styles.css

/* =====================================================================
   DANIEL CARMASSI — Medidor de Aliança
   Stylesheet
   ---------------------------------------------------------------------
   Palette: deep black + gold, editorial serif display type paired with
   a quiet, precise sans for UI. No frameworks, no build step.
   ===================================================================== */

/* ---------------------------------------------------------------------
   0. Design tokens
   --------------------------------------------------------------------- */
:root{
  /* Base surfaces */
  --black:        #0a0a09;
  --black-soft:   #141210;
  --black-elev:   #1b1815;
  --hairline:     rgba(212, 175, 55, 0.22);
  --hairline-strong: rgba(212, 175, 55, 0.45);

  /* Gold family */
  --gold-1: #f3dfa4;
  --gold-2: #d4af37;
  --gold-3: #c9a24b;
  --gold-4: #b8860b;
  --gold-gradient: linear-gradient(135deg, var(--gold-1) 0%, var(--gold-2) 38%, var(--gold-3) 65%, var(--gold-4) 100%);
  --gold-gradient-soft: linear-gradient(135deg, rgba(243,223,164,.16), rgba(212,175,55,.10) 60%, rgba(184,134,11,.14));

  /* Text */
  --ink-1: #f3efe6;      /* headline text on black */
  --ink-2: #d8d2c4;      /* body text on black */
  --ink-3: #9c9587;      /* muted text on black */

  /* Type */
  --font-display: 'Cormorant Garamond', 'Times New Roman', serif;
  --font-ui: 'Inter', -apple-system, sans-serif;

  /* Rhythm */
  --radius-s: 6px;
  --radius-m: 14px;
  --radius-l: 26px;
  --ease-out: cubic-bezier(.16,.8,.28,1);
  --ease-soft: cubic-bezier(.4,0,.2,1);
}

@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------------------------------------------------------------------
   1. Reset
   --------------------------------------------------------------------- */
*, *::before, *::after{ box-sizing: border-box; }
html, body{ height: 100%; }
body{
  margin: 0;
  background: var(--black);
  color: var(--ink-2);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img{ max-width: 100%; display: block; }
button{ font: inherit; color: inherit; }
a{ color: inherit; }
ol{ margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p{ margin: 0; }
::selection{ background: rgba(212,175,55,.35); color: #fff; }

/* ---------------------------------------------------------------------
   2. Atmosphere — vignette + grain, sits behind all content
   --------------------------------------------------------------------- */
.atmosphere{
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 90% 60% at 50% -10%, rgba(212,175,55,.10), transparent 60%),
    radial-gradient(ellipse 70% 50% at 100% 110%, rgba(184,134,11,.08), transparent 60%),
    var(--black);
}
.atmosphere::after{
  content: "";
  position: absolute;
  inset: 0;
  opacity: .5;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px 160px;
}

/* ---------------------------------------------------------------------
   3. Shell / layout
   --------------------------------------------------------------------- */
.site-shell{
  position: relative;
  z-index: 1;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: clamp(18px, 3.2vh, 40px) 20px clamp(16px, 2.6vh, 32px);
}

.site-header{
  width: 100%;
  max-width: 560px;
  display: flex;
  justify-content: center;
  margin-bottom: clamp(16px, 3vh, 48px);
}
.site-header__logo{
  width: clamp(150px, 16vh, 196px);
  height: auto;
  opacity: .96;
  filter: drop-shadow(0 6px 26px rgba(212,175,55,.14));
}

/* stage-wrap absorve o espaço livre e centraliza o painel ativo na
   vertical — assim, em telas altas o conteúdo fica no meio, e em telas
   baixas (notebooks 768p) tudo cabe sem rolagem. */
.stage-wrap{
  width: 100%;
  max-width: 560px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.site-footer{
  margin-top: 56px;
  text-align: center;
  color: var(--ink-3);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

/* ---------------------------------------------------------------------
   4. Panels
   --------------------------------------------------------------------- */
.panel{
  display: none;
  flex-direction: column;
}
.panel.is-active{
  display: flex;
  animation: panel-in .6s var(--ease-out) both;
}
@keyframes panel-in{
  from{ opacity: 0; transform: translateY(14px); }
  to{ opacity: 1; transform: translateY(0); }
}

.panel--hero{
  align-items: center;
  text-align: center;
  padding-top: clamp(8px, 4vw, 24px);
}

/* ---------------------------------------------------------------------
   5. Typography components
   --------------------------------------------------------------------- */
.eyebrow{
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .32em;
  text-transform: uppercase;
  color: var(--gold-2);
  margin-bottom: 14px;
}

