@charset "utf-8";

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

:root {
  --primary:       #7c3aed;
  --primary-dark:  #6d28d9;
  --accent:        #f59e0b;
  --text:          #111827;
  --text-muted:    #6b7280;
  --border:        #e5e7eb;
  --bg:            #f9fafb;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* NAV */
.nav {
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 40px;
  height: 64px;
  display: flex;
  align-items: center;
}
.nav-logo {
  font-size: 20px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.04em;
  text-decoration: none;
}
.nav-logo span { color: var(--accent); }

/* MAIN */
.main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
}

/* CARD */
.login-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px 44px;
  width: 100%;
  max-width: 440px;
  box-shadow: 0 8px 32px rgba(124,58,237,0.08);
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-logo {
  font-size: 24px;
  font-weight: 900;
  color: var(--primary);
  letter-spacing: -0.04em;
  margin-bottom: 8px;
}
.login-logo span { color: var(--accent); }

.login-title {
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 4px;
}

.login-subtitle {
  font-size: 14px;
  color: var(--text-muted);
}

/* ERROR */
.error-box {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #991b1b;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 20px;
}

/* FIELD */
.field { margin-bottom: 18px; }

.field label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.field input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  font-family: inherit;
  color: var(--text);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.field input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(124,58,237,.12);
}

/* SUBMIT */
.btn-login {
  width: 100%;
  padding: 13px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  margin-top: 8px;
}
.btn-login:hover { background: var(--primary-dark); }
.btn-login:active { transform: scale(0.99); }

/* BACK */
.back-link {
  display: block;
  text-align: center;
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s;
}
.back-link:hover { color: var(--text); }