:root {
  --gb-black: #070907;
  --gb-black-soft: #0d100e;
  --gb-white: #f1f1ec;
  --gb-white-bright: #fafaf7;
  --gb-ink: #111310;
  --gb-muted: #747872;
  --gb-line: rgba(17, 19, 16, 0.2);
  --gb-gold: #d3a642;
  --gb-gold-bright: #f2c760;
  --gb-pad: clamp(1.25rem, 3.2vw, 4rem);
  --gb-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

.guestbook-page { overflow-x: clip; background: var(--gb-black); color: var(--gb-white); }
.guestbook-page [hidden] { display: none !important; }
.guestbook-page .site-header { border-bottom-color: rgba(255, 255, 255, 0.13); background: rgba(7, 9, 7, 0.84); backdrop-filter: blur(18px) saturate(120%); }
.guestbook-page .brand strong { color: var(--gb-white); }
.guestbook-page .brand span { color: var(--gb-gold); }
.guestbook-page .chapter-nav a[aria-current="page"] { color: var(--gb-gold-bright); }

.guestbook-page .guestbook-intro {
  min-height: clamp(12.5rem, 23vw, 19rem);
  padding: clamp(7.5rem, 11vw, 10rem) var(--gb-pad) clamp(2rem, 4vw, 4rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 3rem;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: radial-gradient(circle at 78% 18%, rgba(255, 255, 255, 0.055), transparent 24%), linear-gradient(115deg, #070907 0%, #090b09 62%, #111411 100%);
}

.guestbook-page .guestbook-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.12;
  background-image: repeating-linear-gradient(90deg, transparent 0 18rem, rgba(255,255,255,.12) 18rem calc(18rem + 1px));
  mask-image: linear-gradient(to right, transparent, #000 18%, #000 82%, transparent);
}

.guestbook-intro__copy > p { margin: 0 0 1.35rem; display: flex; align-items: center; gap: 0.75rem; color: var(--gb-gold-bright); font: 700 0.76rem/1 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: 0.16em; }
.guestbook-intro__copy > p b { font-size: 1rem; }
.guestbook-intro__copy > p i { width: 1.8rem; height: 1px; background: currentColor; }
.guestbook-intro__copy h1 { margin: 0; max-width: 10ch; font-size: clamp(2.7rem, 5vw, 5.6rem); line-height: 0.94; letter-spacing: -0.055em; font-weight: 900; }
.guestbook-intro__copy > span { display: block; margin-top: 1.3rem; color: rgba(241, 241, 236, 0.58); font-size: clamp(0.78rem, 1vw, 0.95rem); }

.guestbook-page .guestbook-identity { min-width: min(23rem, 34vw); padding: 0.4rem 0 0.4rem 2rem; border-left: 1px solid rgba(211, 166, 66, 0.58); display: grid; gap: 0.4rem; }
.guestbook-identity small { color: rgba(241, 241, 236, 0.42); font: 600 0.68rem/1 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: 0.16em; }
.guestbook-identity strong { color: var(--gb-gold-bright); font: 700 clamp(1rem, 1.5vw, 1.4rem)/1.2 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: 0.08em; }
.guestbook-identity span { color: rgba(241, 241, 236, 0.42); font-size: 0.72rem; }