.display-title{
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(42px, 9vw, 68px);
  line-height: 1.06;
  color: var(--ink-1);
  margin-bottom: 20px;
  letter-spacing: .002em;
}
.display-title__accent{
  font-style: italic;
  font-weight: 500;
  background: var(--gold-gradient);
  background-size: 220% 220%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: shimmer 7s ease-in-out infinite;
}
@keyframes shimmer{
  0%, 100%{ background-position: 0% 50%; }
  50%{ background-position: 100% 50%; }
}

.lede{
  max-width: 42ch;
  font-size: 17px;
  color: var(--ink-2);
  margin-bottom: 30px;
}

.section-title{
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(30px, 6vw, 40px);
  color: var(--ink-1);
  margin-bottom: 12px;
}

.instruction{
  font-size: 15px;
  color: var(--ink-2);
  max-width: 54ch;
  margin-bottom: 26px;
}

/* ---------------------------------------------------------------------
   6. Requirements list (hero)
   --------------------------------------------------------------------- */
.requirements{
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
  margin: 4px auto 34px;
  padding: 18px 22px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, rgba(255,255,255,.02), transparent);
}
.requirements__item{
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14.5px;
  color: var(--ink-2);
  text-align: left;
}
.requirements__icon{
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 1px solid var(--hairline-strong);
  color: var(--gold-2);
}

/* ---------------------------------------------------------------------
   7. Buttons
   --------------------------------------------------------------------- */
.hero-actions{ display: flex; flex-direction: column; align-items: center; gap: 14px; }
.hero-actions__row{ display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }
.hero-actions__note{ font-size: 13px; color: var(--ink-3); }

.btn{
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px 34px;
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .25s var(--ease-out), box-shadow .25s var(--ease-out), border-color .25s;
  -webkit-tap-highlight-color: transparent;
}
.btn:active{ transform: translateY(1px) scale(.99); }

.btn--primary{
  color: #17130a;
  background: var(--gold-gradient);
  background-size: 200% 100%;
  background-position: 0% 0%;
  box-shadow: 0 10px 28px -10px rgba(212,175,55,.55);
}
.btn--primary::after{
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(115deg, transparent 20%, rgba(255,255,255,.55) 50%, transparent 80%);
  background-size: 220% 100%;
  background-position: 120% 0;
  opacity: 0;
  transition: opacity .2s;
}
.btn--primary:hover{ box-shadow: 0 14px 34px -10px rgba(212,175,55,.7); background-position: 100% 0%; }
.btn--primary:hover::after{ opacity: .5; animation: sheen 1s var(--ease-soft); }
@keyframes sheen{
  from{ background-position: 120% 0; }
  to{ background-position: -20% 0; }
}

.btn--ghost{
  color: var(--gold-1);
  background: transparent;
  border-color: var(--hairline-strong);
}
.btn--ghost:hover{ border-color: var(--gold-2); background: rgba(212,175,55,.06); }

.btn--link{
  padding: 10px 4px;
  color: var(--ink-3);
  background: none;
  text-transform: none;
  letter-spacing: 0;
  font-weight: 500;
  font-size: 13.5px;
  border-radius: 0;
}
.btn--link:hover{ color: var(--gold-2); }

/* ---------------------------------------------------------------------
   8. Stepper (progress indicator)
   --------------------------------------------------------------------- */
.stepper{ margin-bottom: 30px; }
.stepper ol{ display: flex; align-items: center; gap: 10px; }
.stepper__item{
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-3);
}
.stepper__num{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--hairline);
  font-family: var(--font-display);
  font-size: 14px;
  color: var(--ink-3);
  transition: all .3s;
}
.stepper__label{
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  display: none;
}
.stepper__sep{
  width: 26px;
  height: 1px;
  background: var(--hairline);
}
.stepper__item.is-current .stepper__num{
  border-color: var(--gold-2);
  color: var(--black);
  background: var(--gold-gradient);
  box-shadow: 0 0 0 4px rgba(212,175,55,.14);
}
.stepper__item.is-current .stepper__label{ color: var(--gold-2); }
.stepper__item.is-done .stepper__num{ border-color: var(--gold-3); color: var(--gold-3); }

