/* ============================================
   Elaprase Dose Calculator — Modern Dark UI
   ============================================ */

/* --- Fonts --- */
@font-face { font-family: gothamBold;   src: url("font/Gotham-Bold.otf"); }
@font-face { font-family: gothamBlack;  src: url("font/Gotham-Black.otf"); }
@font-face { font-family: GothamBook;   src: url("font/GothamBook.ttf"); }
@font-face { font-family: GothamMedium; src: url("font/GothamMedium.ttf"); }

/* --- Tokens --- */
:root {
  --primary:      #0e3950;
  --primary-deep: #f5f7fa;
  --accent:       #2099d6;
  --accent-light: #2099d6;
  --accent-glow:  rgba(32, 153, 214, .2);
  --danger:       #e30613;
  --danger-glow:  rgba(227, 6, 19, .15);
  --surface:      rgba(14, 57, 80, .04);
  --surface-solid:#eef2f5;
  --glass:        rgba(255, 255, 255, .7);
  --glass-border: rgba(14, 57, 80, .1);
  --glass-heavy:  rgba(255, 255, 255, .85);
  --text:         #0e3950;
  --text-dim:     rgba(14, 57, 80, .65);
  --text-muted:   rgba(14, 57, 80, .4);

  --ff-bold:   "gothamBold", system-ui, sans-serif;
  --ff-medium: "GothamMedium", system-ui, sans-serif;
  --ff-book:   "GothamBook", system-ui, sans-serif;

  --radius-sm:  8px;
  --radius-md:  16px;
  --radius-lg:  24px;
  --radius-xl:  32px;
  --radius-pill: 100px;

  --transition: 300ms cubic-bezier(.4, 0, .2, 1);
  --transition-fast: 150ms ease;
  --transition-slow: 500ms cubic-bezier(.4, 0, .2, 1);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--ff-book);
  background: var(--primary-deep);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

/* ===========================
   BACKGROUND — Animated mesh
   =========================== */
.bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}
.bg__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: .4;
  animation: orbFloat 20s ease-in-out infinite alternate;
}
.bg__orb--1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(32,153,214,.15) 0%, transparent 70%);
  top: -10%; left: -10%;
  animation-duration: 18s;
}
.bg__orb--2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(14,57,80,.1) 0%, transparent 70%);
  bottom: -15%; right: -10%;
  animation-duration: 22s;
  animation-delay: -5s;
}
.bg__orb--3 {
  width: 350px; height: 350px;
  background: radial-gradient(circle, rgba(32,153,214,.1) 0%, transparent 70%);
  top: 50%; left: 60%;
  opacity: .3;
  animation-duration: 25s;
  animation-delay: -10s;
}
/* Subtle grid pattern */
.bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(14,57,80,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,57,80,.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

@keyframes orbFloat {
  0%   { transform: translate(0, 0) scale(1); }
  33%  { transform: translate(30px, -40px) scale(1.05); }
  66%  { transform: translate(-20px, 20px) scale(.95); }
  100% { transform: translate(10px, -10px) scale(1.02); }
}

/* ===========================
   LOGO BAR — White background (Takeda brand compliance)
   =========================== */
.logo-bar {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 24px;
  background: #ffffff;
}
.logo-bar__img {
  width: 110px;
  display: block;
}

/* ===========================
   LAYOUT WRAPPER
   =========================== */
.app {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 40px 20px 0;
}

/* ===========================
   HEADER
   =========================== */
.header {
  text-align: center;
  margin-bottom: 40px;
  animation: fadeDown 600ms ease both;
}
.header__title {
  font-family: var(--ff-bold);
  font-size: clamp(1.6rem, 4vw + .5rem, 2.8rem);
  line-height: 1.2;
  letter-spacing: -0.5px;
}
.header__title .line1 {
  color: var(--text);
}
.header__title .line2 {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.header__reg {
  font-size: .45em;
  vertical-align: super;
  -webkit-text-fill-color: var(--text);
  opacity: .6;
}
.header__sub {
  font-family: var(--ff-book);
  font-size: clamp(.8rem, 1.2vw, 1rem);
  color: var(--text-dim);
  margin-top: 8px;
  letter-spacing: .5px;
}

/* ===========================
   GLASS CARD — Calculator
   =========================== */
.card {
  width: 100%;
  max-width: 520px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 40px 36px;
  backdrop-filter: blur(40px);
  -webkit-backdrop-filter: blur(40px);
  box-shadow:
    0 8px 32px rgba(14,57,80,.08),
    0 1px 3px rgba(14,57,80,.06);
  animation: fadeUp 600ms ease 100ms both;
}

/* --- Label --- */
.field__label {
  display: block;
  font-family: var(--ff-medium);
  font-size: clamp(.85rem, 1.2vw, 1rem);
  color: var(--text-dim);
  margin-bottom: 12px;
  letter-spacing: .3px;
}

