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

:root {
  --bg: #0c0e14;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-hover: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.08);
  --text: #e8eaef;
  --text-muted: #8b919e;
  --accent: #6c9eff;
  --accent-glow: rgba(108, 158, 255, 0.25);
  --accent-soft: rgba(108, 158, 255, 0.12);
  --radius: 16px;
  --font: "Outfit", system-ui, sans-serif;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  height: 100vh;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  z-index: 0;
}

.bg-glow--1 {
  width: 500px;
  height: 500px;
  background: rgba(108, 158, 255, 0.08);
  top: -150px;
  right: -100px;
}

.bg-glow--2 {
  width: 400px;
  height: 400px;
  background: rgba(140, 100, 255, 0.06);
  bottom: -100px;
  left: -100px;
}

.header,
.main,
.footer {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 960px;
  padding-left: 24px;
  padding-right: 24px;
}

.header {
  flex-shrink: 0;
  padding-top: 36px;
  padding-bottom: 20px;
  text-align: center;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.logo__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--accent), #8b6cff);
  border-radius: 12px;
  font-weight: 700;
  font-size: 1.25rem;
  color: #fff;
  box-shadow: 0 4px 24px var(--accent-glow);
}

.logo__text {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.tagline {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 300;
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 0;
  padding-bottom: 24px;
}

.panel {
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  min-width: 0;
  min-height: 0;
}

.panel--links {
  flex: 7 1 0;
  border-color: rgba(108, 158, 255, 0.18);
  box-shadow: inset 0 1px 0 rgba(108, 158, 255, 0.08);
}

.panel--guestbook {
  flex: 3 1 0;
  border-color: rgba(140, 100, 255, 0.18);
  box-shadow: inset 0 1px 0 rgba(140, 100, 255, 0.08);
}

.panel--guestbook.is-collapsed {
  flex: 0 0 auto;
}

.main:has(.panel--guestbook.is-collapsed) .panel--links {
  flex: 1 1 0;
}

.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.22);
}

.panel__head-main {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.panel__title {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
}

.panel__subtitle {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.01em;
}

.panel__body {
  flex: 1;
  min-height: 0;
  padding: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.panel--links .panel__body {
  overflow-y: auto;
}

.panel--guestbook.is-collapsed .panel__body {
  display: none;
}

.panel--guestbook.is-collapsed .panel__head {
  border-bottom: none;
}

.panel__collapse {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.72rem;
  font-weight: 500;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.panel__collapse:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  border-color: rgba(140, 100, 255, 0.35);
}

.panel__collapse-icon {
  width: 14px;
  height: 14px;
  transition: transform 0.25s ease;
}

.panel--guestbook.is-collapsed .panel__collapse-icon {
  transform: rotate(-90deg);
}

.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.tools-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 400px), 1fr));
  gap: 10px;
}

.tools-loading,
.tools-empty,
.tools-error {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-muted);
  padding: 32px 16px;
}

.tools-error {
  color: #ff8a8a;
}

.tools-loading,
.tools-empty,
.tools-error {
  grid-column: 1 / -1;
}

.tool-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  padding: 12px 14px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.tool-card:hover {
  background: var(--surface-hover);
  border-color: rgba(108, 158, 255, 0.25);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.3);
  transform: translateY(-1px);
}

.tool-card__icon {
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  border: 1px solid rgba(108, 158, 255, 0.18);
  border-radius: 12px;
  color: var(--accent);
}

.tool-card--site .tool-card__icon {
  background: rgba(140, 100, 255, 0.12);
  border-color: rgba(140, 100, 255, 0.22);
  color: #a98bff;
}

.tool-card__icon svg {
  width: 24px;
  height: 24px;
}

.tool-card__body {
  min-width: 0;
}

.tool-card__header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 3px;
  min-width: 0;
}

.tool-card__title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.tool-card__badge {
  flex-shrink: 0;
  font-size: 0.65rem;
  font-weight: 500;
  padding: 2px 7px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-muted);
}

.tool-card__desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tool-card__meta {
  display: flex;
  gap: 12px;
  margin-top: 4px;
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.7rem;
  color: var(--text-muted);
  opacity: 0.85;
}