@media (min-width: 480px){
  .stepper__label{ display: inline-block; }
}

/* ---------------------------------------------------------------------
   9. Measurement stage (shared frame for card + ring)
   --------------------------------------------------------------------- */
.stage{
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: clamp(170px, 26vh, 220px);
  margin-bottom: clamp(14px, 2.2vh, 22px);
  padding: clamp(20px, 3vh, 36px) 20px;
  border-radius: var(--radius-l);
  background:
    radial-gradient(ellipse at 50% 30%, rgba(212,175,55,.07), transparent 65%),
    var(--black-soft);
  border: 1px solid var(--hairline);
  overflow: hidden;
}
/* No passo de medição não desenhamos moldura: o cliente apoia a aliança
   sobre a tela e só precisa enxergar UM círculo. Sem caixa, sem guias. */
.stage--ring{
  min-height: clamp(190px, 30vh, 260px);
  background: none;
  border: none;
  overflow: visible;
}
.stage--ring .stage__guides{ display: none; }

.stage__guides{ position: absolute; inset: 18px; pointer-events: none; }
.stage__guide{ position: absolute; background: repeating-linear-gradient(to bottom, var(--hairline-strong) 0 4px, transparent 4px 9px); }
.stage__guide--v{ top: 0; bottom: 0; left: 0; width: 1px; }
.stage__guide--h{ left: 0; right: 0; top: 0; height: 1px; background: repeating-linear-gradient(to right, var(--hairline-strong) 0 4px, transparent 4px 9px); }

/* Card object -------------------------------------------------------- */
.card-object{
  position: relative;
  border-radius: 12px;
  background: linear-gradient(155deg, #1d1a15, #100e0b 60%, #1b1712);
  border: 1.5px solid var(--gold-2);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,.06),
    0 18px 40px -20px rgba(0,0,0,.8),
    0 0 0 1px rgba(212,175,55,.08);
  transition: width .05s linear, height .05s linear;
  overflow: hidden;
}
.card-object__shine{
  position: absolute;
  inset: -40% -10%;
  background: linear-gradient(115deg, transparent 40%, rgba(212,175,55,.16) 50%, transparent 60%);
  transform: rotate(-6deg);
}
.card-object__chip{
  position: absolute;
  left: 9%;
  top: 20%;
  width: 17%;
  aspect-ratio: 4/3;
  border-radius: 3px;
  background: linear-gradient(155deg, var(--gold-1), var(--gold-4));
  opacity: .85;
}
.card-object__ghost{
  position: absolute;
  right: 8%;
  bottom: 10%;
  font-family: var(--font-ui);
  font-size: 11px;
  letter-spacing: .18em;
  color: rgba(212,175,55,.35);
}

/* Ring object ---------------------------------------------------------*/
/* Disco dourado CHEIO com uma única borda: existe apenas UMA aresta
   (a externa = o diâmetro medido). Como box-sizing é border-box, a borda
   fica dentro da largura, então a aresta externa continua valendo o
   diâmetro exato. O cliente encaixa esse disco por dentro do furo da
   aliança — sem risco de confundir aro interno com externo. */
.ring-object{
  position: relative;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 32%, var(--gold-1), var(--gold-2) 45%, var(--gold-4) 100%);
  border: 2px solid var(--gold-1);
  box-shadow:
    0 20px 46px -18px rgba(212,175,55,.45),
    inset 0 0 22px rgba(120,80,0,.35);
  transition: width .05s linear, height .05s linear;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ring-object__readout{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(20px, 6vw, 30px);
  color: #1a1305;                 /* escuro para contrastar com o dourado */
  text-shadow: 0 1px 0 rgba(255,255,255,.25);
}

/* ---------------------------------------------------------------------
   10. Controls (sliders + fine-adjust buttons)
   --------------------------------------------------------------------- */
.control{ margin-bottom: 8px; }
.control__label-row{
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 10px;
}
.control__label{
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.control__value{
  font-family: var(--font-ui);
  font-size: 12.5px;
  color: var(--gold-2);
  font-variant-numeric: tabular-nums;
}
.control__row{
  display: flex;
  align-items: center;
  gap: 14px;
}

.stepper-btn{
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--hairline-strong);
  background: var(--black-elev);
  color: var(--gold-1);
  font-size: 19px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color .2s, transform .15s, background .2s;
}
.stepper-btn:hover{ border-color: var(--gold-2); background: #221d15; }
.stepper-btn:active{ transform: scale(.92); }