.guestbook-page .guestbook-board { min-height: 70svh; padding: 0; background: var(--gb-white); color: var(--gb-ink); }
.guestbook-page .guestbook-board-head { min-height: 5.5rem; padding: 0 var(--gb-pad); display: flex; align-items: flex-end; justify-content: space-between; gap: 2rem; border-bottom: 1px solid var(--gb-line); }
.guestbook-page .guestbook-tabs { display: flex; align-items: flex-end; gap: clamp(1.6rem, 3vw, 3.5rem); }
.guestbook-page .guestbook-tabs button { position: relative; min-height: 4.6rem; padding: 0 0 1.35rem; border: 0; background: none; color: var(--gb-muted); font: 700 clamp(0.95rem, 1.2vw, 1.1rem)/1 sans-serif; cursor: pointer; transition: color 180ms ease; }
.guestbook-page .guestbook-tabs button span { margin-right: 0.55rem; color: var(--gb-gold); font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.guestbook-page .guestbook-tabs button::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; transform: scaleX(0); transform-origin: left; background: var(--gb-gold); transition: transform 260ms var(--gb-ease); }
.guestbook-page .guestbook-tabs button:hover,
.guestbook-page .guestbook-tabs button[aria-selected="true"] { color: var(--gb-ink); }
.guestbook-page .guestbook-tabs button[aria-selected="true"]::after { transform: scaleX(1); }
.guestbook-board-head > p { margin: 0 0 1.2rem; color: var(--gb-muted); font-size: 0.72rem; }

.guestbook-page .guestbook-stage { min-height: clamp(36rem, 67vh, 54rem); padding-top: 0; display: grid; grid-template-columns: minmax(0, 1fr) minmax(28rem, 36vw); transition: grid-template-columns 620ms var(--gb-ease); }
.guestbook-page .guestbook-stage.is-composer-closed { grid-template-columns: minmax(0, 1fr) 4.75rem; }
.guestbook-archive { min-width: 0; padding: clamp(2rem, 4vw, 4.5rem) var(--gb-pad); background: var(--gb-white-bright); }
.guestbook-page .guestbook-list-heading,
.guestbook-system-heading { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 2rem; padding-bottom: clamp(1.5rem, 2.5vw, 2.5rem); }
.guestbook-list-heading small,
.guestbook-system-heading small,
.guestbook-composer-title small { display: block; margin-bottom: 0.65rem; color: var(--gb-gold); font: 700 0.67rem/1 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: 0.15em; }
.guestbook-page .guestbook-list-heading h2,
.guestbook-system-heading h2,
.guestbook-composer-title h2 { margin: 0; font-size: clamp(1.85rem, 3vw, 3.2rem); line-height: 0.98; letter-spacing: -0.045em; }
.guestbook-list-heading button,
.guestbook-system-heading button { border: 0; padding: 0.7rem 0; background: none; color: var(--gb-ink); font: inherit; cursor: pointer; }
.guestbook-list-heading button span,
.guestbook-system-heading button span { margin-right: 0.55rem; font-size: 1.25em; display: inline-block; transition: transform 300ms var(--gb-ease); }
.guestbook-list-heading button:hover span,
.guestbook-system-heading button:hover span { transform: rotate(150deg); color: var(--gb-gold); }
.guestbook-list { border-top: 1px solid var(--gb-line); }

.guestbook-page .guestbook-message { min-height: 8.4rem; display: grid; grid-template-columns: 4.5rem minmax(0, 1fr) minmax(8rem, auto); align-items: center; gap: clamp(1rem, 2vw, 2.25rem); border-bottom: 1px solid var(--gb-line); opacity: 0; transform: translateY(1rem); animation: guestbook-entry 620ms var(--gb-ease) var(--entry-delay, 0ms) forwards; }
.guestbook-page .guestbook-message > span { color: var(--gb-gold); font: 500 clamp(1.65rem, 2.8vw, 2.8rem)/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.guestbook-message > div { min-width: 0; }
.guestbook-message strong { display: block; margin-bottom: 0.55rem; font-size: clamp(0.94rem, 1.15vw, 1.08rem); }
.guestbook-message p { margin: 0; color: #333630; font-size: clamp(0.9rem, 1.18vw, 1.08rem); line-height: 1.7; overflow-wrap: anywhere; }
.guestbook-page .guestbook-message > time { justify-self: end; color: var(--gb-muted); font: 500 0.72rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; text-align: right; }
.guestbook-empty { margin: 0; padding: 4rem 0; border-top: 1px solid var(--gb-line); color: var(--gb-muted); }

