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

:root {
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --panel-width: 380px;
  --glass-bg: rgba(255, 255, 255, 0.78);
  --glass-border: rgba(0, 0, 0, 0.06);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  --radius: 14px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: var(--font);
  background: #fff;
  overflow: hidden;
  color: #111;
}

#divusion {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  cursor: default;
}

/* ─── Top Bar ─── */

#topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  pointer-events: none;
}

#topbar > * {
  pointer-events: auto;
}

.topbar-left {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.logo {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: #000;
}

.tagline {
  font-size: 13px;
  font-weight: 400;
  color: #999;
}

.panel-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: #000;
  color: #fff;
  border: none;
  border-radius: 100px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.panel-toggle:hover {
  background: #222;
  transform: scale(1.03);
}

.panel-toggle:active {
  transform: scale(0.97);
}

/* ─── Side Panel ─── */

.panel {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 20;
  width: var(--panel-width);
  height: 100vh;
  padding: 36px 28px;
  background: var(--glass-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-left: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 18px;
  transform: translateX(100%);
  transition: transform var(--transition);
  overflow-y: auto;
}

.panel.open {
  transform: translateX(0);
}

.panel-close {
  position: absolute;
  top: 16px;
  right: 20px;
  background: none;
  border: none;
  font-size: 28px;
  color: #888;
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition);
}

.panel-close:hover {
  color: #000;
}

.panel h2 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-top: 12px;
}

.panel-desc {
  font-size: 14px;
  color: #666;
  line-height: 1.5;
}

.panel label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #888;
  margin-top: 4px;
}

.input-row {
  display: flex;
  align-items: center;
  border: 1px solid #ddd;
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  transition: border-color var(--transition);
}

.input-row:focus-within {
  border-color: #000;
}

.at-prefix {
  padding: 0 0 0 14px;
  font-size: 15px;
  color: #aaa;
  user-select: none;
}

.input-row input {
  flex: 1;
  border: none;
  outline: none;
  padding: 12px 14px 12px 4px;
  font-size: 15px;
  font-family: var(--font);
  background: transparent;
}

.avatar-preview {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: #f6f6f6;
  border-radius: var(--radius);
  transition: opacity var(--transition);
}

.avatar-preview.hidden {
  display: none;
}

.avatar-preview img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.avatar-preview span {
  font-size: 14px;
  font-weight: 500;
  color: #333;
}

select {
  width: 100%;
  padding: 12px 14px;
  font-size: 15px;
  font-family: var(--font);
  border: 1px solid #ddd;
  border-radius: var(--radius);
  background: #fff;
  color: #111;
  cursor: pointer;
  outline: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%23999' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  transition: border-color var(--transition);
}

select:focus {
  border-color: #000;
}


.btn-primary {
  width: 100%;
  padding: 14px;
  background: #000;
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  margin-top: 6px;
}

.btn-primary:hover {
  background: #222;
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  background: #ccc;
  cursor: not-allowed;
  transform: none;
}

.error-msg {
  font-size: 13px;
  color: #d44;
  background: #fff0f0;
  padding: 10px 14px;
  border-radius: 10px;
}

.error-msg.hidden {
  display: none;
}

.loading-msg {
  font-size: 13px;
  color: #666;
  text-align: center;
  padding: 8px 0;
}

.loading-msg.hidden {
  display: none;
}

/* ─── Toast ─── */

.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  z-index: 30;
  padding: 12px 24px;
  background: #000;
  color: #fff;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  border-radius: 100px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.15);
  opacity: 0;
  transition: opacity 0.4s, transform 0.4s;
  pointer-events: none;
}

.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast.hidden {
  display: block;
}

/* ─── Responsive ─── */

@media (max-width: 480px) {
  .panel {
    width: 100vw;
  }

  .tagline {
    display: none;
  }

  #topbar {
    padding: 12px 16px;
  }

  .panel-toggle {
    padding: 8px 16px;
    font-size: 13px;
  }
}