.meta-item svg {
  width: 12px;
  height: 12px;
  opacity: 0.7;
}

.tool-card__download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  background: linear-gradient(135deg, var(--accent), #5a82e0);
  color: #fff;
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 10px;
  white-space: nowrap;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.tool-card__download--site {
  background: rgba(140, 100, 255, 0.14);
  border: 1px solid rgba(140, 100, 255, 0.35);
  color: #c4b0ff;
  box-shadow: none;
}

.tool-card__download--site:hover {
  background: rgba(140, 100, 255, 0.24);
}

.tool-card__download svg {
  width: 16px;
  height: 16px;
}

.tool-card__download:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

.tool-card__download:active {
  transform: translateY(0);
}

.guestbook-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  scrollbar-gutter: stable;
  padding-right: 2px;
}

.guestbook-compose {
  margin-top: 12px;
  flex-shrink: 0;
}

.guestbook-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.guestbook-toggle:hover:not(:disabled) {
  background: var(--surface-hover);
  border-color: rgba(108, 158, 255, 0.25);
  color: var(--text);
}

.guestbook-toggle:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.guestbook-toggle__icon {
  width: 16px;
  height: 16px;
  color: var(--accent);
  transition: transform 0.2s ease;
}

.guestbook-form-wrap {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  margin-top: 0;
  pointer-events: none;
  transition: max-height 0.3s ease, opacity 0.25s ease, margin-top 0.3s ease;
}

.guestbook-form-wrap.is-open {
  max-height: 520px;
  opacity: 1;
  margin-top: 12px;
  pointer-events: auto;
}

.guestbook-loading,
.guestbook-empty,
.guestbook-error {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-muted);
  padding: 24px 16px;
}

.guestbook-error {
  color: #ff8a8a;
}

.guestbook-entry {
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

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

.guestbook-entry__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.guestbook-entry__delete-btn,
.guestbook-entry__copy-btn {
  padding: 4px 10px;
  background: transparent;
  border-radius: 6px;
  font-family: var(--font);
  font-size: 0.7rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.guestbook-entry__copy-btn {
  border: 1px solid rgba(108, 158, 255, 0.35);
  color: var(--accent);
}

.guestbook-entry__copy-btn:hover {
  background: rgba(108, 158, 255, 0.1);
  border-color: rgba(108, 158, 255, 0.55);
}

.guestbook-entry__copy-btn--done {
  color: #7dcea0;
  border-color: rgba(125, 206, 160, 0.45);
  background: rgba(125, 206, 160, 0.1);
}

.guestbook-entry__delete-btn {
  border: 1px solid rgba(255, 138, 138, 0.35);
  color: #ff8a8a;
}

.guestbook-entry__delete-btn:hover {
  background: rgba(255, 138, 138, 0.1);
  border-color: rgba(255, 138, 138, 0.55);
}

.guestbook-entry__delete {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.guestbook-entry__delete[hidden] {
  display: none;
}

.guestbook-entry__pin {
  width: 120px;
  padding: 8px 10px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.8rem;
}

.guestbook-entry__pin:focus {
  outline: none;
  border-color: rgba(255, 138, 138, 0.4);
}

.guestbook-entry__confirm,
.guestbook-entry__cancel {
  padding: 8px 12px;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
}

.guestbook-entry__confirm {
  background: rgba(255, 138, 138, 0.15);
  color: #ff8a8a;
  border: 1px solid rgba(255, 138, 138, 0.35);
}

.guestbook-entry__confirm:hover:not(:disabled) {
  background: rgba(255, 138, 138, 0.25);
}

.guestbook-entry__confirm:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.guestbook-entry__cancel {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.guestbook-entry__delete-msg {
  width: 100%;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.guestbook-entry__delete-msg--success {
  color: #7dcea0;
}

.guestbook-entry__delete-msg--error {
  color: #ff8a8a;
}

.guestbook-label__sub {
  font-weight: 400;
  opacity: 0.75;
}

.guestbook-entry__name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

.guestbook-entry__date {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.guestbook-entry__message {
  font-size: 0.875rem;
  color: var(--text);
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
}

.guestbook-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.guestbook-hp {
  position: absolute;
  left: -9999px;
  opacity: 0;
  height: 0;
  width: 0;
  pointer-events: none;
}

.guestbook-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.guestbook-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}

.guestbook-field input,
.guestbook-field textarea {
  width: 100%;
  padding: 10px 12px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.875rem;
  transition: border-color 0.15s;
  resize: vertical;
}

