/* =========================
   THEME + RESET (1 sola vez)
   ========================= */
:root{
  --bg: #0b1220;
  --surface: #111a2e;
  --surface-2: rgba(255,255,255,.06);

  --text: #e8eefc;
  --muted: #a9b7d0;
  --border: rgba(255,255,255,.14);

  --primary: #4f7cff;
  --primary-hover: #3f69ea;

  --danger: #ff5a5f;
  --success: #23c483;
  --warn: #ffb020;

  --radius: 12px;
  --shadow: 0 10px 30px rgba(0,0,0,.25);

  /* Responsive spacing + typography */
  --space-1: clamp(8px, 1.5vw, 12px);
  --space-2: clamp(12px, 2vw, 18px);
  --space-3: clamp(16px, 3vw, 28px);

  --text-base: clamp(14px, 1.2vw, 16px);
  --text-lg: clamp(18px, 2vw, 22px);
  --text-xl: clamp(22px, 3vw, 30px);

  --container: 960px;
}

*,
*::before,
*::after{ box-sizing: border-box; }

html{ -webkit-text-size-adjust: 100%; }

body{
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--text);
  background: radial-gradient(1200px 800px at 20% 0%, #16254a 0%, var(--bg) 55%);
}

img, video{
  max-width: 100%;
  height: auto;
  display: block;
}

/* =========================
   LAYOUT
   ========================= */
.container{
  width: min(100% - 2 * var(--space-3), var(--container));
  margin-inline: auto;
  padding-block: var(--space-3);
}

.card{
  background: color-mix(in srgb, var(--surface) 92%, black);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: var(--space-3);
}

/* Para headers opcionales (si los usas) */
header{
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,.03);
}
.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-block: var(--space-2);
}

/* =========================
   TYPOGRAPHY
   ========================= */
h1{ font-size: var(--text-xl); margin: 0 0 var(--space-2); }
h2{ font-size: var(--text-lg); margin: 0 0 var(--space-2); }
h3{ margin: 0 0 var(--space-2); }
p{ margin: 0 0 var(--space-2); color: var(--muted); }

/* =========================
   FORMS
   ========================= */
label{
  display: block;
  margin: var(--space-2) 0 6px;
  font-weight: 600;
}

input,
select,
textarea{
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  outline: none;
  transition: border-color .15s, box-shadow .15s, transform .05s;
}

textarea{ min-height: 110px; resize: vertical; }

input::placeholder,
textarea::placeholder{ color: rgba(232,238,252,.55); }

input:focus,
select:focus,
textarea:focus{
  border-color: color-mix(in srgb, var(--primary) 65%, white);
  box-shadow: 0 0 0 4px rgba(79,124,255,.25);
}

/* HTML5 invalid */
input:invalid{ border-color: rgba(255,90,95,.65); }

/* =========================
   BUTTONS (sirve para <a> y <button> y submit)
   ========================= */
.btn,
button,
input[type="submit"]{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;

  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid transparent;

  background: var(--primary);
  color: #fff;
  font-weight: 700;

  cursor: pointer;
  text-decoration: none;

  transition: transform .05s, background .15s, box-shadow .15s, opacity .15s;
  box-shadow: 0 10px 18px rgba(79,124,255,.22);
}

.btn:hover,
button:hover,
input[type="submit"]:hover{
  background: var(--primary-hover);
}

.btn:active,
button:active,
input[type="submit"]:active{
  transform: translateY(1px);
}

.btn:disabled,
button:disabled,
input[type="submit"]:disabled{
  opacity: .55;
  cursor: not-allowed;
  box-shadow: none;
}

/* Variantes */
.btn.secondary{
  background: transparent;
  border-color: var(--border);
  color: var(--text);
  box-shadow: none;
}
.btn.secondary:hover{
  background: rgba(255,255,255,.08);
}

.btn.danger{
  background: var(--danger);
  box-shadow: 0 10px 18px rgba(255,90,95,.18);
}
.btn.danger:hover{ filter: brightness(.95); }

/* =========================
   FLASH MESSAGES
   ========================= */
.flash{
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-2);
  display: grid;
  gap: 10px;
}

.flash li{
  border: 1px solid var(--border);
  background: rgba(255,255,255,.06);
  border-radius: 12px;
  padding: 10px 12px;
}

.flash li strong{ text-transform: capitalize; }
.flash li.success{ border-color: rgba(35,196,131,.45); }
.flash li.error{ border-color: rgba(255,90,95,.55); }
.flash li.warning{ border-color: rgba(255,176,32,.55); }
.flash li.info{ border-color: rgba(79,124,255,.45); }

/* =========================
   HELPERS / GRID
   ========================= */
.row{
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.row > *{
  flex: 1 1 220px;
}

/* Grid responsive (cards, dashboards, etc.) */
.grid{
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

/* =========================
   RESPONSIVE BREAKPOINTS
   ========================= */
@media (max-width: 480px){
  .card{ padding: var(--space-2); }
  .row > *{ flex-basis: 100%; }
}

@media (min-width: 768px){
  .container{ padding-block: calc(var(--space-3) * 1.2); }
}

@media (min-width: 1024px){
  .container{ padding-block: calc(var(--space-3) * 1.4); }
}

/* =========================
   LOGO
   ========================= */
.logo-container{
  display: flex;
  justify-content: center; /* horizontal */
  align-items: center;     /* vertical, si hay altura */
  padding-top: 20px;
}
a img { display: block; }