@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:wght@300;400;500&display=swap');

/* ─── Dark Theme (default) ───────────────────── */
:root {
  --bg:         #080810;
  --surface:    #10101A;
  --card:       #16161F;
  --border:     rgba(255,255,255,0.07);
  --accent:     #6C63FF;
  --accent-2:   #9B8FFF;
  --glow:       rgba(108,99,255,0.30);
  --text:       #EEEDF8;
  --muted:      #72718A;
  --success:    #2DD4BF;
  --success-bg: rgba(45,212,191,0.08);
  --success-br: rgba(45,212,191,0.18);
  --nav-bg:     rgba(8,8,16,0.85);
  --nav-h:      64px;
  --toggle-bg:  rgba(255,255,255,0.07);
  --toggle-br:  rgba(255,255,255,0.12);
}

/* ─── Light Theme ────────────────────────────── */
body.light {
  --bg:         #F4F3FF;
  --surface:    #FFFFFF;
  --card:       #FFFFFF;
  --border:     rgba(0,0,0,0.08);
  --accent:     #5A52E8;
  --accent-2:   #7B72F5;
  --glow:       rgba(90,82,232,0.18);
  --text:       #1A1830;
  --muted:      #8885A8;
  --success:    #0D9488;
  --success-bg: rgba(13,148,136,0.07);
  --success-br: rgba(13,148,136,0.20);
  --nav-bg:     rgba(244,243,255,0.85);
  --toggle-bg:  rgba(0,0,0,0.05);
  --toggle-br:  rgba(0,0,0,0.10);
}

/* ─── Reset ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ─── Body ───────────────────────────────────── */
body {
  min-height: 100vh;
  background: var(--bg);
  background-image: radial-gradient(ellipse 55% 45% at 50% 60%, rgba(108,99,255,0.07) 0%, transparent 70%);
  font-family: 'DM Sans', sans-serif;
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: background 0.3s, color 0.3s;
}

body.light {
  background-image: radial-gradient(ellipse 55% 45% at 50% 60%, rgba(90,82,232,0.05) 0%, transparent 70%);
}

/* ─── Navbar ─────────────────────────────────── */
.navbar {
  width: 100%;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--nav-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 10;
  transition: background 0.3s, border-color 0.3s;
}

.navbar h2 {
  font-family: 'Syne', sans-serif;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}

.navbar h2 span {
  color: var(--accent);
}

/* ─── Theme Toggle Button ────────────────────── */
.theme-toggle {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--toggle-br);
  background: var(--toggle-bg);
  color: var(--text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
  position: relative;
  overflow: hidden;
}

.theme-toggle:hover {
  background: var(--accent);
  border-color: var(--accent);
  transform: rotate(20deg) scale(1.08);
}

/* show/hide sun & moon icons */
.icon-sun  { display: none; }
.icon-moon { display: block; }

body.light .icon-sun  { display: block; }
body.light .icon-moon { display: none; }

/* ─── Card (form) ────────────────────────────── */
.card {
  width: 100%;
  max-width: 460px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2.5rem 2rem;
  margin: clamp(2rem, 8vh, 5rem) 1rem 2rem;
  position: relative;
  overflow: hidden;
  animation: slideUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
  transition: background 0.3s, border-color 0.3s;

  /* light mode card shadow */
  box-shadow: 0 4px 32px rgba(0,0,0,0.06);
}

/* top accent line */
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 15%; right: 15%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

/* ─── Label ──────────────────────────────────── */
label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.5rem;
  transition: color 0.3s;
}

/* ─── Input ──────────────────────────────────── */
input[type="text"] {
  width: 100%;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.3s;
}

input[type="text"]::placeholder { color: var(--muted); }

input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--glow);
}

/* ─── Submit Button ──────────────────────────── */
.btn {
  width: 100%;
  margin-top: 1rem;
  padding: 0.9rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-family: 'Syne', sans-serif;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.12) 0%, transparent 55%);
  pointer-events: none;
}

.btn:hover {
  background: var(--accent-2);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--glow);
}

.btn:active { transform: translateY(0); box-shadow: none; }

/* ─── Result Box ─────────────────────────────── */
.result-box {
  margin-top: 1.25rem;
}

.result-box h3 {
  font-family: 'Syne', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--success);
  margin-bottom: 0.6rem;
  transition: color 0.3s;
}

.result-box a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 0.85rem 1rem;
  background: var(--success-bg);
  border: 1px solid var(--success-br);
  border-radius: 10px;
  color: var(--success);
  font-size: 13.5px;
  font-weight: 500;
  text-decoration: none;
  word-break: break-all;
  transition: background 0.2s, border-color 0.2s;
  animation: fadeIn 0.4s ease both;
}

.result-box a:hover {
  filter: brightness(1.1);
}

/* ─── Copy Button (added via JS) ─────────────── */
.copy-btn {
  flex-shrink: 0;
  background: transparent;
  border: 1px solid var(--success-br);
  color: var(--success);
  border-radius: 6px;
  padding: 5px 12px;
  font-size: 12px;
  font-family: 'DM Sans', sans-serif;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
  white-space: nowrap;
}

.copy-btn:hover {
  background: var(--success-bg);
  border-color: var(--success);
}

.copy-btn.copied {
  opacity: 0.7;
}

/* ─── Animations ─────────────────────────────── */
@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0);    }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0);   }
}

/* ─── Responsive ─────────────────────────────── */
@media (max-width: 500px) {
  .card    { padding: 2rem 1.25rem; border-radius: 16px; }
  .navbar  { padding: 0 1.25rem; }
}


.nav-signup-btn {
    text-decoration: none;
    padding: 0.45rem 1.1rem;
    border: 1px solid var(--accent);
    border-radius: 8px;
    color: var(--accent);
    font-size: 14px;
    font-weight: 500;
    transition: background 0.2s, color 0.2s;
}

.nav-signup-btn:hover {
    background: var(--accent);
    color: #fff;
}