.guestbook-composer { min-width: 0; display: grid; grid-template-columns: 4.75rem minmax(0, 1fr); position: relative; overflow: hidden; color: var(--gb-white); background: var(--gb-black); }
.guestbook-composer-rail { position: relative; z-index: 2; border-left: 1px solid rgba(211, 166, 66, 0.58); border-right: 1px solid rgba(255, 255, 255, 0.08); background: var(--gb-black); }
.guestbook-composer-rail button { width: 100%; min-height: 12rem; padding: 1.1rem 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1rem; border: 0; color: var(--gb-gold-bright); background: transparent; cursor: pointer; }
.guestbook-composer-rail button span { font-size: 1.6rem; transition: transform 260ms var(--gb-ease); }
.guestbook-composer-rail button:hover span { transform: translateX(0.3rem); }
.guestbook-composer-rail button b { writing-mode: vertical-rl; letter-spacing: 0.25em; font-size: 0.82rem; }
.guestbook-composer-panel { min-width: 23rem; padding: clamp(2.5rem, 4vw, 4.5rem) clamp(2rem, 3vw, 3.5rem); position: relative; opacity: 1; transform: translateX(0); transition: opacity 260ms ease 160ms, transform 540ms var(--gb-ease); }
.is-composer-closed .guestbook-composer-panel { opacity: 0; pointer-events: none; transform: translateX(2rem); transition-delay: 0ms; }
.guestbook-composer-close { position: absolute; top: 1.4rem; right: 1.5rem; width: 2.75rem; height: 2.75rem; border: 1px solid rgba(255, 255, 255, 0.18); border-radius: 50%; color: rgba(255, 255, 255, 0.62); background: transparent; font-size: 1.7rem; font-weight: 200; cursor: pointer; transition: color 180ms ease, border-color 180ms ease, transform 280ms var(--gb-ease); }
.guestbook-composer-close:hover { color: var(--gb-gold-bright); border-color: var(--gb-gold); transform: rotate(90deg); }
.guestbook-composer-title { padding-right: 3rem; }
.guestbook-composer-title p { margin: 1rem 0 0; max-width: 34rem; color: rgba(241,241,236,.46); font-size: 0.75rem; line-height: 1.7; }

