:root {
  --bg: #f6efe4;
  --bg-accent: #e6d5bd;
  --panel: rgba(255, 250, 243, 0.92);
  --ink: #191512;
  --muted: #5c4d41;
  --line: rgba(25, 21, 18, 0.12);
  --brand: #c53a10;
  --brand-dark: #7f2208;
  --warn: #a15a00;
  --error: #9a1e1e;
  --shadow: 0 20px 50px rgba(56, 31, 14, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(197, 58, 16, 0.16), transparent 32%),
    radial-gradient(circle at top right, rgba(0, 89, 255, 0.1), transparent 26%),
    linear-gradient(160deg, var(--bg) 0%, #f8f3ee 46%, var(--bg-accent) 100%);
  min-height: 100vh;
}

.shell {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 60px;
}

.hero {
  padding: 28px 0 18px;
}

.eyebrow {
  margin: 0 0 10px;
  letter-spacing: 0.24em;
  font-size: 0.78rem;
  color: var(--brand-dark);
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 5rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.lead {
  max-width: 720px;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--muted);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  border-radius: 28px;
  padding: 26px;
  backdrop-filter: blur(16px);
}

.panel + .panel {
  margin-top: 24px;
}

.is-hidden {
  display: none;
}

.formulario {
  display: grid;
  gap: 22px;
}

.upload-box {
  display: grid;
  gap: 8px;
  padding: 18px;
  border: 1px dashed rgba(25, 21, 18, 0.28);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.55);
}

.controles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

label span,
h2 {
  display: block;
  font-weight: 700;
  margin-bottom: 8px;
}

input[type="file"],
input[type="range"],
select,
.cta,
.download {
  width: 100%;
}

input[type="range"] {
  accent-color: var(--brand);
}

select,
input[type="file"] {
  border-radius: 14px;
  border: 1px solid var(--line);
  padding: 12px;
  background: #fff;
}

small {
  color: var(--muted);
}

.cta,
.download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 18px;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--brand) 0%, #ea6d14 100%);
  color: white;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  box-shadow: 0 10px 24px rgba(197, 58, 16, 0.28);
  cursor: pointer;
}

.cta:hover,
.download:hover {
  filter: brightness(1.02);
}

.cta:disabled {
  opacity: 0.72;
  cursor: progress;
}

.alert {
  border-radius: 18px;
  padding: 16px 18px;
  margin-bottom: 20px;
}

.alert p {
  margin-bottom: 0;
}

.alert-warning {
  background: rgba(161, 90, 0, 0.12);
  border: 1px solid rgba(161, 90, 0, 0.18);
  color: var(--warn);
}

.alert-error {
  background: rgba(154, 30, 30, 0.12);
  border: 1px solid rgba(154, 30, 30, 0.2);
  color: var(--error);
}

.estimate-box {
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid rgba(25, 21, 18, 0.12);
  background: rgba(255, 255, 255, 0.62);
}

.estimate-box p {
  margin: 8px 0 0;
  color: var(--muted);
}

.progress-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.progress-track {
  width: 100%;
  height: 16px;
  border-radius: 999px;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(0, 162, 255, 0.14), rgba(255, 70, 70, 0.12)),
    rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(25, 21, 18, 0.1);
  margin-top: 8px;
}

.progress-fill {
  width: 0;
  height: 100%;
  border-radius: 999px;
  background:
    linear-gradient(90deg, #00b7ff 0%, #ff4b4b 48%, #9a00ff 100%);
  box-shadow: 0 0 18px rgba(255, 75, 75, 0.28);
  transition: width 0.35s ease;
}

.progress-message {
  margin: 14px 0 0;
  color: var(--muted);
}

.resultado video {
  width: 100%;
  border-radius: 18px;
  background: #0b0b0b;
  margin: 10px 0 16px;
}

@media (max-width: 720px) {
  .shell {
    width: min(100%, calc(100% - 18px));
    padding-top: 18px;
  }

  .panel {
    padding: 18px;
    border-radius: 22px;
  }

  .controles {
    grid-template-columns: 1fr;
  }
}