.guestbook-field input:focus,
.guestbook-field textarea:focus {
  outline: none;
  border-color: rgba(108, 158, 255, 0.4);
}

.guestbook-field input:disabled,
.guestbook-field textarea:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.guestbook-form__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.guestbook-submit {
  padding: 10px 20px;
  background: linear-gradient(135deg, var(--accent), #5a82e0);
  color: #fff;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.guestbook-submit:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

.guestbook-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.guestbook-cancel {
  padding: 10px 16px;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.guestbook-cancel:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

.guestbook-cancel:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.guestbook-status {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.guestbook-status--success {
  color: #7dcea0;
}

.guestbook-status--error {
  color: #ff8a8a;
}

.guestbook-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.footer {
  flex-shrink: 0;
  padding-bottom: 20px;
  text-align: center;
}

.footer p {
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.6;
}

/* 모바일·낮은 화면: 한 화면에 고정하지 않고 페이지 전체를 스크롤 */
@media (max-width: 768px), (max-height: 640px) {
  body {
    height: auto;
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    overflow-y: auto;
  }

  .bg-glow--1 {
    width: 320px;
    height: 320px;
  }

  .bg-glow--2 {
    width: 280px;
    height: 280px;
  }

  .main {
    flex: 0 0 auto;
  }

  .panel--links,
  .panel--guestbook,
  .main:has(.panel--guestbook.is-collapsed) .panel--links {
    flex: 0 0 auto;
  }

  .panel--links .panel__body {
    overflow: visible;
  }

  .guestbook-list {
    flex: 0 0 auto;
    min-height: 120px;
    max-height: 60vh;
    max-height: 60dvh;
    overscroll-behavior: contain;
  }
}

@media (max-width: 600px) {
  .header,
  .main,
  .footer {
    padding-left: 16px;
    padding-right: 16px;
  }

  .header {
    padding-top: 24px;
    padding-bottom: 16px;
  }

  .logo__mark {
    width: 38px;
    height: 38px;
    font-size: 1.1rem;
  }

  .logo__text {
    font-size: 1.5rem;
  }

  .tagline {
    font-size: 0.875rem;
  }

  .main {
    gap: 12px;
    padding-bottom: 16px;
  }

  .panel__head {
    padding: 12px 14px;
  }

  .panel__body {
    padding: 12px;
  }

  .panel__collapse {
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  .tools-list {
    gap: 8px;
  }

  .tool-card {
    gap: 12px;
    padding: 10px 10px 10px 12px;
  }

  .tool-card__icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
  }

  .tool-card__icon svg {
    width: 22px;
    height: 22px;
  }

  .tool-card__header {
    flex-wrap: wrap;
    row-gap: 2px;
  }

  .tool-card__title {
    font-size: 0.95rem;
    white-space: normal;
    word-break: keep-all;
  }

  .tool-card__desc {
    font-size: 0.78rem;
    white-space: normal;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    line-clamp: 2;
  }

  .tool-card__meta {
    display: none;
  }

  /* 버튼은 아이콘만 (글자는 스크린리더용 aria-label) */
  .tool-card__download {
    width: 42px;
    height: 42px;
    padding: 0;
    justify-content: center;
  }

  .tool-card__download-label {
    display: none;
  }

  .tool-card__download svg {
    width: 20px;
    height: 20px;
  }

  .guestbook-entry {
    padding: 14px;
  }

  .guestbook-entry__name {
    font-size: 1rem;
  }

  .guestbook-entry__message {
    font-size: 0.95rem;
  }

  .guestbook-entry__delete-btn,
  .guestbook-entry__copy-btn {
    padding: 6px 12px;
    font-size: 0.8rem;
  }

  /* iOS 입력 시 자동 확대 방지 (16px 이상) */
  .guestbook-field input,
  .guestbook-field textarea,
  .guestbook-entry__pin {
    font-size: 16px;
  }

  .guestbook-toggle,
  .guestbook-submit,
  .guestbook-cancel {
    padding: 12px 16px;
    font-size: 0.95rem;
  }

  .guestbook-entry__head {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .guestbook-entry__actions {
    width: 100%;
    justify-content: space-between;
  }

  .guestbook-entry__delete {
    flex-direction: column;
    align-items: stretch;
  }

  .guestbook-entry__pin {
    width: 100%;
  }

  .guestbook-form__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .guestbook-submit {
    width: 100%;
  }
}