.guestbook-page .guestbook-form { margin: clamp(2rem, 4vw, 4rem) 0 0; padding: 0; display: grid; grid-template-columns: 1fr; gap: 1.4rem; border: 0; }
.guestbook-form label { display: grid; gap: 0.7rem; }
.guestbook-form label > span { color: rgba(241,241,236,.78); font-size: 0.78rem; font-weight: 700; }
.guestbook-form label > span small { margin-left: 0.35rem; color: rgba(241,241,236,.38); font-weight: 400; }
.guestbook-page .guestbook-name-field { display: grid; gap: .7rem; }
.guestbook-page .guestbook-message-field { min-height: 0; display: grid; grid-template-rows: auto 1fr; gap: .7rem; padding: 0; }
.guestbook-page .guestbook-form input,
.guestbook-page .guestbook-form textarea { width: 100%; border: 1px solid rgba(255,255,255,.22); border-radius: 2px; outline: 0; background: rgba(255,255,255,.025); color: var(--gb-white); font: inherit; transition: border-color 180ms ease, background-color 180ms ease; }
.guestbook-page .guestbook-name-field input { min-height: 3.25rem; padding: 0 1rem; border: 1px solid rgba(255,255,255,.22); background: rgba(255,255,255,.025); font-size: inherit; font-weight: 400; }
.guestbook-page .guestbook-message-field textarea { min-height: clamp(10rem, 24vh, 15rem); padding: 1rem 1rem 2.3rem; border: 1px solid rgba(255,255,255,.22); background: rgba(255,255,255,.025); font-size: inherit; line-height: 1.7; resize: vertical; }
.guestbook-form input::placeholder,
.guestbook-form textarea::placeholder { color: rgba(241,241,236,.3); }
.guestbook-page .guestbook-form input:focus,
.guestbook-page .guestbook-form textarea:focus { border-color: var(--gb-gold); background: rgba(211,166,66,.035); box-shadow: 0 0 0 2px rgba(211,166,66,.12); }
.guestbook-page .guestbook-form textarea[aria-invalid="true"] { border-color: #ef8f78; box-shadow: 0 0 0 2px rgba(239,143,120,.1); }
.guestbook-message-field { position: relative; }
.guestbook-message-field > small { position: absolute; right: 1rem; bottom: 0.9rem; color: rgba(241,241,236,.4); font: 500 0.68rem/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.guestbook-privacy { margin: -0.1rem 0 0; display: flex; align-items: center; gap: 0.65rem; color: rgba(241,241,236,.42); font-size: 0.7rem; line-height: 1.6; }
.guestbook-privacy span { color: var(--gb-gold); }
.guestbook-page .guestbook-submit { width: 100%; min-height: 3.8rem; padding: 0 1rem; position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center; gap: 1rem; border: 1px solid var(--gb-gold); border-radius: 2px; background: transparent; color: var(--gb-gold-bright); font: 700 1rem/1 sans-serif; cursor: pointer; transition: color 220ms ease, background-color 220ms ease; }
.guestbook-page .guestbook-submit:hover { color: var(--gb-black); background: var(--gb-gold-bright); }
.guestbook-submit b { transition: transform 260ms var(--gb-ease); }
.guestbook-submit:hover b { transform: translate(0.25rem, -0.2rem); }
.guestbook-submit:disabled { cursor: wait; opacity: 0.5; }
.guestbook-page .guestbook-form-status { grid-column: auto; min-height: 1.25rem; margin: -0.3rem 0 0; padding: 0; font-size: 0.75rem; color: rgba(241,241,236,.5); }
.guestbook-form-status[data-state="success"] { color: #d9c47f; }
.guestbook-form-status[data-state="error"] { color: #ef8f78; }
.guestbook-spark { position: absolute; z-index: 4; width: 4px; height: 4px; border-radius: 50%; pointer-events: none; background: #fff1a8; box-shadow: 0 0 10px 3px rgba(242,199,96,.75); animation: guestbook-spark 540ms ease-out forwards; }
.guestbook-mobile-compose { display: none; }

.guestbook-page .guestbook-system-panel { min-height: 38rem; padding: clamp(2.5rem, 5vw, 5.5rem) var(--gb-pad); background: var(--gb-white-bright); }
.guestbook-system-heading { grid-template-columns: minmax(14rem, .6fr) 1fr auto; border-bottom: 1px solid var(--gb-line); }
.guestbook-system-heading > p { max-width: 38rem; margin: 0; color: var(--gb-muted); font-size: 0.78rem; line-height: 1.75; }
.visitor-list { max-width: 90rem; }
.visitor-day { padding: 2.5rem 0; border-bottom: 1px solid var(--gb-line); opacity: 0; transform: translateY(1rem); animation: guestbook-entry 620ms var(--gb-ease) var(--entry-delay, 0ms) forwards; }
.visitor-day > header { display: flex; align-items: baseline; justify-content: space-between; gap: 2rem; margin-bottom: 1.3rem; }
.visitor-day > header h3 { margin: 0; font-size: 1.2rem; }
.visitor-day > header span { color: var(--gb-gold); font: 600 .72rem/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.visitor-day article { min-height: 3.2rem; display: grid; grid-template-columns: 7rem 11rem 1fr; align-items: center; gap: 1rem; border-top: 1px solid rgba(17,19,16,.1); }
.visitor-day article time,
.visitor-day article span { color: var(--gb-muted); font-size: 0.78rem; }
.visitor-day article strong { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }

@keyframes guestbook-entry { to { opacity: 1; transform: translateY(0); } }
@keyframes guestbook-spark { to { opacity: 0; transform: rotate(var(--spark-angle)) translateX(2rem) scale(.25); } }

