* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #0a0a2e 0%, #1a1a4e 30%, #0d0d3d 60%, #0a0a2e 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
}
.bg-particles {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none; z-index: 0;
}
.particle {
    position: absolute;
    background: radial-gradient(circle, rgba(100, 180, 255, 0.6), transparent);
    border-radius: 50%;
    animation: floatUp linear infinite;
}
@keyframes floatUp {
    0% { transform: translateY(100vh) scale(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-10vh) scale(1); opacity: 0; }
}
.container {
    position: relative; z-index: 1;
    width: 100%; max-width: 420px; padding: 20px;
}
.lang-switch {
    position: absolute; top: 20px; right: 20px; z-index: 10;
}
.lang-btn {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: #fff; padding: 8px 16px; border-radius: 20px;
    cursor: pointer; font-size: 14px; transition: all 0.3s;
    backdrop-filter: blur(10px);
}
.lang-btn:hover { background: rgba(255,255,255,0.2); }
.lang-dropdown {
    display: none; position: absolute; top: 100%; right: 0; margin-top: 8px;
    background: rgba(20,20,60,0.95); border: 1px solid rgba(255,255,255,0.2);
    border-radius: 12px; overflow: hidden; min-width: 140px;
    backdrop-filter: blur(20px);
}
.lang-dropdown.show { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
.lang-dropdown a {
    display: block; padding: 12px 20px; color: #ccc; text-decoration: none;
    font-size: 14px; transition: all 0.2s;
}
.lang-dropdown a:hover { background: rgba(100,180,255,0.2); color: #fff; }
.lang-dropdown a.active { color: #64b4ff; background: rgba(100,180,255,0.15); }
.card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 24px; padding: 40px 30px;
    backdrop-filter: blur(20px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    animation: slideUp 0.6s ease;
}
@keyframes slideUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
.logo-area { text-align: center; margin-bottom: 30px; }
.logo-area img { max-width: 180px; height: auto; }
.logo-area .logo-text {
    font-size: 28px; font-weight: 700; color: #fff;
    background: linear-gradient(135deg, #64b4ff, #a78bfa);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.form-group { margin-bottom: 20px; position: relative; }
.form-group label {
    display: block; color: rgba(255,255,255,0.7); font-size: 13px;
    margin-bottom: 8px; font-weight: 500;
}
.form-group input {
    width: 100%; padding: 14px 16px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 12px; color: #fff; font-size: 15px;
    transition: all 0.3s; outline: none;
}
.form-group input:focus {
    border-color: #64b4ff;
    box-shadow: 0 0 20px rgba(100,180,255,0.2);
    background: rgba(255,255,255,0.12);
}
.form-group input::placeholder { color: rgba(255,255,255,0.3); }
.btn-primary {
    width: 100%; padding: 14px;
    background: linear-gradient(135deg, #4a90d9, #6c5ce7);
    border: none; border-radius: 12px; color: #fff;
    font-size: 16px; font-weight: 600; cursor: pointer;
    transition: all 0.3s; position: relative; overflow: hidden;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(100,180,255,0.3);
}
.btn-primary:active { transform: translateY(0); }
.btn-primary.loading { pointer-events: none; opacity: 0.7; }
.btn-primary .spinner {
    display: none; width: 20px; height: 20px; border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff; border-radius: 50%; animation: spin 0.6s linear infinite;
    position: absolute; top: 50%; left: 50%; margin: -10px 0 0 -10px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.btn-primary.loading .btn-text { visibility: hidden; }
.btn-primary.loading .spinner { display: block; }
.links { text-align: center; margin-top: 20px; }
.links a { color: rgba(255,255,255,0.6); text-decoration: none; font-size: 14px; transition: color 0.3s; }
.links a:hover { color: #64b4ff; }
.toast {
    position: fixed; top: 20px; left: 50%; transform: translateX(-50%);
    padding: 12px 24px; border-radius: 12px; color: #fff; font-size: 14px;
    z-index: 1000; animation: toastIn 0.3s ease;
    backdrop-filter: blur(10px);
}
.toast.error { background: rgba(255,80,80,0.9); }
.toast.success { background: rgba(80,200,120,0.9); }
@keyframes toastIn { from { opacity: 0; transform: translateX(-50%) translateY(-20px); } to { opacity: 1; transform: translateX(-50%) translateY(0); } }
@media (max-width: 480px) {
    .card { padding: 30px 20px; border-radius: 20px; }
    .container { padding: 15px; }
}