/* --- Input row --- */
.field__row {
  display: flex;
  align-items: stretch;
  gap: 0;
  background: var(--surface);
  border: 2px solid var(--glass-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.field__row:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow), 0 0 30px -5px var(--accent-glow);
}
.field__row.is-error {
  border-color: var(--danger);
  box-shadow: 0 0 0 4px var(--danger-glow);
  animation: shake .4s ease;
}

.field__input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--ff-bold);
  font-size: clamp(1.2rem, 2.5vw, 1.75rem);
  color: var(--text);
  padding: 16px 20px;
  min-width: 0;
}
.field__input::placeholder {
  color: var(--text-muted);
  font-family: var(--ff-book);
  font-size: clamp(.85rem, 1.2vw, 1rem);
}
.field__input::-webkit-outer-spin-button,
.field__input::-webkit-inner-spin-button { -webkit-appearance: none; }
.field__input[type=number] { -moz-appearance: textfield; }

.field__unit {
  display: flex;
  align-items: center;
  padding: 0 20px;
  background: linear-gradient(135deg, var(--accent) 0%, #1a7fb8 100%);
  font-family: var(--ff-bold);
  font-size: clamp(.9rem, 1.3vw, 1.1rem);
  color: #ffffff;
  letter-spacing: 1px;
  user-select: none;
}

/* --- Button --- */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  margin-top: 24px;
  padding: 18px 32px;
  border: none;
  border-radius: var(--radius-pill);
  font-family: var(--ff-bold);
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  color: #ffffff;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  background: linear-gradient(135deg, var(--accent) 0%, #1565a0 100%);
  box-shadow: 0 4px 20px var(--accent-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition);
}
.btn:hover {
  transform: translateY(-3px) scale(1.01);
  box-shadow: 0 8px 30px var(--accent-glow);
}
.btn:active {
  transform: translateY(0) scale(.99);
  box-shadow: 0 2px 8px var(--accent-glow);
}
/* Shine sweep */
.btn::before {
  content: "";
  position: absolute;
  top: 0; left: -100%; width: 100%; height: 100%;
  background: linear-gradient(105deg, transparent 40%, rgba(255,255,255,.2) 50%, transparent 60%);
  transition: left .6s ease;
}
.btn:hover::before { left: 100%; }

.btn__icon {
  display: inline-flex;
  transition: transform var(--transition-fast);
}
.btn:hover .btn__icon { transform: translateX(4px); }

/* ===========================
   RESULTS
   =========================== */
.results {
  width: 100%;
  max-width: 520px;
  margin-top: 28px;
}
.results[hidden] { display: none; }

.results__card {
  background: linear-gradient(145deg, #0e3950 0%, #15496b 100%);
  border: none;
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  text-align: center;
  box-shadow: 0 8px 40px rgba(14,57,80,.18);
  animation: scaleIn .4s cubic-bezier(.34,1.56,.64,1) both;
  position: relative;
  overflow: hidden;
  color: #ffffff;
}
/* Top glow line */
.results__card::before {
  content: "";
  position: absolute;
  top: 0; left: 10%; right: 10%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  border-radius: 2px;
}

.results__label {
  font-family: var(--ff-medium);
  font-size: clamp(.8rem, 1.1vw, .95rem);
  color: rgba(255,255,255,.65);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.results__grid {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 24px;
}

.results__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.results__value {
  font-family: var(--ff-bold);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  line-height: 1;
  background: linear-gradient(135deg, #4fc3f7 0%, #81d4fa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.results__unit {
  font-family: var(--ff-book);
  font-size: clamp(.7rem, 1vw, .85rem);
  color: rgba(255,255,255,.5);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

/* Divider between items */
.results__divider {
  width: 1px;
  align-self: stretch;
  background: linear-gradient(180deg, transparent, rgba(255,255,255,.15), transparent);
}

.results__warning {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: var(--radius-pill);
  background: rgba(227, 6, 19, .2);
  border: 1px solid rgba(227, 6, 19, .35);
  font-family: var(--ff-medium);
  font-size: clamp(.75rem, 1vw, .85rem);
  color: #ff8a8a;
  letter-spacing: .5px;
  animation: fadeUp .4s ease .15s both;
}
.results__warning-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--danger);
  animation: pulse 2s ease infinite;
}

/* ===========================
   ACCORDION — Details
   =========================== */
.details {
  width: 100%;
  max-width: 520px;
  margin-top: 16px;
}
.details[hidden] { display: none; }

.details__trigger {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px 24px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: var(--text-dim);
  font-family: var(--ff-medium);
  font-size: clamp(.8rem, 1vw, .9rem);
  letter-spacing: .5px;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.details__trigger:hover {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}
.details__trigger[aria-expanded="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.details__chevron {
  width: 16px; height: 16px;
  transition: transform .35s cubic-bezier(.4,0,.2,1);
  flex-shrink: 0;
}
.details__trigger[aria-expanded="true"] .details__chevron {
  transform: rotate(180deg);
}

