/* =========================================================
   LEXNUM - OFS TLAXCALA
   Estilo institucional profesional, limpio y responsivo
   ========================================================= */

:root {
  --color-primary: #1e3a8a;
  --color-primary-light: #2563eb;
  --color-accent: #3b82f6;
  --color-success: #16a34a;
  --color-danger: #dc2626;
  --color-bg: #f3f4f6;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-muted: #64748b;
  --color-border: #e5e7eb;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  --transition: all 0.25s ease;
  --header-height: 80px;
  --font-sans: "Inter", "Segoe UI", Roboto, sans-serif;
}

/* ===== RESET ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: linear-gradient(180deg, #f9fafb 0%, #eef2ff 100%);
  color: var(--color-text);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-top: var(--header-height);
}

/* =========================================================
   HEADER
   ========================================================= */
.header-fixed {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.header-content {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  max-width: 1200px;
  width: 100%;
  justify-content: center;
  padding: 0 1rem;
}

.ofs-logo {
  height: 54px;
  width: auto;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.ofs-logo:hover {
  transform: scale(1.06);
}

.header-text h1 {
  font-size: 1.8rem;
  color: var(--color-primary);
  font-weight: 800;
  letter-spacing: -0.5px;
}

.header-text p {
  font-size: 0.95rem;
  color: var(--color-muted);
}

/* =========================================================
   MAIN CONTENT
   ========================================================= */
.main-content {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: 3.5rem 1rem;
}

.tool-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 3rem 2.5rem;
  text-align: center;
  max-width: 560px;
  width: 100%;
  transition: var(--transition);
  animation: fadeInUp 0.4s ease;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.1);
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.tool-card h2 {
  color: var(--color-primary);
  margin-bottom: 1rem;
  font-size: 1.5rem;
  font-weight: 700;
}

.tool-card p {
  color: var(--color-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

/* Divider */
.divider {
  margin: 2rem 0;
  border: none;
  border-top: 1px solid var(--color-border);
}

/* =========================================================
   INPUTS
   ========================================================= */
.input-group {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

input[type="number"] {
  width: 100%;
  max-width: 340px;
  padding: 0.9rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  text-align: center;
  outline: none;
  transition: var(--transition);
  background: var(--color-bg);
}

input[type="number"]:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
  background: #fff;
}

input[type="file"] {
  width: 100%;
  max-width: 340px;
  padding: 1rem;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-muted);
  font-size: 0.95rem;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}

input[type="file"]:hover {
  border-color: var(--color-accent);
  background: rgba(37, 99, 235, 0.05);
  color: var(--color-text);
}

input[type="file"]::file-selector-button {
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.7rem 1.2rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  margin-right: 1rem;
}

input[type="file"]::file-selector-button:hover {
  background: var(--color-primary);
}

/* =========================================================
   BUTTONS
   ========================================================= */
button, .btn-download, .btn-secondary {
  display: inline-block;
  background: var(--color-primary-light);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 1rem 2rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow);
  font-size: 1rem;
  text-decoration: none;
}

button:hover, .btn-download:hover, .btn-secondary:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
}

.btn-download {
  background: var(--color-success);
}

.btn-download:hover {
  background: #15803d;
}

.btn-secondary {
  background: var(--color-accent);
}

.btn-secondary:hover {
  background: var(--color-primary-light);
}

/* =========================================================
   LOADER
   ========================================================= */
.loader {
  border: 4px solid #e5e7eb;
  border-top: 4px solid var(--color-accent);
  border-radius: 50%;
  width: 26px;
  height: 26px;
  animation: spin 1s linear infinite;
  margin-left: 0.8rem;
}

@keyframes spin {
  100% { transform: rotate(360deg); }
}

/* =========================================================
   RESULT TEXT
   ========================================================= */
.resultado {
  font-size: 1.05rem;
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.08);
  padding: 1rem;
  border-radius: var(--radius);
  margin-top: 1rem;
  max-width: 420px;
  margin-inline: auto;
  transition: var(--transition);
  word-wrap: break-word;
  min-height: 1.5em;
}

/* =========================================================
   STATUS MESSAGE
   ========================================================= */
.status {
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.95rem;
  margin-top: 1rem;
}

/* =========================================================
   FOOTER
   ========================================================= */
.dashboard-footer {
  text-align: center;
  padding: 1rem;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.85rem;
  box-shadow: var(--shadow);
}

/* =========================================================
   RESPONSIVE DESIGN
   ========================================================= */
@media (max-width: 768px) {
  .header-text h1 {
    font-size: 1.4rem;
  }

  .tool-card {
    padding: 2rem 1.2rem;
  }

  input[type="file"],
  input[type="number"],
  button {
    width: 100%;
  }

  #resultadoTexto {
    font-size: 1rem;
  }

  .btn-download, .btn-secondary {
    width: 100%;
    padding: 0.9rem 1rem;
  }
}

/* =========================================================
   ACCESSIBILITY FOCUS STATES
   ========================================================= */
button:focus,
input:focus,
a:focus {
  outline: 3px solid rgba(37, 99, 235, 0.4);
  outline-offset: 3px;
}