@media (max-width: 1100px) {
  .guestbook-page .guestbook-stage { grid-template-columns: minmax(0, 1fr) minmax(24rem, 40vw); }
  .guestbook-page .guestbook-message { grid-template-columns: 3.5rem minmax(0, 1fr); padding: 1.7rem 0; }
  .guestbook-message time { grid-column: 2; justify-self: start; margin-top: -0.5rem; }
}

@media (max-width: 860px) {
  .guestbook-page .contact-button { display: none; }
  .guestbook-page .guestbook-intro { min-height: 19rem; padding-top: 7.5rem; grid-template-columns: 1fr; align-content: end; gap: 1.5rem; }
  .guestbook-page .guestbook-identity { grid-column: 1; width: 100%; min-width: 0; padding-left: 1rem; }
  .guestbook-identity span { display: none; }
  .guestbook-page .guestbook-board-head { min-height: 4.8rem; align-items: flex-end; }
  .guestbook-board-head > p { display: none; }
  .guestbook-page .guestbook-tabs { width: auto; min-width: 0; }
  .guestbook-page .guestbook-tabs button { min-height: 4rem; padding-bottom: 1.1rem; }
  .guestbook-page .guestbook-stage,
  .guestbook-page .guestbook-stage.is-composer-closed { display: block; min-height: 34rem; }
  .guestbook-archive { padding-bottom: 7rem; }
  .guestbook-page .guestbook-message { grid-template-columns: 2.8rem minmax(0, 1fr); }
  .guestbook-page .guestbook-message > span { font-size: 1.55rem; }
  .guestbook-page .guestbook-message > time { grid-column: 2; justify-self: start; text-align: left; }
  .guestbook-mobile-compose { position: fixed; right: 1rem; bottom: 1.2rem; left: 1rem; z-index: 1100; width: auto; min-height: 3.25rem; padding: 0 1.2rem; display: flex; align-items: center; justify-content: center; gap: .8rem; border: 1px solid var(--gb-gold); border-radius: 2px; background: rgba(7,9,7,.92); color: var(--gb-gold-bright); backdrop-filter: blur(12px); font-weight: 700; }
  .guestbook-composer { position: fixed; inset: 0; z-index: 2100; display: block; overflow-y: auto; transform: translateY(0); transition: transform 540ms var(--gb-ease), visibility 0s linear 0s; }
  .is-composer-closed .guestbook-composer { visibility: hidden; transform: translateY(100%); transition: transform 460ms var(--gb-ease), visibility 0s linear 460ms; }
  .guestbook-composer-rail { display: none; }
  .guestbook-composer-panel { min-width: 0; min-height: 100%; padding: 5.5rem 1.25rem 2.5rem; opacity: 1; transform: none; }
  .is-composer-closed .guestbook-composer-panel { opacity: 1; transform: none; }
  .guestbook-composer-open { overflow: hidden; }
  .guestbook-system-heading { grid-template-columns: 1fr auto; }
  .guestbook-system-heading > p { grid-column: 1 / -1; grid-row: 2; }
  .visitor-day article { grid-template-columns: 5rem 1fr; padding: .85rem 0; }
  .visitor-day article span { grid-column: 2; }
}

@media (max-width: 560px) {
  .guestbook-intro__copy h1 { font-size: clamp(2.4rem, 13vw, 4rem); }
  .guestbook-page .guestbook-list-heading { gap: 1rem; }
  .guestbook-list-heading button { font-size: .72rem; }
  .guestbook-page .guestbook-message { min-height: 0; padding: 1.55rem 0; gap: .8rem; }
  .guestbook-message p { font-size: .9rem; }
  .guestbook-message time { font-size: .66rem; }
  .guestbook-system-panel { padding-bottom: 6rem; }
}

@media (prefers-reduced-motion: reduce) {
  .guestbook-page *, .guestbook-page *::before, .guestbook-page *::after { scroll-behavior: auto !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}