.details__panel {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height .4s cubic-bezier(.4,0,.2,1), opacity .3s ease;
}
.details__panel.is-open {
  opacity: 1;
}

.details__inner {
  padding: 24px 0 8px;
}

/* Formula box — replaces pic1.png */
.formula-box {
  width: 100%;
  max-width: 480px;
  margin: 0 auto 28px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #0e3950;
  box-shadow: 0 4px 16px rgba(14,57,80,.15);
}
.formula-box__header {
  background: linear-gradient(135deg, var(--accent) 0%, #1a7fb8 100%);
  color: #ffffff;
  font-family: var(--ff-bold);
  font-size: clamp(.9rem, 1.2vw, 1.05rem);
  text-align: center;
  padding: 10px 16px;
  letter-spacing: .5px;
}
.formula-box__body {
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Each formula row: fraction = result */
.formula-row {
  display: flex;
  align-items: center;
  gap: 16px;
}
.fraction {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 0;
  flex: 1;
}
.fraction__num {
  font-family: var(--ff-bold);
  font-size: clamp(.72rem, .95vw, .88rem);
  color: #ffffff;
  text-align: center;
  padding-bottom: 6px;
  border-bottom: 2px solid rgba(255,255,255,.4);
  width: 100%;
}
.fraction__den {
  font-family: var(--ff-bold);
  font-size: clamp(.72rem, .95vw, .88rem);
  color: #ffffff;
  text-align: center;
  padding-top: 6px;
}
.formula-row__eq {
  font-family: var(--ff-bold);
  font-size: clamp(1.2rem, 1.5vw, 1.4rem);
  color: #ffffff;
  flex-shrink: 0;
}
.formula-row__result {
  font-family: var(--ff-bold);
  font-size: clamp(.72rem, .95vw, .88rem);
  color: #ffffff;
  flex: 1;
  line-height: 1.4;
}

@media (max-width: 390px) {
  .formula-box__body { padding: 16px 12px; gap: 18px; }
  .formula-row { gap: 10px; }
}

/* Info blocks */
.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}
.info-card {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 20px;
}
.info-card__title {
  font-family: var(--ff-bold);
  font-size: clamp(.78rem, 1vw, .9rem);
  color: var(--accent);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.info-card p {
  font-size: clamp(.78rem, .9vw, .88rem);
  line-height: 1.8;
  color: var(--text-dim);
}
.info-card .bold {
  font-family: var(--ff-bold);
  color: var(--text);
}
.info-card .light {
  font-family: var(--ff-book);
}

/* Reference */
.ref-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--glass-border);
}
.ref-row__text {
  font-size: clamp(.72rem, .85vw, .82rem);
  color: #0e3950;
  line-height: 1.5;
}
.ref-row__text strong {
  display: block;
  font-family: var(--ff-bold);
  color: #0e3950;
  margin-bottom: 2px;
}
.ref-row__qr {
  width: auto;
  height: 56px;
 
  flex-shrink: 0;
}

/* ===========================
   FOOTER
   =========================== */
.footer {
  width: 100%;
  max-width: 520px;
  margin-top: auto;
  padding: 40px 0 20px;
  animation: fadeUp 600ms ease 200ms both;
}
.footer__address-img {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 16px;
}
.footer__address-img img {
  width: 100%;
  display: block;
}
.footer__meta {
  display: flex;
  justify-content: space-between;
  font-size: clamp(.65rem, .8vw, .75rem);
  color: #0e3950;
  opacity: .7;
  padding-top: 12px;
  border-top: 1px solid var(--glass-border);
}

/* ===========================
   ANIMATIONS
   =========================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(.92) translateY(10px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%  { transform: translateX(-8px); }
  40%  { transform: translateX(8px); }
  60%  { transform: translateX(-5px); }
  80%  { transform: translateX(5px); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: .3; }
}

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 600px) {
  .app { padding: 24px 16px 0; }
  .card { padding: 28px 24px; border-radius: var(--radius-lg); }
  .results__card { padding: 28px 20px; border-radius: var(--radius-lg); }
  .results__grid { gap: 24px; }
  .info-grid { grid-template-columns: 1fr; }
  .footer__meta { flex-direction: column; align-items: center; gap: 2px; }
  .ref-row { flex-direction: column; text-align: center; }
  .bg__orb--1 { width: 350px; height: 350px; }
  .bg__orb--2 { width: 300px; height: 300px; }
  .bg__orb--3 { width: 200px; height: 200px; }
}

@media (max-width: 390px) {
  .card { padding: 24px 18px; }
  .results__card { padding: 24px 16px; }
  .results__grid { gap: 16px; }
  .header { margin-bottom: 28px; }
}