 16px 18px;

  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text);
  background: #ffffff;

  border: 2px solid var(--color-border-strong);
  border-radius: var(--radius);
  outline: none;

  resize: vertical;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  tab-size: 2;
  -moz-tab-size: 2;
  caret-color: var(--color-accent);

  transition: border-color var(--transition), box-shadow var(--transition);
}

.editor-textarea::placeholder {
  color: var(--color-text-soft);
  opacity: 0.7;
}

.editor-textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-bg);
}

/* ========== Code Input (受信タブ) ========== */
.input {
  width: 100%;
  font-family: inherit;
  font-size: 15px;
  color: var(--color-text);
  background: #ffffff;
  border: 2px solid var(--color-border-strong);
  border-radius: var(--radius);
  padding: 14px 16px;
  transition: var(--transition);
}

.input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-bg);
}

.code-input {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.4em;
  text-indent: 0.4em;
  text-transform: uppercase;
  padding: 20px;
  margin-bottom: 24px;
}

.code-input::placeholder {
  letter-spacing: 0.4em;
  color: var(--color-text-soft);
  font-weight: 600;
  opacity: 0.5;
}

.meta-row {
  display: flex;
  justify-content: flex-end;
  margin: 8px 0 16px;
}

.counter {
  font-size: 12px;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}

.counter.is-warn { color: var(--color-error); font-weight: 600; }

/* ========== Buttons ========== */
.btn {
  appearance: none;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

.btn-primary {
  width: 100%;
  padding: 14px 20px;
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 3px 0 var(--color-accent-hover), 0 6px 14px rgba(200, 115, 88, 0.25);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  transform: translateY(1px);
  box-shadow: 0 2px 0 var(--color-accent-hover), 0 4px 10px rgba(200, 115, 88, 0.20);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(3px);
  box-shadow: 0 0 0 var(--color-accent-hover), 0 1px 4px rgba(200, 115, 88, 0.15);
}

.btn-primary:disabled { opacity: 0.55; cursor: not-allowed; box-shadow: none; }

.btn-icon {
  padding: 8px;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border-strong);
  color: var(--color-text-muted);
  flex-shrink: 0;
}

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

/* ========== Result ========== */
.result {
  margin-top: 22px;
  padding: 22px;
  background: var(--color-secondary-bg);
  border: 1.5px dashed var(--color-secondary);
  border-radius: var(--radius);
}

.result.hidden { display: none; }

.result-label {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 12px;
}

.result-header .result-label { margin: 0; }

.code-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 8px 0;
}

.code-text {
  font-family: var(--font-mono);
  font-size: 48px;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: 0.18em;
  user-select: all;
  text-shadow: 0 1px 0 rgba(255,255,255,0.5);
}

.expires {
  margin: 14px 0 0;
  text-align: center;
  font-size: 12px;
  color: var(--color-text-muted);
}

/* プレビュー (送信後) */
.preview-details {
  margin-top: 16px;
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
}

.preview-details summary {
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  padding: 6px 0;
  user-select: none;
  list-style: none;
}

.preview-details summary::before {
  content: "▶";
  display: inline-block;
  margin-right: 6px;
  font-size: 10px;
  transition: transform var(--transition);
}

.preview-details[open] summary::before { transform: rotate(90deg); }
.preview-details summary::-webkit-details-marker { display: none; }

.preview-code,
.received-code-wrapper {
  margin: 10px 0 0;
  padding: 14px 16px;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  max-height: 600px;
  overflow-y: auto;
  tab-size: 2;
  -moz-tab-size: 2;
}

/* ========== HTMLシンタックスハイライト ========== */
.tok-bracket { color: var(--hl-tag-bracket); }
.tok-tag     { color: var(--hl-tag-name); font-weight: 600; }
.tok-attr    { color: var(--hl-attr-name); }
.tok-eq      { color: var(--hl-tag-bracket); }
.tok-value   { color: var(--hl-attr-value); }
.tok-comment { color: var(--hl-comment); font-style: italic; }
.tok-doctype { color: var(--hl-doctype); }
.tok-entity  { color: var(--hl-entity); }

/* ========== Error ========== */
.error {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--color-error-bg);
  color: var(--color-error);
  border: 1.5px solid #f0cfca;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
}

.error::before { content: "⚠"; font-size: 16px; flex-shrink: 0; }
.error.hidden { display: none; }

.footer {
  margin-top: 28px;
  text-align: center;
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.8;
}
.footer p { margin: 2px 0; }

.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #3a2e2a;
  color: #fdf8f0;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease, transform 200ms ease;
  z-index: 100;
  box-shadow: 0 8px 24px rgba(58, 46, 42, 0.25);
}
.toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.hidden { display: none !important; }

@media (max-width: 480px) {
  .container { padding: 20px 14px 48px; }
  .panel { padding: 18px; border-radius: var(--radius); }
  .title { font-size: 36px; }
  .code-text { font-size: 36px; letter-spacing: 0.14em; }
  .code-input { font-size: 22px; padding: 16px; letter-spacing: 0.3em; text-indent: 0.3em; margin-bottom: 20px; }
  .editor-textarea { min-height: 280px; font-size: 13px; padding: 14px; }
  .btn-primary { padding: 13px 18px; }
  .mascot svg { width: 80px; height: 80px; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:           #1f1a17;
    --color-bg-pattern:   #2a2320;
    --color-surface:      #2c2522;
    --color-text:         #f5ead6;
    --color-text-muted:   #b09d8a;
    --color-text-soft:    #6f5e54;
    --color-border:       #3e342f;
    --color-border-strong:#52453e;

    --color-accent:       #e89072;
    --color-accent-hover: #d97a5b;
    --color-accent-bg:    #3a2820;
    --color-secondary:    #4ec9b9;
    --color-secondary-bg: #1c2e2c;

    --color-error:        #e88a82;
    --color-error-bg:     #3a201c;

    --hl-tag-bracket: #808080;
    --hl-tag-name:    #569cd6;
    --hl-attr-name:   #9cdcfe;
    --hl-attr-value:  #ce9178;
    --hl-comment:     #6a9955;
    --hl-doctype:     #808080;
    --hl-entity:      #c586c0;
  }

  body { background-image: radial-gradient(circle at 1px 1px, var(--color-bg-pattern) 1px, transparent 0); }

  .editor-textarea, .input { background: #1a1613; }
  .preview-code, .received-code-wrapper { background: #1a1613; }
}