/* Custom range slider — jewelry-inspired: thin gold rail, diamond thumb */
.slider{
  flex: 1;
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 24px;
  background: transparent;
  cursor: pointer;
}
.slider::-webkit-slider-runnable-track{
  height: 2px;
  background: linear-gradient(90deg, var(--hairline-strong), var(--hairline));
  border-radius: 2px;
}
.slider::-moz-range-track{
  height: 2px;
  background: linear-gradient(90deg, var(--hairline-strong), var(--hairline));
  border-radius: 2px;
}
.slider::-webkit-slider-thumb{
  -webkit-appearance: none;
  margin-top: -8px;
  width: 18px;
  height: 18px;
  border-radius: 3px;
  background: var(--gold-gradient);
  border: 1px solid #fff3;
  transform: rotate(45deg);
  box-shadow: 0 4px 12px -2px rgba(212,175,55,.7);
  transition: transform .15s var(--ease-out), box-shadow .15s;
}
.slider::-moz-range-thumb{
  width: 18px;
  height: 18px;
  border-radius: 3px;
  background: var(--gold-gradient);
  border: 1px solid #fff3;
  transform: rotate(45deg);
  box-shadow: 0 4px 12px -2px rgba(212,175,55,.7);
}
.slider:active::-webkit-slider-thumb{ transform: rotate(45deg) scale(1.18); }
.slider:focus-visible::-webkit-slider-thumb{ box-shadow: 0 0 0 5px rgba(212,175,55,.25); }

/* ---------------------------------------------------------------------
   11. Readouts (step 2)
   --------------------------------------------------------------------- */
.readout-row{
  display: flex;
  gap: 12px;
  margin-bottom: 26px;
}
.readout{
  flex: 1;
  padding: 14px 16px;
  border-radius: var(--radius-m);
  border: 1px solid var(--hairline);
  background: var(--black-soft);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.readout--accent{ border-color: var(--hairline-strong); background: linear-gradient(180deg, rgba(212,175,55,.08), transparent); }
.readout__label{
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.readout__value{
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--ink-1);
  font-variant-numeric: tabular-nums;
}
.readout--accent .readout__value{ color: var(--gold-1); }

/* ---------------------------------------------------------------------
   12. Panel actions (footer buttons of each step)
   --------------------------------------------------------------------- */
.panel-actions{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 8px;
}
.panel-actions--result{
  flex-direction: column;
  align-items: stretch;
}
.panel-actions--result .btn{ width: 100%; }

/* ---------------------------------------------------------------------
   13. Result panel
   --------------------------------------------------------------------- */
.result-hero{
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 40px 20px 34px;
  margin-bottom: 22px;
  border-radius: var(--radius-l);
  border: 1px solid var(--hairline-strong);
  background: radial-gradient(ellipse at 50% 0%, rgba(212,175,55,.10), transparent 70%), var(--black-soft);
}
.result-hero__number{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(88px, 26vw, 140px);
  line-height: .9;
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 10px 30px rgba(212,175,55,.25));
}
.result-hero__caption{
  margin-top: 10px;
  font-size: 14px;
  color: var(--ink-2);
}
.result-hero__caption strong{ color: var(--gold-1); font-weight: 600; }

.warning-note{
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-3);
  padding: 14px 18px;
  border-left: 2px solid var(--gold-3);
  background: rgba(212,175,55,.05);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  margin-bottom: 28px;
}
.warning-note strong{ color: var(--gold-2); }

/* ---------------------------------------------------------------------
   14. Responsive tweaks
   --------------------------------------------------------------------- */
@media (min-width: 620px){
  .panel-actions--result{ flex-direction: row; }
  .panel-actions--result .btn{ width: auto; flex: 1; }
}

@media (max-width: 380px){
  .btn{ padding: 14px 22px; font-size: 13px; }
  .stage{ padding: 26px 12px; }
}

/* Telas baixas em desktop/notebook (ex.: 1366x768): compacta o ritmo
   vertical para o painel inteiro caber na viewport, sem rolagem. */
@media (min-width: 600px) and (max-height: 860px){
  .site-header{ margin-bottom: 14px; }
  .site-header__logo{ width: clamp(120px, 12vh, 160px); }

  .stepper{ margin-bottom: 16px; }

  .display-title{ font-size: clamp(38px, 6.2vh, 58px); margin-bottom: 14px; }
  .lede{ font-size: 15.5px; margin-bottom: 18px; }
  .requirements{ margin: 2px auto 20px; padding: 14px 20px; gap: 9px; }

  .section-title{ font-size: clamp(26px, 4.4vh, 36px); margin-bottom: 8px; }
  .instruction{ font-size: 14px; margin-bottom: 16px; }

  .readout-row{ margin: 12px 0; }
  .readout{ padding: 11px 14px; }

  .result-hero{ padding: 26px 20px 22px; margin-bottom: 16px; }
  .warning-note{ margin-bottom: 18px; padding: 12px 16px; }
}